Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] | ||||||
| Capitalized repair and maintenance costs | $ 181 | $ 235 | ||||
| Pension assets | [1] | 140 | 142 | |||
| Deferred income taxes | 46 | 254 | ||||
| Miscellaneous | [2] | 121 | 120 | |||
| Total other assets | $ 488 | $ 751 | ||||
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| X | ||||||||||
- Definition Capitalized repair and maintenance costs. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other assets expected to be realized or consumed after one year or normal operating cycle, if longer. No definition available.
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| X | ||||||||||
- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. No definition available.
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| X | ||||||||||
- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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