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Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Actuarial (gain) loss $ 205 $ 261  
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 51.00% 61.00%  
Defined contribution plan, maximum annual contributions per employee, percent 50.00%    
Defined contribution plan, employer matching contribution, percent of match 100.00% 70.00%  
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00% 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    
Defined contribution plan, employer matching contribution, first year of employment, percent of match   35.00%  
Benefit expense for the Company's savings plan $ 70 $ 71 $ 71
Additional Contribution, Management Discretion      
Defined contribution plan, employer matching contribution, percent of match   80.00%  
Defined contribution plan, employer matching contribution, percent of employees' gross pay   6.00%  
Defined contribution plan, employer discretionary contribution amount, percent   2.00%  
Pension Benefits      
Defined benefit plan, accumulated benefit obligation 2,769 $ 2,661  
Actuarial (gain) loss 205 $ 261  
Future capital call commitments for limited partnership investments $ 190    
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 75.00% 79.00%  
Limited partnership equity related hedge fund strategy plan assets 69.00%    
Limited partnership hedge fund multi strategy plan assets 27.00%    
Limited partnership hedge fund strategy distressed investments plan assets 4.00%    
Defined benefit plan, expected future employer contributions, next fiscal year $ 6    
Postretirement Benefits      
Actuarial (gain) loss $ 2 $ 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 40.00%    
Company contribution of eligible compensation, depending on age, percent   3.00%  
Maximum      
Defined benefit plan, plan assets, target allocation, percentage 60.00%    
Company contribution of eligible compensation, depending on age, percent   5.00%  
Insurance Claims and Policyholder's Benefits, Including Policyholder's Dividends | Pension Benefits      
Net periodic defined benefits expense (reversal of expense), excluding service cost component $ 8 $ 1 $ 8
Other Expense | Pension Benefits      
Net periodic defined benefits expense (reversal of expense), excluding service cost component $ 19 $ 2 $ 15