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Fair Value Measurement - Fair Value Assets and Liabilities Measured on Recurring Basis with Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total losses (realized or unrealized) included in other comprehensive income (loss)   $ (112)
Fuel derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   138
Losses for the period included in earnings [1] $ (40)  
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset (Liability), Gain (Loss), OCI (65)  
Purchases 129 [2] 133 [3]
Sales [3]   (2)
Settlements   (47)
Ending Balance 134 $ 110
Fuel derivatives | Commodity Option [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020 [1] (15)  
The amount of total losses for the period included in other comprehensive loss attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2020 $ (41)  
[1] Included in Other (gains) losses, net, within the 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.
[3] The purchase and sale of fuel derivatives are 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.