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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | $ 14 | $ 0
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 27 | 15
Gross amounts offset in the Balance Sheet | (27) | (15)
Net amounts of liabilities presented in the Balance Sheet | 0 | 0
Fuel derivative contracts | Other assets |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 17 | 35
Gross amounts offset in the Balance Sheet | (17) | (35)
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0

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