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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, 2015
USD ($)
Contracts
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 $ 2,400
Gross Unrealized Temporary Loss 4,400
Equity securities  
Schedule of Available-for-sale Securities [Line Items]  
Change in Gross Unrealized Temporary Loss 80
Gross Unrealized Temporary Loss 147
20% or more | Six months or greater | Fixed Maturity Securities  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Temporary Loss $ 295
Number of Securities | Contracts 62
20% or more | Six months or greater | Fixed Maturity Securities | Investment Grade  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Temporary Loss $ 217
Number of Securities | Contracts 34
Percentage of gross unrealized loss 74.00%
20% or more | Six months or greater | Fixed Maturity Securities | Below Investment Grade  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Temporary Loss $ 78
Number of Securities | Contracts 28
Percentage of gross unrealized loss 26.00%
20% or more | Twelve months or greater | Equity securities  
Schedule of Available-for-sale Securities [Line Items]  
Number of Securities | Contracts 8
Gross Unrealized Temporary Loss $ 31
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 58.00%