Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of information related to derivative contracts
The following table summarizes the risk hedged and the classification of related gains and losses in our income statement, by each type of derivative contract:
Derivative Type Hedged RiskClassification of Gains and Losses
Fuel hedge contractsFluctuations in fuel pricesAircraft fuel and related taxes
Interest rate contractsIncreases in interest ratesInterest expense, net
Foreign currency exchange contractsFluctuations in foreign currency exchange ratesPassenger revenue or non-operating expense (See Note 5)

The following table summarizes the accounting treatment of our derivative contracts:
Accounting DesignationImpact of Unrealized Gains and Losses
Not designated as hedges
Change in fair value(1) of hedge is recorded in earnings
Designated as cash flow hedgesMarket adjustments are recorded in AOCI
Designated as fair value hedgesMarket adjustments are recorded in debt and finance leases
(1)Including settled gains and losses as well as mark-to-market adjustments ("MTM adjustments").
Summary of property and equipment
The following table summarizes our property and equipment:
December 31,
(in millions, except for estimated useful life)Estimated Useful Life20192018
Flight equipment
20-34 years
$36,713  $33,898  
Ground property and equipment
3-40 years
5,721  4,667  
Information technology-related assets
3-15 years
3,276  3,361  
Flight and ground equipment under finance leasesShorter of lease term or estimated useful life1,608  1,055  
Advance payments for equipment1,019  1,177  
Less: accumulated depreciation and amortization(1)
(17,027) (15,823) 
Total property and equipment, net$31,310  $28,335  
(1)Includes accumulated amortization for flight and ground equipment under finance leases in the amount of $546 million and $566 million at December 31, 2019 and 2018, respectively.