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Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 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 $ (1,700)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,700  
Gross Unrealized Temporary Loss 1,957 $ 1,970
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss (41)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 117  
Gross Unrealized Temporary Loss 62 51
Non-redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss 60 $ 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 $ 472  
Number of Securities | Contracts 113  
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 $ 231  
Number of Securities | Contracts 55  
Percentage of gross unrealized loss 49.00%  
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 $ 241  
Number of Securities | Contracts 58  
Percentage of gross unrealized loss 51.00%  
20% or more | Twelve months or greater | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities | Contracts 9  
Gross Unrealized Temporary Loss $ 47  
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 64.00%