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Stock-based Compensation (Schedule Of Compensation) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation, Before Tax: [Abstract] |  |  |  |
Stock options | $ 4 | $ 4 | $ 12 | $ 12
Retention awards | 16 | 13 | 50 | 45
Total stock-based compensation, before tax | 24 | 17 | 66 | 57
Excess tax benefits from equity compensation plans | 1 | $ 16 | 18 | $ 51
Employee Stock Purchase Program [Member] |  |  |  |
Stock-Based Compensation, Before Tax: [Abstract] |  |  |  |
ESPP | $ 4 |  | $ 4 |

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