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Investments - Declines in Fair Value, Fixed Maturities (Details)
$ in Millions
Sep. 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 $ 784
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 331
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 797
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 345
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (13)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (14)
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 329
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 58
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 $ 277
Available For Sale Securities, Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 181
Available For Sale Securities, Continuous Unrealized Loss Position, One Year or Less, Amortized Cost 283
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Amortized Cost 197
Available-for-sale Securities, Continuous Unrealized Loss Position, One Year or Less, Accumulated Losses (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, More Than One Year, Accumulated Losses $ (16)
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 122
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 32
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