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Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 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 $ 3,400
Gross Unrealized Temporary Loss 5,400
Equity securities  
Schedule of Available-for-sale Securities [Line Items]  
Change in Gross Unrealized Temporary Loss 91
Gross Unrealized Temporary Loss 158
20% or more | Six months or greater | Fixed Maturity Securities  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Temporary Loss $ 364
Number of Securities | Contracts 69
20% or more | Six months or greater | Fixed Maturity Securities | Investment Grade  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Temporary Loss $ 242
Number of Securities | Contracts 36
Percentage of gross unrealized loss 66.00%
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 $ 122
Number of Securities | Contracts 33
Percentage of gross unrealized loss 34.00%
20% or more | Twelve months or greater | Equity securities  
Schedule of Available-for-sale Securities [Line Items]  
Number of Securities | Contracts 12
Gross Unrealized Temporary Loss $ 36
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%