2.2.0.7 true CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (USD $) 00300 - Statement - CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS true false In Millions false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Cash flows provided (used) by operating activities: 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 3 Net income (loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 578000000 578 false false false 2 true true false false -411000000 -411 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 4 Adjustments to reconcile to net cash provided (used) by operating activities - 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 5 Increase in advance ticket sales 2 uaua_IncreaseOrDecreaseInAirTrafficLiability uaua false debit duration The net change during the reporting period in the amount of unearned revenue by an airline industry company. This unearned... false false false false false false false false false false false terselabel false 1 false true false false 499000000 499 false false false 2 false true false false 145000000 145 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the amount of unearned revenue by an airline industry company. This unearned revenue includes tickets sold but not yet recognized as revenue (which occurs when transportation is provided or the ticket expires). No authoritative reference available. false 6 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 652000000 652 false false false 2 false true false false 675000000 675 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. 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Includes ineffectiveness on cash flow hedges, and change in receivable/payable from/to counterparties for contracts that have settled. No authoritative reference available. false 8 Asset impairments and special items 2 uaua_IncreaseDecreaseRestructuringAndOther uaua false debit duration Adjustment to remove noncash portion of restructuring and other costs when calculating cash flows from operations using the... false false false false false false false false false false false verboselabel false 1 false true false false 112000000 112 false false false 2 false true false false 250000000 250 false false false xbrli:monetaryItemType monetary Adjustment to remove noncash portion of restructuring and other costs when calculating cash flows from operations using the indirect method. No authoritative reference available. false 9 Increase (decrease) in Mileage Plus deferred revenue and advanced purchase of miles 2 uaua_IncreaseDecreaseFrequentFlierLiability uaua false debit duration The net change during the reporting period in the amount of an airline's obligation for its frequent flyer loyalty program. false false false false false false false false false false false terselabel false 1 false true false false -118000000 -118 false false false 2 false true false false 140000000 140 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the amount of an airline's obligation for its frequent flyer loyalty program. No authoritative reference available. false 10 Decrease in fuel hedge collateral 2 uaua_CashCollateralReceivedFromProvidedToCounterparties uaua false credit duration The amount of net cash provided or used during the reporting period for cash held either as collateral directly or provided... false false false false false false false false false false false terselabel false 1 false true false false 10000000 10 false false false 2 false true false false 903000000 903 false false false xbrli:monetaryItemType monetary The amount of net cash provided or used during the reporting period for cash held either as collateral directly or provided to third parties associated with derivative instruments. Upon the occurrence of any specified triggering event or condition associated with the derivative, these amounts can be utilized to recover all or a portion of the amounts due or payable under the derivative. No authoritative reference available. false 11 Increase in receivables 2 us-gaap_IncreaseDecreaseInReceivables us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -273000000 -273 false false false 2 false true false false -44000000 -44 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 12 Proceeds from lease amendment 2 uaua_ProceedsFromLessorIncentive uaua false credit duration This item represents the proceeds from inducement received by a lessee from a lessor, in order to motivate the lessee to... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 160000000 160 false false false xbrli:monetaryItemType monetary This item represents the proceeds from inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term No authoritative reference available. false 13 Other, net 2 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 371000000 371 false false false 2 false true false false -70000000 -70 false false false xbrli:monetaryItemType monetary Transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income and thus are removed when calculating net cash flow from operating activities using the indirect cash flow method. This element is used when there is not a more specific and appropriate element. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 14 Net cash provided (used) by operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1801000000 1801 false false false 2 false true false false 878000000 878 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 15 Cash flows provided (used) by investing activities: 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 16 Additions to property, equipment and deferred software 2 us-gaap_PaymentsToAcquireProductiveAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -212000000 -212 false false false 2 false true false false -230000000 -230 false false false xbrli:monetaryItemType monetary The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. 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No authoritative reference available. false 18 (Increase) decrease in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 71000000 71 false false false 2 false true false false -37000000 -37 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for the net change associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16, 17 false 19 Proceeds from asset dispositions 2 us-gaap_ProceedsFromSaleOfProductiveAssets us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 25000000 25 false false false 2 false true false false 77000000 77 false false false xbrli:monetaryItemType monetary The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c false 20 Proceeds from asset sale-leasebacks 2 uaua_ProceedsFromAssetSaleleaseBacks uaua false debit duration The gross proceeds received in a transaction involving the company's sale of property to another party and the immediate... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 135000000 135 false false false xbrli:monetaryItemType monetary The gross proceeds received in a transaction involving the company's sale of property to another party and the immediate "leaseback" of the property back from the buyer. No authoritative reference available. false 21 Other, net 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 6000000 6 false false false 2 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 false 22 Net cash provided (used) by investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -152000000 -152 false false false 2 false true false false -52000000 -52 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 23 Cash flows provided (used) by financing activities: 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 24 Proceeds from issuance of debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 1995000000 1995 false false false 2 false true false false 321000000 321 false false false xbrli:monetaryItemType monetary The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 25 Repayment of debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1529000000 -1529 false false false 2 false true false false -633000000 -633 false false false xbrli:monetaryItemType monetary The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 26 Principal payments under capital leases 2 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -201000000 -201 false false false 2 false true false false -129000000 -129 false false false xbrli:monetaryItemType monetary The cash outflow for the obligation for lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 false 27 Increase in deferred financing costs 2 us-gaap_PaymentsOfDebtIssuanceCosts us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -30000000 -30 false false false 2 false true false false -9000000 -9 false false false xbrli:monetaryItemType monetary The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 false 29 Proceeds from issuance of common stock 2 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 90000000 90 false false false xbrli:monetaryItemType monetary The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a false 30 Decrease in lease deposits 2 uaua_IncreaseDecreaseInLeaseDeposits uaua false debit duration The net cash inflow (outflow) for the net change in the beginning and end of period lease deposit balances. false false false false false false false false false false false terselabel false 1 false true false false 11000000 11 false false false 2 false true false false 22000000 22 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for the net change in the beginning and end of period lease deposit balances. No authoritative reference available. false 31 Other, net 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1000000 1 false false false 2 false true false false -2000000 -2 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 false 32 Net cash provided (used) by financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 247000000 247 false false false 2 false true false false -340000000 -340 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 33 Increase in cash and cash equivalents during the period 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1896000000 1896 false false false 2 false true false false 486000000 486 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 34 Cash and cash equivalents at beginning of the year 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 3042000000 3042 false false false 2 false true false false 2039000000 2039 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 35 Cash and cash equivalents at end of the period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 4938000000 4938 false false false 2 false true false false 2525000000 2525 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 36 United Air Lines Inc [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.united.com/role/statementcondensedstatementsofconsolidatedcashflowsunaudited false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 5 USD true false false false United Air Lines Inc [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi uaua_UnitedAirLinesIncMember dei_LegalEntityAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 6 USD true false false false United Air Lines Inc [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi uaua_UnitedAirLinesIncMember dei_LegalEntityAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false United Air Lines Inc [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi uaua_UnitedAirLinesIncMember dei_LegalEntityAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 8 USD true false false false United Air Lines Inc [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi uaua_UnitedAirLinesIncMember dei_LegalEntityAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 37 Cash flows provided (used) by operating activities: 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 38 Net income (loss) 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 606000000 606 false false false 2 false true false false -405000000 -405 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 39 Adjustments to reconcile to net cash provided (used) by operating activities - 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 40 Increase in advance ticket sales 2 uaua_IncreaseOrDecreaseInAirTrafficLiability uaua false debit duration The net change during the reporting period in the amount of unearned revenue by an airline industry company. This unearned... false false false false false false false false false false false terselabel false 1 false true false false 499000000 499 false false false 2 false true false false 145000000 145 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the amount of unearned revenue by an airline industry company. This unearned revenue includes tickets sold but not yet recognized as revenue (which occurs when transportation is provided or the ticket expires). No authoritative reference available. false 41 Depreciation and amortization 2 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 652000000 652 false false false 2 false true false false 675000000 675 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 42 Unrealized (gain)/loss on fuel derivatives and change in related pending settlements 2 uaua_UnrealizedGainLossOnHedgingInstrumentsAndRealizedGainLossOnPendingSettlements uaua false debit duration Amount of unrealized gain (loss) related to fuel derivative instruments, recorded in results of operations. Includes... false false false false false false false false false false false terselabel false 1 false true false false -30000000 -30 false false false 2 false true false false -870000000 -870 false false false xbrli:monetaryItemType monetary Amount of unrealized gain (loss) related to fuel derivative instruments, recorded in results of operations. Includes ineffectiveness on cash flow hedges, and change in receivable/payable from/to counterparties for contracts that have settled. No authoritative reference available. false 43 Asset impairments and special items 2 uaua_IncreaseDecreaseRestructuringAndOther uaua false debit duration Adjustment to remove noncash portion of restructuring and other costs when calculating cash flows from operations using the... false false false false false false false false false false false verboselabel false 1 false true false false 112000000 112 false false false 2 false true false false 250000000 250 false false false xbrli:monetaryItemType monetary Adjustment to remove noncash portion of restructuring and other costs when calculating cash flows from operations using the indirect method. No authoritative reference available. false 44 Increase (decrease) in Mileage Plus deferred revenue and advanced purchase of miles 2 uaua_IncreaseDecreaseFrequentFlierLiability uaua false debit duration The net change during the reporting period in the amount of an airline's obligation for its frequent flyer loyalty program. false false false false false false false false false false false terselabel false 1 false true false false -118000000 -118 false false false 2 false true false false 140000000 140 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the amount of an airline's obligation for its frequent flyer loyalty program. No authoritative reference available. false 45 Decrease in fuel hedge collateral 2 uaua_CashCollateralReceivedFromProvidedToCounterparties uaua false credit duration The amount of net cash provided or used during the reporting period for cash held either as collateral directly or provided... false false false false false false false false false false false terselabel false 1 false true false false 10000000 10 false false false 2 false true false false 903000000 903 false false false xbrli:monetaryItemType monetary The amount of net cash provided or used during the reporting period for cash held either as collateral directly or provided to third parties associated with derivative instruments. Upon the occurrence of any specified triggering event or condition associated with the derivative, these amounts can be utilized to recover all or a portion of the amounts due or payable under the derivative. No authoritative reference available. false 46 Increase in receivables 2 us-gaap_IncreaseDecreaseInReceivables us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -272000000 -272 false false false 2 false true false false -38000000 -38 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 47 Proceeds from lease amendment 2 uaua_ProceedsFromLessorIncentive uaua false credit duration This item represents the proceeds from inducement received by a lessee from a lessor, in order to motivate the lessee to... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 160000000 160 false false false xbrli:monetaryItemType monetary This item represents the proceeds from inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term No authoritative reference available. false 48 Other, net 2 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 338000000 338 false false false 2 false true false false -80000000 -80 false false false xbrli:monetaryItemType monetary Transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income and thus are removed when calculating net cash flow from operating activities using the indirect cash flow method. This element is used when there is not a more specific and appropriate element. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 49 Net cash provided (used) by operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1797000000 1797 false false false 2 false true false false 880000000 880 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 50 Cash flows provided (used) by investing activities: 2 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 51 Additions to property, equipment and deferred software 2 us-gaap_PaymentsToAcquireProductiveAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -212000000 -212 false false false 2 false true false false -230000000 -230 false false false xbrli:monetaryItemType monetary The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c false 52 Advance deposits on aircraft 2 uaua_IncreaseInAircraftDeposits uaua false debit duration Cash advanced to aircraft manufacturers for new flight equipment still under construction. false false false false false false false false false false false terselabel false 1 false true false false -42000000 -42 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Cash advanced to aircraft manufacturers for new flight equipment still under construction. No authoritative reference available. false 53 (Increase) decrease in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 71000000 71 false false false 2 false true false false -42000000 -42 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for the net change associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16, 17 false 54 Proceeds from asset dispositions 2 us-gaap_ProceedsFromSaleOfProductiveAssets us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 25000000 25 false false false 2 false true false false 77000000 77 false false false xbrli:monetaryItemType monetary The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c false 55 Proceeds from asset sale-leasebacks 2 uaua_ProceedsFromAssetSaleleaseBacks uaua false debit duration The gross proceeds received in a transaction involving the company's sale of property to another party and the immediate... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 135000000 135 false false false xbrli:monetaryItemType monetary The gross proceeds received in a transaction involving the company's sale of property to another party and the immediate "leaseback" of the property back from the buyer. No authoritative reference available. false 56 Other, net 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 6000000 6 false false false 2 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 false 57 Net cash provided (used) by investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -152000000 -152 false false false 2 false true false false -56000000 -56 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 58 Cash flows provided (used) by financing activities: 2 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 59 Proceeds from issuance of debt 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 1995000000 1995 false false false 2 false true false false 321000000 321 false false false xbrli:monetaryItemType monetary The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 60 Repayment of debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1528000000 -1528 false false false 2 false true false false -632000000 -632 false false false xbrli:monetaryItemType monetary The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 61 Principal payments under capital leases 2 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -201000000 -201 false false false 2 false true false false -129000000 -129 false false false xbrli:monetaryItemType monetary The cash outflow for the obligation for lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26, 31 false 62 Increase in deferred financing costs 2 us-gaap_PaymentsOfDebtIssuanceCosts us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -30000000 -30 false false false 2 false true false false -9000000 -9 false false false xbrli:monetaryItemType monetary The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 false 63 Capital contribution from parent 2 us-gaap_ProceedsFromContributionsFromParent us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 89000000 89 false false false xbrli:monetaryItemType monetary The cash inflow from parent as a source of financing that is recorded as additional paid in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 false 65 Decrease in lease deposits 2 uaua_IncreaseDecreaseInLeaseDeposits uaua false debit duration The net cash inflow (outflow) for the net change in the beginning and end of period lease deposit balances. false false false false false false false false false false false terselabel false 1 false true false false 11000000 11 false false false 2 false true false false 22000000 22 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for the net change in the beginning and end of period lease deposit balances. No authoritative reference available. false 66 Other, net 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4000000 4 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 false 67 Net cash provided (used) by financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 251000000 251 false false false 2 false true false false -338000000 -338 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 68 Increase in cash and cash equivalents during the period 2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1896000000 1896 false false false 2 false true false false 486000000 486 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 69 Cash and cash equivalents at beginning of the year 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 3036000000 3036 false false false 2 false true false false 2033000000 2033 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 70 Cash and cash equivalents at end of the period 2 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 true true false false 4932000000 4932 false false false 2 true true false false 2519000000 2519 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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