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Investments - Available for sale fixed maturities and equity securities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 33,586 $ 31,565
Available for sale (AFS) fixed maturities 35,394 32,284
Equity securities, Available for sale, Amortized Cost 1,392 1,469
Equity securities, Available for sale, Fair Value 1,553 1,553
Total fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 33,586 31,565
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,885 1,093
Fixed maturities, Available for sale, Gross Unrealized, Losses (77) (374)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 1,808 719
Available for sale (AFS) fixed maturities 35,394 32,284
U.S. Government and government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 328 305
Fixed maturities, Available for sale, Gross Unrealized, Gains 6 5
Fixed maturities, Available for sale, Gross Unrealized, Losses (2) (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 4 2
Available for sale (AFS) fixed maturities 332 307
States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,597 6,642
Fixed maturities, Available for sale, Gross Unrealized, Gains 455 249
Fixed maturities, Available for sale, Gross Unrealized, Losses (5) (35)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 450 214
Available for sale (AFS) fixed maturities 7,047 6,856
Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 134 147
Fixed maturities, Available for sale, Gross Unrealized, Gains 7 7
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 7 7
Available for sale (AFS) fixed maturities 141 154
Residential MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 3,530 3,236
Fixed maturities, Available for sale, Gross Unrealized, Gains 300 308
Fixed maturities, Available for sale, Gross Unrealized, Losses (14) (15)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 286 293
Available for sale (AFS) fixed maturities 3,816 3,529
Commercial MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 1,764 2,111
Fixed maturities, Available for sale, Gross Unrealized, Gains 85 77
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (1)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 85 76
Available for sale (AFS) fixed maturities 1,849 2,187
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 5,844 4,961
Fixed maturities, Available for sale, Gross Unrealized, Gains 70 25
Fixed maturities, Available for sale, Gross Unrealized, Losses (25) (52)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 45 (27)
Available for sale (AFS) fixed maturities 5,889 4,934
Corporate and other    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 15,389 14,163
Fixed maturities, Available for sale, Gross Unrealized, Gains 962 422
Fixed maturities, Available for sale, Gross Unrealized, Losses (31) (268)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 931 154
Available for sale (AFS) fixed maturities 16,320 14,317
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 1,392 1,469
Equity securities, Available for sale, Gross Unrealized, Gains 191 169
Equity securities, Available for sale, Gross Unrealized, Losses (30) (85)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 161 84
Equity securities, Available for sale, Fair Value 1,553 1,553
Common stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 939 1,051
Equity securities, Available for sale, Gross Unrealized, Gains 157 146
Equity securities, Available for sale, Gross Unrealized, Losses (27) (79)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 130 67
Equity securities, Available for sale, Fair Value 1,069 1,118
Perpetual preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 453 418
Equity securities, Available for sale, Gross Unrealized, Gains 34 23
Equity securities, Available for sale, Gross Unrealized, Losses (3) (6)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 31 17
Equity securities, Available for sale, Fair Value $ 484 $ 435