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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, 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 $ (2,000)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,400  
Gross Unrealized Temporary Loss 1,903 $ 1,970
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss (76)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 82  
Gross Unrealized Temporary Loss 58 51
Non-redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss 58 $ 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 $ 418  
Number of Securities | Contracts 129  
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 $ 228  
Number of Securities | Contracts 60  
Percentage of gross unrealized loss 55.00%  
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 $ 190  
Number of Securities | Contracts 69  
Percentage of gross unrealized loss 45.00%  
20% or more | Twelve months or greater | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities | Contracts 7  
Gross Unrealized Temporary Loss $ 49  
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 63.00%