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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, 2018
USD ($)
Contracts
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Change in Gross Unrealized Temporary Loss $ 1,355 $ (590) $ 535
Fixed Maturities Available For Sale With Gross Unrealized Loss of Equal To Or Greater Than Stated Percentage 20.00%    
Fixed maturity securities      
Debt Securities, Available-for-sale [Line Items]      
Change in Gross Unrealized Temporary Loss $ (1,000)    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,300    
20% or more | Six months or greater | Fixed maturity securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 11    
Number of Securities | Contracts 12