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Investments - Declines in Fair Value, Fixed Maturities (Details)
$ in Millions
Mar. 31, 2016
USD ($)
Debt Securities [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 $ 1,787
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 311
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 1,840
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 340
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (53)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (29)
Debt Securities [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 292
Debt Securities [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 74
Debt Securities [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 $ 350
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 168
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 374
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 (24)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (35)
Debt Securities [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 145
Debt Securities [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 34
Equity securities [Member]  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]  
Securities with a significant unrealized loss reflected in accumulated other comprehensive income $ 0