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Investments - Declines in Fair Value, Fixed Maturities (Details)
$ in Millions
Dec. 31, 2015
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 $ 4,411
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 180
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 4,558
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 204
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (147)
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 721
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 $ 534
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 124
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 557
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 149
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (23)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (25)
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 228
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 29
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