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 |