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Comprehensive Income (Loss) - Schedule of AOCI Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 8,876 | $ 9,832 | $ 9,853
Changes in fair value | 547 | (129) |
Reclassification to earnings | (34) | 85 |
Balance at end of period | $ 10,414 | 8,876 | $ 9,832
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2016-01 [Member] |  | Accounting Standards Update 2016-02 [Member]
Cumulative Effect, Period of Adoption, Adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 0 |  | $ 55
Balance at end of period |  | 0 |
Accumulated other comprehensive income (loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (105) | (61) | 20
Balance at end of period | 388 | (105) | (61)
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 | (20) |  |
Balance at end of period |  | (20) |
Fuel derivatives | Fuel derivative contracts |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (119) | (125) |
Changes in fair value | 601 | (103) |
Reclassification to earnings | 10 | 109 |
Balance at end of period | 492 | (119) | (125)
Fuel derivatives | Interest rate derivatives |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (66) | (33) |
Changes in fair value | 3 | (34) |
Reclassification to earnings | 6 | 1 |
Balance at end of period | (57) | (66) | (33)
Defined benefit plan items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (43) | 20 |
Changes in fair value | 109 | (63) |
Balance at end of period | 66 | (43) | 20
Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 91 | 59 |
Changes in fair value |  | 32 |
Balance at end of period | 0 | 91 | 59
Other | Cumulative Effect, Period of Adoption, Adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (31) |  |
Balance at end of period |  | (31) |
Other | Fuel derivative contracts |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Reclassification to earnings | (60) |  |
Deferred tax impact |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 32 | 18 |
Changes in fair value | (166) | 39 |
Reclassification to earnings | 10 | (25) |
Balance at end of period | (113) | 32 | $ 18
Deferred tax impact | Cumulative Effect, Period of Adoption, Adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 11 |  |
Balance at end of period |  | $ 11 |

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