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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 234 | $ 223
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 95 | 86
Gross amounts offset in the Balance Sheet | (27) | (15)
Net amounts of assets presented in the Balance Sheet | 68 | 71
Fuel derivative contracts | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 139 | 137
Gross amounts offset in the Balance Sheet | (17) | (35)
Net amounts of assets presented in the Balance Sheet | $ 122 | $ 102

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