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Financial Derivative Instruments - Premiums for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Designated as Hedging Instrument | Fuel and oil |  |  |  |
Derivative [Line Items] |  |  |  |
Premium expense (benefit) recognized in income on derivatives | $ 40 | $ 30 | $ 79 | $ 61
Not Designated as Hedging Instrument | Other (gains)/losses, net |  |  |  |
Derivative [Line Items] |  |  |  |
Premium expense (benefit) recognized in income on derivatives | $ (1) | $ 0 | $ (1) | $ 0

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