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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities AFS by Sector - Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Contracts
Debt Securities, Available-for-sale [Line Items]  
Fixed maturity 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 losses of securities in an unrealized loss position $ (1,100)
Gross unrealized losses of securities in an unrealized loss position 214
20% or more | Six months or greater | Fixed maturity securities  
Debt Securities, Available-for-sale [Line Items]  
Gross unrealized losses of securities in an unrealized loss position $ 7
Number of Securities | Contracts 7