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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Partners' Capital Notes [Abstract] |  |
Available-for-sale securities | $ 20 | $ 13
Foreign currency translation adjustment | (6) | (5)
Actuarial gain related to pensions and other postretirement benefits | 45 | 6
Investments in unconsolidated affiliates, net | 14 | 14
Total AOCI, net of tax | $ 73 | $ 28

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