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Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Contracts
Dec. 31, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Equity securities available-for-sale with gross unrealized loss of equal to or greater than stated percentage 20.00%  
Fixed Maturity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss $ (2,100)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,800  
Gross Unrealized Temporary Loss 1,394 $ 1,961
20% or more | Six months or greater | Fixed Maturity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 168  
Number of Securities | Contracts 56  
External Credit Rating, Non Investment Grade | 20% or more | Six months or greater | Fixed Maturity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 36  
Number of Securities | Contracts 28  
Percentage of gross unrealized loss 21.00%  
External Credit Rating, Investment Grade | 20% or more | Six months or greater | Fixed Maturity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 132  
Number of Securities | Contracts 28  
Percentage of gross unrealized loss 79.00%