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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | $ 352 | $ 409
Gross amounts of recognized liabilities | 106 | 80
Gross amounts offset in the balance sheet | 106 | 80
Cash collateral deposits held from counterparties for fuel contracts - current | 106 | 80
Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 160 | 287
Gross amounts of recognized liabilities | 0 | 95
Gross amounts offset in the balance sheet | 0 | 95
Cash collateral deposits held from counterparties for fuel contracts - current | 0 | 95
Fuel derivative contracts | Accounts and other receivables |  |
Derivatives, Fair Value |  |
Receivable from third parties for fuel contracts | 34 | 8
Interest rate derivatives | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 14 | 0
Gross amounts of recognized liabilities | 0 | 0
Interest rate derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value |  |
Gross amounts offset in the balance sheet | 0 | 4
Designated as Hedging Instrument |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 526 | 696
Gross amounts offset in the balance sheet | 0 | 4
Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 352 | 409
Designated as Hedging Instrument | Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 160 | 287
Designated as Hedging Instrument | Interest rate derivatives | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 14 |
Gross amounts of recognized liabilities | 0 |
Designated as Hedging Instrument | Interest rate derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value |  |
Gross amounts offset in the balance sheet | $ 0 | $ 4

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