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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 9 $ 12 $ 37
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0 0 2
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions 0 0 (25)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities 0 (2) (1)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations (1) (1) (1)
Balance at end of year $ 8 $ 9 $ 12