2.4.1.9 Html 144 241 1 true 47 0 false 4 false false R1.htm 0001000 - Document - Document And Entity Information Sheet http://www.columbiapipelinegroup.com/role/DocumentAndEntityInformation Document And Entity Information true false R2.htm 1001000 - Statement - Statements of Consolidated and Combined Balance Sheets Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedBalanceSheets Statements of Consolidated and Combined Balance Sheets false false R3.htm 1001501 - Statement - Statements of Consolidated and Combined Balance Sheets (Parenthetical) Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedBalanceSheetsParenthetical Statements of Consolidated and Combined Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Statements Of Consolidated and Combined Operations Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedOperations Statements Of Consolidated and Combined Operations false false R5.htm 1003000 - Statement - Statements of Consolidated and Combined Comprehensive Income Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedComprehensiveIncome Statements of Consolidated and Combined Comprehensive Income false false R6.htm 1003501 - Statement - Statements of Consolidated and Combined Comprehensive Income (Parenthetical) Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedComprehensiveIncomeParenthetical Statements of Consolidated and Combined Comprehensive Income (Parenthetical) false false R7.htm 1004000 - Statement - Statements Of Consolidated and Combined Cash Flows Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedCashFlows Statements Of Consolidated and Combined Cash Flows false false R8.htm 1005000 - Statement - Statements Of Consolidated and Combined Equity and Partners' Capital Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedEquityAndPartnersCapital Statements Of Consolidated and Combined Equity and Partners' Capital false false R9.htm 1005501 - Statement - Statements Of Consolidated and Combined Equity and Partners' Capital Statement of Consolidated and Combined Equity and Partners' Capital (Parenthetical) Sheet http://www.columbiapipelinegroup.com/role/StatementsOfConsolidatedAndCombinedEquityAndPartnersCapitalStatementOfConsolidatedAndCombinedEquityAndPartnersCapitalParenthetical Statements Of Consolidated and Combined Equity and Partners' Capital Statement of Consolidated and Combined Equity and Partners' Capital (Parenthetical) false false R10.htm 2104100 - Disclosure - Basis of Accounting Presentation Sheet http://www.columbiapipelinegroup.com/role/BasisOfAccountingPresentation Basis of Accounting Presentation false false R11.htm 2105100 - Disclosure - Initial Public Offering Initial Public Offering Sheet http://www.columbiapipelinegroup.com/role/InitialPublicOfferingInitialPublicOffering Initial Public Offering Initial Public Offering false false R12.htm 2106100 - Disclosure - Recent Accounting Pronouncements Sheet http://www.columbiapipelinegroup.com/role/RecentAccountingPronouncements Recent Accounting Pronouncements false false R13.htm 2107100 - Disclosure - Net Income Per Limited Partner Unit Sheet http://www.columbiapipelinegroup.com/role/NetIncomePerLimitedPartnerUnit Net Income Per Limited Partner Unit false false R14.htm 2108100 - Disclosure - Transactions With Affiliates Sheet http://www.columbiapipelinegroup.com/role/TransactionsWithAffiliates Transactions With Affiliates false false R15.htm 2109100 - Disclosure - Short-Term Borrowings Sheet http://www.columbiapipelinegroup.com/role/ShortTermBorrowings Short-Term Borrowings false false R16.htm 2110100 - Disclosure - Gain On Sale Of Assets Sheet http://www.columbiapipelinegroup.com/role/GainOnSaleOfAssets Gain On Sale Of Assets false false R17.htm 2111100 - Disclosure - Goodwill Sheet http://www.columbiapipelinegroup.com/role/Goodwill Goodwill false false R18.htm 2112100 - Disclosure - Asset Retirement Obligations Sheet http://www.columbiapipelinegroup.com/role/AssetRetirementObligations Asset Retirement Obligations false false R19.htm 2113100 - Disclosure - Regulatory Matters Sheet http://www.columbiapipelinegroup.com/role/RegulatoryMatters Regulatory Matters false false R20.htm 2114100 - Disclosure - Equity Method Investments Sheet http://www.columbiapipelinegroup.com/role/EquityMethodInvestments Equity Method Investments false false R21.htm 2115100 - Disclosure - Income Taxes Sheet http://www.columbiapipelinegroup.com/role/IncomeTaxes Income Taxes false false R22.htm 2116100 - Disclosure - Pension And Other Postretirement Benefits Sheet http://www.columbiapipelinegroup.com/role/PensionAndOtherPostretirementBenefits Pension And Other Postretirement Benefits false false R23.htm 2117100 - Disclosure - Fair Value Sheet http://www.columbiapipelinegroup.com/role/FairValue Fair Value false false R24.htm 2118100 - Disclosure - Other Commitments And Contingencies Sheet http://www.columbiapipelinegroup.com/role/OtherCommitmentsAndContingencies Other Commitments And Contingencies false false R25.htm 2119100 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.columbiapipelinegroup.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss false false R26.htm 2121100 - Disclosure - Other, Net Sheet http://www.columbiapipelinegroup.com/role/OtherNet Other, Net false false R27.htm 2122100 - Disclosure - Supplemental Cash Flow Information Sheet http://www.columbiapipelinegroup.com/role/SupplementalCashFlowInformation Supplemental Cash Flow Information false false R28.htm 2123100 - Disclosure - Concentration Of Credit Risk Sheet http://www.columbiapipelinegroup.com/role/ConcentrationOfCreditRisk Concentration Of Credit Risk false false R29.htm 2124100 - Disclosure - Subsequent Event Sheet http://www.columbiapipelinegroup.com/role/SubsequentEvent Subsequent Event false false R30.htm 2305301 - Disclosure - Initial Public Offering (Tables) Sheet http://www.columbiapipelinegroup.com/role/InitialPublicOfferingTables Initial Public Offering (Tables) false false R31.htm 2307301 - Disclosure - Net Income Per Limited Partner Unit (Tables) Sheet http://www.columbiapipelinegroup.com/role/NetIncomePerLimitedPartnerUnitTables Net Income Per Limited Partner Unit (Tables) false false R32.htm 2308301 - Disclosure - Transactions With Affiliates (Tables) Sheet http://www.columbiapipelinegroup.com/role/TransactionsWithAffiliatesTables Transactions With Affiliates (Tables) false false R33.htm 2312301 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://www.columbiapipelinegroup.com/role/AssetRetirementObligationsTables Asset Retirement Obligations (Tables) false false R34.htm 2316301 - Disclosure - Pension And Other Postretirement Benefits (Tables) Sheet http://www.columbiapipelinegroup.com/role/PensionAndOtherPostretirementBenefitsTables Pension And Other Postretirement Benefits (Tables) false false R35.htm 2317301 - Disclosure - Fair Value (Tables) Sheet http://www.columbiapipelinegroup.com/role/FairValueTables Fair Value (Tables) false false R36.htm 2319301 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.columbiapipelinegroup.com/role/AccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) false false R37.htm 2321301 - Disclosure - Other, Net (Tables) Sheet http://www.columbiapipelinegroup.com/role/OtherNetTables Other, Net (Tables) false false R38.htm 2322301 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://www.columbiapipelinegroup.com/role/SupplementalCashFlowInformationTables Supplemental Cash Flow Information (Tables) false false R39.htm 2323301 - Disclosure - Concentration Of Credit Risk (Tables) Sheet http://www.columbiapipelinegroup.com/role/ConcentrationOfCreditRiskTables Concentration Of Credit Risk (Tables) false false R40.htm 2404401 - Disclosure - Basis of Accounting Presentation Basis of Accounting Presentation (Details) Sheet http://www.columbiapipelinegroup.com/role/BasisOfAccountingPresentationBasisOfAccountingPresentationDetails Basis of Accounting Presentation Basis of Accounting Presentation (Details) false false R41.htm 2405402 - Disclosure - Initial Public Offering (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/InitialPublicOfferingNarrativeDetails Initial Public Offering (Narrative) (Details) false false R42.htm 2405403 - Disclosure - Initial Public Offering (Schedule of Change From Net Income Attributable to the Partnership and Transfers to Noncontrolling Interest) (Details) Sheet http://www.columbiapipelinegroup.com/role/InitialPublicOfferingScheduleOfChangeFromNetIncomeAttributableToPartnershipAndTransfersToNoncontrollingInterestDetails Initial Public Offering (Schedule of Change From Net Income Attributable to the Partnership and Transfers to Noncontrolling Interest) (Details) false false R43.htm 2407402 - Disclosure - Net Income Per Limited Partner Unit (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/NetIncomePerLimitedPartnerUnitNarrativeDetails Net Income Per Limited Partner Unit (Narrative) (Details) false false R44.htm 2407403 - Disclosure - Net Income Per Limited Partner Unit (Schedule of Net Income In Excess Of Distribution) (Details) Sheet http://www.columbiapipelinegroup.com/role/NetIncomePerLimitedPartnerUnitScheduleOfNetIncomeInExcessOfDistributionDetails Net Income Per Limited Partner Unit (Schedule of Net Income In Excess Of Distribution) (Details) false false R45.htm 2407404 - Disclosure - Net Income Per Limited Partner Unit (Schedule of Net Income Per Limited Partner Unit) (Details) Sheet http://www.columbiapipelinegroup.com/role/NetIncomePerLimitedPartnerUnitScheduleOfNetIncomePerLimitedPartnerUnitDetails Net Income Per Limited Partner Unit (Schedule of Net Income Per Limited Partner Unit) (Details) false false R46.htm 2408402 - Disclosure - Transactions With Affiliates (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/TransactionsWithAffiliatesNarrativeDetails Transactions With Affiliates (Narrative) (Details) false false R47.htm 2408403 - Disclosure - Transactions With Affiliates (Schedule of Affiliated Transactions) (Details) Sheet http://www.columbiapipelinegroup.com/role/TransactionsWithAffiliatesScheduleOfAffiliatedTransactionsDetails Transactions With Affiliates (Schedule of Affiliated Transactions) (Details) false false R48.htm 2408404 - Disclosure - Transactions With Affiliates (Schedule of Long-term Debt) (Details) Sheet http://www.columbiapipelinegroup.com/role/TransactionsWithAffiliatesScheduleOfLongTermDebtDetails Transactions With Affiliates (Schedule of Long-term Debt) (Details) false false R49.htm 2409401 - Disclosure - Short-Term Borrowings (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/ShortTermBorrowingsNarrativeDetails Short-Term Borrowings (Narrative) (Details) false false R50.htm 2410401 - Disclosure - Gain On Sale Of Assets (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/GainOnSaleOfAssetsNarrativeDetails Gain On Sale Of Assets (Narrative) (Details) false false R51.htm 2412402 - Disclosure - Asset Retirement Obligations (Changes In Company's Liability For Asset Retirement Obligations) (Details) Sheet http://www.columbiapipelinegroup.com/role/AssetRetirementObligationsChangesInCompanysLiabilityForAssetRetirementObligationsDetails Asset Retirement Obligations (Changes In Company's Liability For Asset Retirement Obligations) (Details) false false R52.htm 2413401 - Disclosure - Regulatory Matters (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/RegulatoryMattersNarrativeDetails Regulatory Matters (Narrative) (Details) false false R53.htm 2414401 - Disclosure - Equity Method Investments (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/EquityMethodInvestmentsNarrativeDetails Equity Method Investments (Narrative) (Details) false false R54.htm 2415401 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) false false R55.htm 2416402 - Disclosure - Pension And Other Postretirement Benefits (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/PensionAndOtherPostretirementBenefitsNarrativeDetails Pension And Other Postretirement Benefits (Narrative) (Details) false false R56.htm 2416403 - Disclosure - Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) Sheet http://www.columbiapipelinegroup.com/role/PensionAndOtherPostretirementBenefitsComponentsOfPlansNetPeriodicBenefitsCostDetails Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) false false R57.htm 2417402 - Disclosure - Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) Sheet http://www.columbiapipelinegroup.com/role/FairValueCarryingAmountAndEstimatedFairValuesOfFinancialInstrumentsDetails Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) false false R58.htm 2419402 - Disclosure - Accumulated Other Comprehensive Loss (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/AccumulatedOtherComprehensiveLossNarrativeDetails Accumulated Other Comprehensive Loss (Narrative) (Details) false false R59.htm 2419403 - Disclosure - Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) Sheet http://www.columbiapipelinegroup.com/role/AccumulatedOtherComprehensiveLossComponentsOfAccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) false false R60.htm 2421402 - Disclosure - Other, Net (Schedule of Other, Net) (Details) Sheet http://www.columbiapipelinegroup.com/role/OtherNetScheduleOfOtherNetDetails Other, Net (Schedule of Other, Net) (Details) false false R61.htm 2422402 - Disclosure - Supplemental Cash Flow Information (Details) Sheet http://www.columbiapipelinegroup.com/role/SupplementalCashFlowInformationDetails Supplemental Cash Flow Information (Details) false false R62.htm 2423402 - Disclosure - Concentration Of Credit Risk (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/ConcentrationOfCreditRiskNarrativeDetails Concentration Of Credit Risk (Narrative) (Details) false false R63.htm 2423403 - Disclosure - Concentration of Credit Risk (Schedule of Concentration Of Credit Risk) (Details) Sheet http://www.columbiapipelinegroup.com/role/ConcentrationOfCreditRiskScheduleOfConcentrationOfCreditRiskDetails Concentration of Credit Risk (Schedule of Concentration Of Credit Risk) (Details) false false R64.htm 2424401 - Disclosure - Subsequent Event (Narrative) (Details) Sheet http://www.columbiapipelinegroup.com/role/SubsequentEventNarrativeDetails Subsequent Event (Narrative) (Details) false false All Reports Book All Reports Element cppl_MarginRate had a mix of decimals attribute values: 4 5. Element us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity had a mix of decimals attribute values: -8 -6. Columns in Cash Flows statement 'Statements Of Consolidated and Combined Cash Flows (USD $)' have maximum duration 89 days and at least 79 values. Shorter duration columns must have at least one fourth (19) as many values. Column '12/31/2014' is shorter (-735597 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Statements Of Consolidated and Combined Cash Flows (USD $)' have maximum duration 89 days and at least 79 values. Shorter duration columns must have at least one fourth (19) as many values. Column '1/1/2015 - 2/11/2015' is shorter (41 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Statements Of Consolidated and Combined Cash Flows (USD $)' have maximum duration 89 days and at least 79 values. Shorter duration columns must have at least one fourth (19) as many values. Column '2/12/2015 - 3/31/2015' is shorter (47 days) and has only 2 values, so it is being removed. '' elements on report '2404401 - Disclosure - Basis of Accounting Presentation Basis of Accounting Presentation (Details)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Statements of Consolidated and Combined Balance Sheets Process Flow-Through: Removing column 'Feb. 11, 2015' Process Flow-Through: Removing column 'Mar. 31, 2014' Process Flow-Through: Removing column 'Dec. 31, 2013' Process Flow-Through: 1001501 - Statement - Statements of Consolidated and Combined Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Statements Of Consolidated and Combined Operations Process Flow-Through: Removing column '1 Months Ended Feb. 11, 2015' Process Flow-Through: 1003000 - Statement - Statements of Consolidated and Combined Comprehensive Income Process Flow-Through: Removing column '2 Months Ended Mar. 31, 2015' Process Flow-Through: Removing column '1 Months Ended Feb. 11, 2015' Process Flow-Through: 1003501 - Statement - Statements of Consolidated and Combined Comprehensive Income (Parenthetical) Process Flow-Through: 1004000 - Statement - Statements Of Consolidated and Combined Cash Flows Process Flow-Through: 1005501 - Statement - Statements Of Consolidated and Combined Equity and Partners' Capital Statement of Consolidated and Combined Equity and Partners' Capital (Parenthetical) cppl-20150331.xml cppl-20150331.xsd cppl-20150331_cal.xml cppl-20150331_def.xml cppl-20150331_lab.xml cppl-20150331_pre.xml true true