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Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 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 $ (1,900)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,100  
Gross Unrealized Temporary Loss 1,143 $ 1,696
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss (28)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 25  
Gross Unrealized Temporary Loss 5 $ 33
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 $ 117  
Number of Securities | Contracts 46  
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 $ 42  
Number of Securities | Contracts 27  
Percentage of gross unrealized loss 36.00%  
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 $ 75  
Number of Securities | Contracts 19  
Percentage of gross unrealized loss 64.00%