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Commitments and Contingencies - Environmental Liabilities (Details) - Excluding Line 901 Incident - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Loss Contingencies [Line Items] |  |
Estimated undiscounted reserve for environmental liabilities, short-term [Extensible Enumeration] | Other current liabilities | Other current liabilities
Estimated undiscounted reserve for environmental liabilities, short-term | $ 40 | $ 13
Estimated undiscounted reserve for environmental liabilities, long-term [Extensible Enumeration] | Other long-term liabilities and deferred credits | Other long-term liabilities and deferred credits
Estimated undiscounted reserve for environmental liabilities, long-term | $ 70 | $ 70
Estimated undiscounted reserve for environmental liabilities | $ 110 | $ 83

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