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Investments - Amortized cost, gross unrealized gains and losses and fair value for fixed income securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost, net | $ 47,904 | $ 45,370
Gross unrealized, Gains | 103 | 92
Gross unrealized, Losses | (2,457) | (2,977)
Fixed income securities | 45,550 | 42,485
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 7,957 | 8,123
Gross unrealized, Gains | 3 | 6
Gross unrealized, Losses | (231) | (231)
Fixed income securities | 7,729 | 7,898
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 7,069 | 6,500
Gross unrealized, Gains | 34 | 36
Gross unrealized, Losses | (263) | (326)
Fixed income securities | 6,840 | 6,210
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 30,801 | 28,562
Gross unrealized, Gains | 63 | 46
Gross unrealized, Losses | (1,910) | (2,345)
Fixed income securities | 28,954 | 26,263
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,075 | 997
Gross unrealized, Gains | 0 | 0
Gross unrealized, Losses | (31) | (40)
Fixed income securities | 1,044 | 957
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,002 | 1,188
Gross unrealized, Gains | 3 | 4
Gross unrealized, Losses | (22) | (35)
Fixed income securities | $ 983 | $ 1,157

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