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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 12 Months Ended
Jun. 30, 2015
USD ($)
Contracts
Dec. 31, 2014
USD ($)
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 $ 1,500  
Gross Unrealized Temporary Loss 3,500  
Gross Unrealized Temporary Loss 802 $ 888
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Change in Gross Unrealized Temporary Loss 6  
Gross Unrealized Temporary Loss 73  
Gross Unrealized Temporary Loss 43 37
Non-redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss 43 $ 37
20% or more [Member] | Six months or greater [Member] | Fixed Maturity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss $ 275  
Number of Securities | Contracts 63  
20% or more [Member] | Six months or greater [Member] | Fixed Maturity Securities | Investment Grade [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss $ 216  
Number of Securities | Contracts 35  
Percentage of gross unrealized loss 79.00%  
20% or more [Member] | Six months or greater [Member] | Fixed Maturity Securities | Below Investment Grade [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Temporary Loss $ 59  
Number of Securities | Contracts 28  
Percentage of gross unrealized loss 21.00%  
20% or more [Member] | Twelve months or greater [Member] | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Number of Securities | Contracts 8  
Gross Unrealized Temporary Loss $ 30  
20% or more [Member] | Twelve months or greater [Member] | Non-redeemable preferred stock | Aaa/Aa/A | Financial Services Industry [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of gross unrealized loss 57.00%