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Investments - Amortized cost, gross unrealized gains and losses and fair value for fixed income securities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 56,209 | $ 57,525
Gross unrealized gains | 1,210 | 1,750
Gross unrealized losses | (745) | (283)
Fair value | 56,674 | 58,992
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,373 | 3,580
Gross unrealized gains | 50 | 56
Gross unrealized losses | (17) | (20)
Fair value | 3,406 | 3,616
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,404 | 8,053
Gross unrealized gains | 257 | 311
Gross unrealized losses | (92) | (36)
Fair value | 8,569 | 8,328
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 41,699 | 42,996
Gross unrealized gains | 763 | 1,234
Gross unrealized losses | (611) | (204)
Fair value | 41,851 | 44,026
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 968 | 1,005
Gross unrealized gains | 21 | 27
Gross unrealized losses | (10) | (11)
Fair value | 979 | 1,021
Asset-backed securities (“ABS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,196 | 1,266
Gross unrealized gains | 11 | 13
Gross unrealized losses | (10) | (7)
Fair value | 1,197 | 1,272
Residential mortgage-backed securities (“RMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 453 | 480
Gross unrealized gains | 100 | 101
Gross unrealized losses | (3) | (3)
Fair value | 550 | 578
Commercial mortgage-backed securities (“CMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 95 | 124
Gross unrealized gains | 6 | 6
Gross unrealized losses | (2) | (2)
Fair value | 99 | 128
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 21 | 21
Gross unrealized gains | 2 | 2
Gross unrealized losses | 0 | 0
Fair value | $ 23 | $ 23

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