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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
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	$ 116	$ 123
Corporate Bonds [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	49	12
U.S. Government Bonds [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	20	67
CMBS [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	2
Common Stock, [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	32
Cash And Invested Cash [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	5	36
Other Investments [Member]
Fair Value of Benefit Plans' Assets [Abstract]
Fair value of plan assets	$ 8	$ 8

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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