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Comprehensive Income - Schedule of AOCI Components (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | $ 10,417 | $ 10,414
Balance at end of period | 11,120 | 11,120
Accumulated other comprehensive income |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 891 | 388
Changes in fair value | 147 | 804
Reclassification to earnings | (233) | (387)
Balance at end of period | 805 | 805
Fuel and Interest Rate Derivatives | Fuel derivative contracts |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 1,141 | 492
Changes in fair value | 182 | 1,033
Reclassification to earnings | (306) | (508)
Balance at end of period | 1,017 | 1,017
Fuel and Interest Rate Derivatives | Interest rate derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (50) | (57)
Changes in fair value | 10 | 16
Reclassification to earnings | 2 | 3
Balance at end of period | (38) | (38)
Defined benefit plan items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | 66 | 66
Balance at end of period | 66 | 66
Deferred tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance at beginning of period | (266) | (113)
Changes in fair value | (45) | (245)
Reclassification to earnings | 71 | 118
Balance at end of period | $ (240) | $ (240)

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