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Comprehensive Income (Loss) - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 9,688 $ 8,876 $ 8,876
Changes in fair value 129   407
Reclassification to earnings 2   (16)
Balance at end of period 10,250 $ 9,093 $ 10,250
Accounting Standards Update [Extensible Enumeration]   Accounting Standards Update 2016-01 Accounting Standards Update 2016-01
Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   $ 0 $ 0
Accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 136 (105) (105)
Balance at end of period 267 (60) 267
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   (19) (19)
Fuel and Interest Rate Derivatives | Fuel derivative contracts      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 274 (119) (119)
Changes in fair value 166   525
Reclassification to earnings 2   36
Balance at end of period 442   442
Fuel and Interest Rate Derivatives | Interest rate derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (59) (66) (66)
Changes in fair value 2   6
Reclassification to earnings 1   4
Balance at end of period (56)   (56)
Defined benefit plan items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (43) (43) (43)
Balance at end of period (43)   (43)
Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   91 91
Reclassification to earnings     (60)
Balance at end of period 0   0
Other | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   (31) (31)
Deferred tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (36) 32 32
Changes in fair value (39)   (124)
Reclassification to earnings (1)   4
Balance at end of period $ (76)   (76)
Deferred tax | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   $ 12 $ 12