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Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 8 $ 9 $ 12
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 3 0 0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities 0 0 (2)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 0 (1) (1)
Balance at end of year $ 11 $ 8 $ 9