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Retirement and Deferred Compensation Plans (Benefit Plans' Assets and Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1,736 $ 1,589
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,670 1,520
Projected benefit obligation 1,698 1,646
Funded status (28) (126)
Amounts Recognized on the Consolidated Balance Sheets    
Other assets 88 12
Other liabilities (116) (138)
Net amount recognized $ (28) $ (126)
Weighted-Average Assumptions, Benefit obligations:    
Weighted-average discount rate 2.58% 3.14%
Weighted-Average Assumptions, Net periodic benefit cost:    
Weighted-average discount rate 3.12% 4.10%
Expected return on plan assets 6.10% 6.48%
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 66 $ 69
Projected benefit obligation 79 78
Funded status (13) (9)
Amounts Recognized on the Consolidated Balance Sheets    
Other liabilities (13) (9)
Net amount recognized $ (13) $ (9)
Weighted-Average Assumptions, Benefit obligations:    
Weighted-average discount rate 2.96% 3.50%
Weighted-Average Assumptions, Net periodic benefit cost:    
Weighted-average discount rate 3.50% 4.50%
Expected return on plan assets 6.50% 6.50%