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Investments - Available for sale fixed maturities and equity securities (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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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

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