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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | $ 23 | $ 0
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 50 | 106
Gross amounts offset in the Balance Sheet | (50) | (106)
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
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 Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | $ 33 | $ 0
Gross amounts offset in the Balance Sheet | (33) | 0
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets

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