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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, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 62,267 | $ 56,293
Gross unrealized, Gains | 4,501 | 2,847
Gross unrealized, Losses | (217) | (96)
Fair value | 66,551 | 59,044
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 2,737 | 4,971
Gross unrealized, Gains | 114 | 141
Gross unrealized, Losses | (1) | (26)
Fair value | 2,850 | 5,086
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,948 | 8,080
Gross unrealized, Gains | 769 | 551
Gross unrealized, Losses | (8) | (11)
Fair value | 9,709 | 8,620
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 48,317 | 41,090
Gross unrealized, Gains | 3,554 | 2,035
Gross unrealized, Losses | (194) | (47)
Fair value | 51,677 | 43,078
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 972 | 968
Gross unrealized, Gains | 45 | 16
Gross unrealized, Losses | 0 | (5)
Fair value | 1,017 | 979
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,211 | 860
Gross unrealized, Gains | 9 | 8
Gross unrealized, Losses | (14) | (6)
Fair value | 1,206 | 862
MBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 82 | 324
Gross unrealized, Gains | 10 | 96
Gross unrealized, Losses | 0 | (1)
Fair value | $ 92 | $ 419

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