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Fair Value Measurement - Fair Value Assets and Liabilities Measured on Recurring Basis with Unobservable Inputs (Details) - Fuel derivatives - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Losses for the period included in earnings [1] $ (23) $ (40)    
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset (Liability), Gain (Loss), OCI 1 (79)    
Purchases [2] 24 118    
Ending Balance 109 109    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     $ 107 $ 110
Commodity Option        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) [1] (21) (29)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI $ (1) $ (73)    
[1] Included in Other (gains) losses, net, within the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss).
[2] The purchase of fuel derivatives is recorded gross based on the structure of the derivative instrument and whether a contract with multiple derivatives was purchased as a single instrument or separate instruments.