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Investments - Securities with a Decline in Fair Value (Details)
$ in Millions
Mar. 31, 2017
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 $ 3,960
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 265
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 4,067
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 276
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (107)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (11)
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 870
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 47
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 $ 619
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 116
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 630
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 123
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (11)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (7)
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 532
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 21
Exchange Traded Funds [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Losses $ (4)
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