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Investments - Available for sale fixed maturities and equity securities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 33,735 $ 31,565
Available for sale (AFS) fixed maturities 34,544 32,284
Equity securities, Available for sale, Amortized Cost 1,351 1,469
Equity securities, Available for sale, Fair Value 1,502 1,553
Total fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 33,735 31,565
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,054 1,093
Fixed maturities, Available for sale, Gross Unrealized, Losses (245) (374)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 809 719
Available for sale (AFS) fixed maturities 34,544 32,284
U.S. Government and government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 315 305
Fixed maturities, Available for sale, Gross Unrealized, Gains 3 5
Fixed maturities, Available for sale, Gross Unrealized, Losses (3) (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 0 2
Available for sale (AFS) fixed maturities 315 307
States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,650 6,642
Fixed maturities, Available for sale, Gross Unrealized, Gains 200 249
Fixed maturities, Available for sale, Gross Unrealized, Losses (69) (35)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 131 214
Available for sale (AFS) fixed maturities 6,781 6,856
Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 131 147
Fixed maturities, Available for sale, Gross Unrealized, Gains 5 7
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 5 7
Available for sale (AFS) fixed maturities 136 154
Residential MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 3,367 3,236
Fixed maturities, Available for sale, Gross Unrealized, Gains 281 308
Fixed maturities, Available for sale, Gross Unrealized, Losses (13) (15)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 268 293
Available for sale (AFS) fixed maturities 3,635 3,529
Commercial MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 1,446 2,111
Fixed maturities, Available for sale, Gross Unrealized, Gains 49 77
Fixed maturities, Available for sale, Gross Unrealized, Losses (2) (1)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 47 76
Available for sale (AFS) fixed maturities 1,493 2,187
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 5,962 4,961
Fixed maturities, Available for sale, Gross Unrealized, Gains 43 25
Fixed maturities, Available for sale, Gross Unrealized, Losses (46) (52)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (3) (27)
Available for sale (AFS) fixed maturities 5,959 4,934
Corporate and other    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 15,864 14,163
Fixed maturities, Available for sale, Gross Unrealized, Gains 473 422
Fixed maturities, Available for sale, Gross Unrealized, Losses (112) (268)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 361 154
Available for sale (AFS) fixed maturities 16,225 14,317
Total equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 1,351 1,469
Equity securities, Available for sale, Gross Unrealized, Gains 181 169
Equity securities, Available for sale, Gross Unrealized, Losses (30) (85)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 151 84
Equity securities, Available for sale, Fair Value 1,502 1,553
Common stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 879 1,051
Equity securities, Available for sale, Gross Unrealized, Gains 160 146
Equity securities, Available for sale, Gross Unrealized, Losses (23) (79)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 137 67
Equity securities, Available for sale, Fair Value 1,016 1,118
Perpetual preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 472 418
Equity securities, Available for sale, Gross Unrealized, Gains 21 23
Equity securities, Available for sale, Gross Unrealized, Losses (7) (6)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 14 17
Equity securities, Available for sale, Fair Value $ 486 $ 435