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Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 65.00% 71.00%  
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Future capital call commitments for limited partnership investments $ 574    
Defined contribution plan, maximum annual contributions per employee, percent 50.00%    
Defined contribution plan, employer matching contribution, percent of match 70.00%    
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%    
Defined contribution plan, employers matching contribution, vesting period in years 5 years    
Benefit expense for the Company's savings plan $ 71 $ 76 $ 75
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%    
First Year of Employment      
Defined contribution plan, employer matching contribution, percent of match 35.00%    
Defined contribution plan, employer matching contribution, percent of employees' gross pay 6.00%    
Pension Benefits      
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 81.00% 85.00%  
Defined benefit plan, accumulated benefit obligation $ 2,465 $ 2,749  
Actuarial (gain) loss (187) 99  
Total non-service cost (benefit) (23) (7) (10)
Future capital call commitments for limited partnership investments $ 93    
Limited partnership equity related hedge fund strategy plan assets 66.00%    
Limited partnership hedge fund multi strategy plan assets 28.00%    
Limited partnership hedge fund strategy distressed investments plan assets 6.00%    
Defined benefit plan, expected future employer contributions, next fiscal year $ 8    
Postretirement Benefits      
Actuarial (gain) loss 0 (1)  
Total non-service cost (benefit) $ (2) $ (2) $ (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 $ 2    
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      
Total non-service cost (benefit) $ (8) $ (2) $ (3)
Insurance Claims and Policyholder's Benefits, Including Policyholder's Dividends | Postretirement Benefits      
Total non-service cost (benefit) (1) (1) (1)
Other Expense | Pension Benefits      
Total non-service cost (benefit) (15) (5) (7)
Other Expense | Postretirement Benefits      
Total non-service cost (benefit) $ (1) $ (1) $ (1)