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Investments - Amortized cost, gross unrealized gains and losses and fair value for fixed income securities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost, net | $ 61,451 | $ 56,293
Gross unrealized gains | 4,976 | 2,847
Gross unrealized losses | (73) | (96)
Fixed income securities | 66,354 | 59,044
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 3,129 | 4,971
Gross unrealized gains | 94 | 141
Gross unrealized losses | (1) | (26)
Fixed income securities | 3,222 | 5,086
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 8,752 | 8,080
Gross unrealized gains | 837 | 551
Gross unrealized losses | (2) | (11)
Fixed income securities | 9,587 | 8,620
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 47,226 | 41,090
Gross unrealized gains | 3,981 | 2,035
Gross unrealized losses | (65) | (47)
Fixed income securities | 51,142 | 43,078
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,013 | 968
Gross unrealized gains | 42 | 16
Gross unrealized losses | 0 | (5)
Fixed income securities | 1,055 | 979
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,260 | 860
Gross unrealized gains | 15 | 8
Gross unrealized losses | (5) | (6)
Fixed income securities | 1,270 | 862
MBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 71 | 324
Gross unrealized gains | 7 | 96
Gross unrealized losses | 0 | (1)
Fixed income securities | $ 78 | $ 419

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