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Retirement and Deferred Compensation Plans (Fair Value of Benefit Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | $ 1,197 | $ 1,734
Corporate bonds |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 292 | 452
U.S. government bonds |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 196 | 228
Foreign government bonds |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 128 | 191
State and municipal bonds |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 22 | 28
Limited Partnerships And Common And Preferred Stock [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 353 | 527
Bulk Annuity Insurance Policy [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 89 | 150
Cash and invested cash [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 46 | 91
Other Investments [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | $ 71 | $ 67

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