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Investments - Amortized cost, gross unrealized gains and losses and fair value for fixed income securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost, net | $ 38,811 | $ 40,034
Gross unrealized, Gains | 1,330 | 2,563
Gross unrealized, Losses | (152) | (32)
Fixed income securities, at fair value | 39,989 | 42,565
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 3,035 | 2,058
Gross unrealized, Gains | 22 | 50
Gross unrealized, Losses | (15) | (1)
Fixed income securities, at fair value | 3,042 | 2,107
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 7,117 | 7,100
Gross unrealized, Gains | 318 | 480
Gross unrealized, Losses | (18) | (2)
Fixed income securities, at fair value | 7,417 | 7,578
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 26,515 | 29,057
Gross unrealized, Gains | 963 | 1,986
Gross unrealized, Losses | (111) | (26)
Fixed income securities, at fair value | 27,367 | 31,017
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,054 | 921
Gross unrealized, Gains | 12 | 37
Gross unrealized, Losses | (7) | 0
Fixed income securities, at fair value | 1,059 | 958
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,057 | 840
Gross unrealized, Gains | 14 | 9
Gross unrealized, Losses | (1) | (3)
Fixed income securities, at fair value | 1,070 | 846
MBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 33 | 58
Gross unrealized, Gains | 1 | 1
Gross unrealized, Losses | 0 | 0
Fixed income securities, at fair value | $ 34 | $ 59

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