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Investments - Declines in Fair Value, Fixed Maturities (Details)
$ in Millions
Jun. 30, 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 $ 471
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 382
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 479
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 406
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (24)
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 107
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 56
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 $ 274
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 283
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 281
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 311
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (7)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (28)
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 148
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 39
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