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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 44,524 | $ 41,837
Available for sale (AFS) fixed maturities | 46,505 | 41,997
Total fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 44,524 | 41,837
Fixed maturities, Available for sale, Gross Unrealized, Gains | 2,069 | 763
Fixed maturities, Available for sale, Gross Unrealized, Losses | (88) | (603)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,981 | 160
Available for sale (AFS) fixed maturities | 46,505 | 41,997
U.S. Government and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 199 | 235
Fixed maturities, Available for sale, Gross Unrealized, Gains | 10 | 1
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 10 | (2)
Available for sale (AFS) fixed maturities | 209 | 233
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,604 | 6,825
Fixed maturities, Available for sale, Gross Unrealized, Gains | 363 | 169
Fixed maturities, Available for sale, Gross Unrealized, Losses | (4) | (55)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 359 | 114
Available for sale (AFS) fixed maturities | 6,963 | 6,939
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 170 | 140
Fixed maturities, Available for sale, Gross Unrealized, Gains | 3 | 2
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1) | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 2 | 2
Available for sale (AFS) fixed maturities | 172 | 142
Residential MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,900 | 2,476
Fixed maturities, Available for sale, Gross Unrealized, Gains | 265 | 277
Fixed maturities, Available for sale, Gross Unrealized, Losses | (5) | (9)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 260 | 268
Available for sale (AFS) fixed maturities | 3,160 | 2,744
Commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 896 | 905
Fixed maturities, Available for sale, Gross Unrealized, Gains | 31 | 17
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 31 | 15
Available for sale (AFS) fixed maturities | 927 | 920
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 4,307 | 4,350
Fixed maturities, Available for sale, Gross Unrealized, Gains | 10 | 1
Fixed maturities, Available for sale, Gross Unrealized, Losses | (37) | (73)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | (27) | (72)
Available for sale (AFS) fixed maturities | 4,280 | 4,278
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,992 | 5,431
Fixed maturities, Available for sale, Gross Unrealized, Gains | 156 | 129
Fixed maturities, Available for sale, Gross Unrealized, Losses | (20) | (27)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 136 | 102
Available for sale (AFS) fixed maturities | 7,128 | 5,533
Corporate and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 22,456 | 21,475
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,231 | 167
Fixed maturities, Available for sale, Gross Unrealized, Losses | (21) | (434)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,210 | (267)
Available for sale (AFS) fixed maturities | $ 23,666 | $ 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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