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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, 2019
USD ($)
Contracts
Debt Securities, Available-for-sale [Line Items]  
Debt Securities 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 $ (3,100)
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 2,800
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 $ 113
Number of Securities | Contracts 37
Investment Grade | 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 $ 76
Number of Securities | Contracts 20
Percentage of gross unrealized loss 67.00%
Below Investment Grade | 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 $ 37
Number of Securities | Contracts 17
Percentage of gross unrealized loss 33.00%