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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 280 | $ 223
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 132 | 86
Gross amounts offset in the Balance Sheet | (41) | (15)
Net amounts of assets presented in the Balance Sheet | $ 91 | $ 71
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets | Prepaid expenses and other current assets
Fuel derivative contracts | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 148 | $ 137
Gross amounts offset in the Balance Sheet | (32) | (35)
Net amounts of assets presented in the Balance Sheet | $ 116 | $ 102
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets

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