Financial Derivative Instruments - Schedule of Offsetting Derivative Liabilities (Details) - Fuel derivative contracts - USD ($) $ in Millions |
Sep. 30, 2025 |
Dec. 31, 2024 |
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| Prepaid expenses and other current assets | ||
| Offsetting Liabilities [Line Items] | ||
| Gross amounts of recognized liabilities | $ 0 | $ 4 |
| Gross amounts offset in the Balance Sheet | 0 | (4) |
| Net amounts of liabilities presented in the Balance Sheet | 0 | 0 |
| Other assets | ||
| Offsetting Liabilities [Line Items] | ||
| Gross amounts of recognized liabilities | 0 | 18 |
| Gross amounts offset in the Balance Sheet | 0 | (18) |
| Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0 |
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value, after effect of master netting arrangement, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative subject to master netting arrangement not elected or qualified to offset. Excludes derivative not subject to master netting arrangement or similar agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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