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Investments - Available for sale fixed maturities and equity securities (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 36,231 | $ 33,735
Available for sale (AFS) fixed maturities | 37,504 | 34,544
Equity securities, Available for sale, Amortized Cost | 1,338 | 1,351
Equity securities, Available for sale, Fair Value | 1,581 | 1,502
Total fixed maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 36,231 | 33,735
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,380 | 1,054
Fixed maturities, Available for sale, Gross Unrealized, Losses | (107) | (245)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,273 | 809
Available for sale (AFS) fixed maturities | 37,504 | 34,544
U.S. Government and government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 276 | 315
Fixed maturities, Available for sale, Gross Unrealized, Gains | 2 | 3
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 0 | 0
Available for sale (AFS) fixed maturities | 276 | 315
States, municipalities and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,811 | 6,650
Fixed maturities, Available for sale, Gross Unrealized, Gains | 248 | 200
Fixed maturities, Available for sale, Gross Unrealized, Losses | (29) | (69)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 219 | 131
Available for sale (AFS) fixed maturities | 7,030 | 6,781
Foreign government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 136 | 131
Fixed maturities, Available for sale, Gross Unrealized, Gains | 4 | 5
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 4 | 5
Available for sale (AFS) fixed maturities | 140 | 136
Residential MBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 3,251 | 3,367
Fixed maturities, Available for sale, Gross Unrealized, Gains | 323 | 281
Fixed maturities, Available for sale, Gross Unrealized, Losses | (10) | (13)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 313 | 268
Available for sale (AFS) fixed maturities | 3,564 | 3,635
Commercial MBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 1,041 | 1,446
Fixed maturities, Available for sale, Gross Unrealized, Gains | 44 | 49
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 44 | 47
Available for sale (AFS) fixed maturities | 1,085 | 1,493
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 7,107 | 5,962
Fixed maturities, Available for sale, Gross Unrealized, Gains | 101 | 43
Fixed maturities, Available for sale, Gross Unrealized, Losses | (18) | (46)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 83 | (3)
Available for sale (AFS) fixed maturities | 7,190 | 5,959
Corporate and other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 17,609 | 15,864
Fixed maturities, Available for sale, Gross Unrealized, Gains | 658 | 473
Fixed maturities, Available for sale, Gross Unrealized, Losses | (48) | (112)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 610 | 361
Available for sale (AFS) fixed maturities | 18,219 | 16,225
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 1,338 | 1,351
Equity securities, Available for sale, Gross Unrealized, Gains | 271 | 181
Equity securities, Available for sale, Gross Unrealized, Losses | (28) | (30)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 243 | 151
Equity securities, Available for sale, Fair Value | 1,581 | 1,502
Common stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 860 | 879
Equity securities, Available for sale, Gross Unrealized, Gains | 227 | 160
Equity securities, Available for sale, Gross Unrealized, Losses | (27) | (23)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 200 | 137
Equity securities, Available for sale, Fair Value | 1,060 | 1,016
Perpetual preferred stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 478 | 472
Equity securities, Available for sale, Gross Unrealized, Gains | 44 | 21
Equity securities, Available for sale, Gross Unrealized, Losses | (1) | (7)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 43 | 14
Equity securities, Available for sale, Fair Value | $ 521 | $ 486

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