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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Partners' Capital Notes [Abstract] |  |
Available-for-sale securities | $ 13 | $ 9
Foreign currency translation adjustment | (5) | 1
Actuarial gain (loss) related to pensions and other postretirement benefits | 6 | (7)
Investments in unconsolidated affiliates, net | 14 | 13
Total AOCI, net of tax | $ 28 | $ 16

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