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Retirement and Deferred Compensation Plans (Fair Value of Benefit Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | $ 1,734 | $ 1,736
Corporate Bonds [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 452 | 320
U.S. Government Bonds [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 228 | 246
Foreign Government Bonds [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 191 | 138
State And Municipal Bonds [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 28 | 29
Limited Partnerships And Common And Preferred Stock [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 527 | 671
Bulk Annuity Insurance Policy [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 150 | 178
Invested Cash [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | 91 | 88
Other Investments [Member] |  |
Fair Value of Benefit Plans' Assets [Abstract] |  |
Fair value of plan assets | $ 67 | $ 66

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