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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 228 | $ 352
Gross amounts offset in the Balance Sheet | (65) | (106)
Net amounts of assets presented in the Balance Sheet | $ 163 | $ 246
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 | $ 167 | $ 160
Gross amounts offset in the Balance Sheet | (11) | 0
Net amounts of assets presented in the Balance Sheet | $ 156 | $ 160
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Interest rate derivative contracts |  |
Offsetting Assets [Line Items] |  |
Net amounts of assets presented in the Balance Sheet | $ 13 | $ 14
Interest rate derivative contracts | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 13 | 14
Gross amounts offset in the Balance Sheet | $ 0 | $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets

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