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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Liabilities |  |
Gross amounts offset in the balance sheet | $ 106 | $ 80
Gross amounts offset in the Balance Sheet | (106) | (80)
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
Derivative Liability, 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 |  |
Gross amounts offset in the balance sheet | $ 0 | $ 95
Gross amounts offset in the Balance Sheet | 0 | (95)
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Interest rate derivatives |  |
Offsetting Liabilities |  |
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 4
Interest rate derivatives | Other noncurrent liabilities |  |
Offsetting Liabilities |  |
Gross amounts offset in the balance sheet | 0 | 4
Gross amounts offset in the Balance Sheet | $ 0 | $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities

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