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Income Tax Expense (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense at United States statutory rate $ 90 $ 105 $ 116
Partnership earnings not subject to tax (64) (74) (96)
State and local tax, including federal expense 10 1 7
Other 0 (6) 3
Income tax expense $ 36 $ 26 $ 30