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Investments - Available for sale fixed maturities and equity securities (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 35,445 $ 33,735
Available for sale (AFS) fixed maturities 36,456 34,544
Equity securities, Available for sale, Amortized Cost 1,356 1,351
Equity securities, Available for sale, Fair Value 1,579 1,502
Total fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 35,445 33,735
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,176 1,054
Fixed maturities, Available for sale, Gross Unrealized, Losses (165) (245)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 1,011 809
Available for sale (AFS) fixed maturities 36,456 34,544
U.S. Government and government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 289 315
Fixed maturities, Available for sale, Gross Unrealized, Gains 2 3
Fixed maturities, Available for sale, Gross Unrealized, Losses (3) (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (1) 0
Available for sale (AFS) fixed maturities 288 315
States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,736 6,650
Fixed maturities, Available for sale, Gross Unrealized, Gains 213 200
Fixed maturities, Available for sale, Gross Unrealized, Losses (48) (69)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 165 131
Available for sale (AFS) fixed maturities 6,901 6,781
Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 133 131
Fixed maturities, Available for sale, Gross Unrealized, Gains 5 5
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 5 5
Available for sale (AFS) fixed maturities 138 136
Residential MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 3,432 3,367
Fixed maturities, Available for sale, Gross Unrealized, Gains 295 281
Fixed maturities, Available for sale, Gross Unrealized, Losses (11) (13)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 284 268
Available for sale (AFS) fixed maturities 3,716 3,635
Commercial MBS    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 1,211 1,446
Fixed maturities, Available for sale, Gross Unrealized, Gains 43 49
Fixed maturities, Available for sale, Gross Unrealized, Losses (1) (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 42 47
Available for sale (AFS) fixed maturities 1,253 1,493
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,548 5,962
Fixed maturities, Available for sale, Gross Unrealized, Gains 74 43
Fixed maturities, Available for sale, Gross Unrealized, Losses (30) (46)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 44 (3)
Available for sale (AFS) fixed maturities 6,592 5,959
Corporate and other    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 17,096 15,864
Fixed maturities, Available for sale, Gross Unrealized, Gains 544 473
Fixed maturities, Available for sale, Gross Unrealized, Losses (72) (112)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 472 361
Available for sale (AFS) fixed maturities 17,568 16,225
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 1,356 1,351
Equity securities, Available for sale, Gross Unrealized, Gains 247 181
Equity securities, Available for sale, Gross Unrealized, Losses (24) (30)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 223 151
Equity securities, Available for sale, Fair Value 1,579 1,502
Common stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 884 879
Equity securities, Available for sale, Gross Unrealized, Gains 216 160
Equity securities, Available for sale, Gross Unrealized, Losses (21) (23)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 195 137
Equity securities, Available for sale, Fair Value 1,079 1,016
Perpetual preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, Available for sale, Amortized Cost 472 472
Equity securities, Available for sale, Gross Unrealized, Gains 31 21
Equity securities, Available for sale, Gross Unrealized, Losses (3) (7)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) 28 14
Equity securities, Available for sale, Fair Value $ 500 $ 486