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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 46,101 | $ 44,524
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (61) | 0
Available for sale (AFS) fixed maturities | 46,134 | 46,505
Total fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 46,101 | 44,524
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (61) | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,418 | 2,069
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1,324) | (88)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 94 | 1,981
Available for sale (AFS) fixed maturities | 46,134 | 46,505
U.S. Government and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 190 | 199
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 15 | 10
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 15 | 10
Available for sale (AFS) fixed maturities | 205 | 209
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,526 | 6,604
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 388 | 363
Fixed maturities, Available for sale, Gross Unrealized, Losses | (8) | (4)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 380 | 359
Available for sale (AFS) fixed maturities | 6,906 | 6,963
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 164 | 170
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 6 | 3
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (1)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 6 | 2
Available for sale (AFS) fixed maturities | 170 | 172
Residential MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 3,078 | 2,900
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (6) | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 133 | 265
Fixed maturities, Available for sale, Gross Unrealized, Losses | (74) | (5)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 59 | 260
Available for sale (AFS) fixed maturities | 3,131 | 3,160
Commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 892 | 896
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 20 | 31
Fixed maturities, Available for sale, Gross Unrealized, Losses | (5) | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 15 | 31
Available for sale (AFS) fixed maturities | 907 | 927
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 4,456 | 4,307
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (17) | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 5 | 10
Fixed maturities, Available for sale, Gross Unrealized, Losses | (306) | (37)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | (301) | (27)
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 7,069 | 6,992
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (14) | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 65 | 156
Fixed maturities, Available for sale, Gross Unrealized, Losses | (362) | (20)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | (297) | 136
Available for sale (AFS) fixed maturities | 6,758 | 7,128
Corporate and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 23,726 | 22,456
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses | (24) | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 786 | 1,231
Fixed maturities, Available for sale, Gross Unrealized, Losses | (569) | (21)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 217 | 1,210
Available for sale (AFS) fixed maturities | 23,919 | 23,666
Managed by third parties | Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale (AFS) fixed maturities | $ 4,138 | $ 4,280

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