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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, 2016
USD ($)
Contracts
Dec. 31, 2015
USD ($)
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 $ (2,600)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,800  
Gross Unrealized Temporary Loss 1,757 $ 1,970
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss (97)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 61  
Gross Unrealized Temporary Loss 44 51
Non-redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss 44 $ 49
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 $ 321  
Number of Securities | Contracts 74  
20% or more | Six months or greater | Fixed Maturity Securities | Investment Grade    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 199  
Number of Securities | Contracts 35  
Percentage of gross unrealized loss 62.00%  
20% or more | Six months or greater | Fixed Maturity Securities | Below Investment Grade    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 122  
Number of Securities | Contracts 39  
Percentage of gross unrealized loss 38.00%  
20% or more | Twelve months or greater | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities | Contracts 6  
Gross Unrealized Temporary Loss $ 38  
20% or more | Twelve months or greater | Non-redeemable preferred stock | Aaa/Aa/A | Financial Services Industry    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of gross unrealized loss 61.00%