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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 42,908 | $ 41,837
Available for sale (AFS) fixed maturities | 44,710 | 41,997
Total fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 42,908 | 41,837
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,895 | 763
Fixed maturities, Available for sale, Gross Unrealized, Losses | (93) | (603)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,802 | 160
Available for sale (AFS) fixed maturities | 44,710 | 41,997
U.S. Government and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 226 | 235
Fixed maturities, Available for sale, Gross Unrealized, Gains | 4 | 1
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 2 | (2)
Available for sale (AFS) fixed maturities | 228 | 233
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,628 | 6,825
Fixed maturities, Available for sale, Gross Unrealized, Gains | 374 | 169
Fixed maturities, Available for sale, Gross Unrealized, Losses | (6) | (55)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 368 | 114
Available for sale (AFS) fixed maturities | 6,996 | 6,939
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 146 | 140
Fixed maturities, Available for sale, Gross Unrealized, Gains | 3 | 2
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 3 | 2
Available for sale (AFS) fixed maturities | 149 | 142
Residential MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,368 | 2,476
Fixed maturities, Available for sale, Gross Unrealized, Gains | 303 | 277
Fixed maturities, Available for sale, Gross Unrealized, Losses | (4) | (9)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 299 | 268
Available for sale (AFS) fixed maturities | 2,667 | 2,744
Commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 938 | 905
Fixed maturities, Available for sale, Gross Unrealized, Gains | 36 | 17
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 36 | 15
Available for sale (AFS) fixed maturities | 974 | 920
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 4,359 | 4,350
Fixed maturities, Available for sale, Gross Unrealized, Gains | 10 | 1
Fixed maturities, Available for sale, Gross Unrealized, Losses | (36) | (73)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | (26) | (72)
Available for sale (AFS) fixed maturities | 4,333 | 4,278
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 5,749 | 5,431
Fixed maturities, Available for sale, Gross Unrealized, Gains | 205 | 129
Fixed maturities, Available for sale, Gross Unrealized, Losses | (10) | (27)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 195 | 102
Available for sale (AFS) fixed maturities | 5,944 | 5,533
Corporate and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 22,494 | 21,475
Fixed maturities, Available for sale, Gross Unrealized, Gains | 960 | 167
Fixed maturities, Available for sale, Gross Unrealized, Losses | (35) | (434)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 925 | (267)
Available for sale (AFS) fixed maturities | $ 23,419 | $ 21,208

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- Definition Amount before tax of net unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References No definition available. + Details
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