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Investments - Securities with a Decline in Fair Value (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Fixed Maturities [Member] | Investment Grade [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Fair Value $ 4,346
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 308
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 4,475
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 327
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (129)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (19)
Fixed Maturities [Member] | Investment Grade [Member] | One Year Or Less [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 992
Fixed Maturities [Member] | Investment Grade [Member] | More Than One Year [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 53
Fixed Maturities [Member] | Below Investment Grade [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Fair Value $ 724
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 186
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 736
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 203
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (12)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (17)
Fixed Maturities [Member] | Below Investment Grade [Member] | One Year Or Less [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 591
Fixed Maturities [Member] | Below Investment Grade [Member] | More Than One Year [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 28
Exchange Traded Funds [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses $ (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 400
Other Equities [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Securities with a significant unrealized loss reflected in accumulated other comprehensive income $ 0