Retirement and Deferred Compensation Plans (Fair Value of Benefit Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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