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Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Actuarial (gain) loss $ (514) $ (84)  
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 49 $ 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 $ 120    
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 24.00% 32.00%  
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 $ 71 $ 65 $ 70
Pension Benefits      
Defined benefit plan, accumulated benefit obligation 1,931 2,561  
Actuarial (gain) loss $ (514) $ (84)  
Percentage of limited partnerships invested in private debt and equity 62.00% 35.00%  
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 38.00% 65.00%  
Defined benefit plan, expected future employer contributions, next fiscal year $ 6    
Postretirement Benefits      
Actuarial (gain) loss $ 0 $ 1  
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 0.00%    
Maximum      
Defined benefit plan, plan assets, target allocation, percentage 40.00%