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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | $ 40,408 |  | $ 44,524
Fixed maturities, available for sale, allowance for expected credit losses | 40 |  | 0
Available for sale (AFS) fixed maturities | 43,207 |  | 46,505
Total fixed maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 40,408 |  | 44,524
Fixed maturities, available for sale, allowance for expected credit losses | 40 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 2,957 |  | 2,069
Fixed maturities, Available for sale, Gross Unrealized, Losses | (118) |  | (88)
Available for sale (AFS) fixed maturities | 43,207 |  | 46,505
Total fixed maturities | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 2,839 |  | 1,981
U.S. Government and government agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 231 |  | 199
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 11 |  | 10
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 |  | 0
Available for sale (AFS) fixed maturities | 242 |  | 209
U.S. Government and government agencies | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 11 |  | 10
States, municipalities and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 5,249 |  | 6,604
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 486 |  | 363
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) |  | (4)
Available for sale (AFS) fixed maturities | 5,733 |  | 6,963
States, municipalities and political subdivisions | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 484 |  | 359
Foreign government |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 203 |  | 170
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 8 |  | 3
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 |  | (1)
Available for sale (AFS) fixed maturities | 211 |  | 172
Foreign government | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 8 |  | 2
Residential MBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 2,812 |  | 2,900
Fixed maturities, available for sale, allowance for expected credit losses | 3 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 251 |  | 265
Fixed maturities, Available for sale, Gross Unrealized, Losses | (5) |  | (5)
Available for sale (AFS) fixed maturities | 3,055 |  | 3,160
Residential MBS | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 246 |  | 260
Commercial MBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 748 |  | 896
Fixed maturities, available for sale, allowance for expected credit losses | 0 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 43 |  | 31
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1) |  | 0
Available for sale (AFS) fixed maturities | 790 |  | 927
Commercial MBS | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 42 |  | 31
Collateralized loan obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 4,556 |  | 4,307
Fixed maturities, available for sale, allowance for expected credit losses | 13 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 27 |  | 10
Fixed maturities, Available for sale, Gross Unrealized, Losses | (17) |  | (37)
Collateralized loan obligations | Managed by third parties |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available for sale (AFS) fixed maturities | 4,553 |  | 4,280
Collateralized loan obligations | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 10 |  | (27)
Other asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 7,138 |  | 6,992
Fixed maturities, available for sale, allowance for expected credit losses | 18 |  | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 169 |  | 156
Fixed maturities, Available for sale, Gross Unrealized, Losses | (66) |  | (20)
Available for sale (AFS) fixed maturities | 7,223 |  | 7,128
Other asset-backed securities | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 103 |  | 136
Corporate and other |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, Available for sale, Amortized Cost | 19,471 |  | 22,456
Fixed maturities, available for sale, allowance for expected credit losses | 6 | $ 0 | 0
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,962 |  | 1,231
Fixed maturities, Available for sale, Gross Unrealized, Losses | (27) |  | (21)
Available for sale (AFS) fixed maturities | 21,400 |  | 23,666
Corporate and other | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ 1,935 |  | $ 1,210

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