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Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Actuarial (gain) loss $ (84) $ 205  
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 61    
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets $ 0    
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Future capital call commitments for limited partnership investments $ 160    
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 32.00% 51.00%  
Defined contribution plan, maximum annual contributions per employee, percent 50.00%    
Defined contribution plan, employer matching contribution, percent of match 100.00%    
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%    
Company contribution of eligible compensation, depending on age, percent 5.00%    
Defined contribution plan, employers matching contribution, vesting period in years 5 years    
Benefit expense for the Company's savings plan $ 65 $ 70 $ 71
Pension Benefits      
Defined benefit plan, accumulated benefit obligation 2,561 2,769  
Actuarial (gain) loss $ (84) $ 205  
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 65.00% 75.00%  
Limited partnership equity related hedge fund strategy plan assets 76.00%    
Limited partnership hedge fund multi strategy plan assets 19.00%    
Limited partnership hedge fund strategy distressed investments plan assets 5.00%    
Defined benefit plan, expected future employer contributions, next fiscal year $ 5    
Postretirement Benefits      
Actuarial (gain) loss $ 1 $ 2  
Defined benefit plan, health care cost trend rate assumed for next fiscal year 4.00% 4.00% 4.00%
Defined benefit plan, expected future employer contributions, next fiscal year $ 1    
Minimum      
Defined benefit plan, plan assets, target allocation, percentage 40.00%    
Maximum      
Defined benefit plan, plan assets, target allocation, percentage 60.00%