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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