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Financial Derivative Instruments - Premiums for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Designated as Hedging Instrument | Fuel and oil |  |  |
Derivative [Line Items] |  |  |
Premium expense recognized in income on derivatives | $ 57 | $ 64 | $ 95
Not Designated as Hedging Instrument, Economic Hedge | Other (gains)/losses, net |  |  |
Derivative [Line Items] |  |  |
Premium expense recognized in income on derivatives | $ 43 | $ 34 | $ 0

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- Definition The premium (cost) of a hedge, expensed during the period. + References No definition available. + Details
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