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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - Fuel derivative contracts - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 0 | $ 22
Gross amounts offset in the Balance Sheet | 0 | (4)
Net amounts of assets presented in the Balance Sheet | 0 | 18
Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 0 | 108
Gross amounts offset in the Balance Sheet | 0 | (18)
Net amounts of assets presented in the Balance Sheet | $ 0 | $ 90

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