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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, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 57,134 | $ 57,525
Gross unrealized gains | 993 | 1,750
Gross unrealized losses | (957) | (283)
Fixed income securities | 57,170 | 58,992
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 5,386 | 3,580
Gross unrealized gains | 137 | 56
Gross unrealized losses | (6) | (20)
Fixed income securities | 5,517 | 3,616
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,963 | 8,053
Gross unrealized gains | 249 | 311
Gross unrealized losses | (43) | (36)
Fixed income securities | 9,169 | 8,328
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 40,536 | 42,996
Gross unrealized gains | 490 | 1,234
Gross unrealized losses | (890) | (204)
Fixed income securities | 40,136 | 44,026
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 739 | 1,005
Gross unrealized gains | 13 | 27
Gross unrealized losses | (5) | (11)
Fixed income securities | 747 | 1,021
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,049 | 1,266
Gross unrealized gains | 6 | 13
Gross unrealized losses | (10) | (7)
Fixed income securities | 1,045 | 1,272
RMBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 377 | 480
Gross unrealized gains | 89 | 101
Gross unrealized losses | (2) | (3)
Fixed income securities | 464 | 578
CMBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 63 | 124
Gross unrealized gains | 8 | 6
Gross unrealized losses | (1) | (2)
Fixed income securities | 70 | 128
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 21 | 21
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | 0
Fixed income securities | $ 22 | $ 23

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