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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, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 56,750 | $ 57,525
Gross unrealized, Gains | 1,008 | 1,750
Gross unrealized, Losses | (867) | (283)
Fair value | 56,891 | 58,992
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,182 | 3,580
Gross unrealized, Gains | 40 | 56
Gross unrealized, Losses | (16) | (20)
Fair value | 3,206 | 3,616
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 9,454 | 8,053
Gross unrealized, Gains | 245 | 311
Gross unrealized, Losses | (71) | (36)
Fair value | 9,628 | 8,328
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 41,584 | 42,996
Gross unrealized, Gains | 590 | 1,234
Gross unrealized, Losses | (759) | (204)
Fair value | 41,415 | 44,026
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 917 | 1,005
Gross unrealized, Gains | 18 | 27
Gross unrealized, Losses | (9) | (11)
Fair value | 926 | 1,021
Asset-backed securities (“ABS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,084 | 1,266
Gross unrealized, Gains | 9 | 13
Gross unrealized, Losses | (8) | (7)
Fair value | 1,085 | 1,272
Residential mortgage-backed securities (“RMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 424 | 480
Gross unrealized, Gains | 98 | 101
Gross unrealized, Losses | (2) | (3)
Fair value | 520 | 578
Commercial mortgage-backed securities (“CMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 84 | 124
Gross unrealized, Gains | 6 | 6
Gross unrealized, Losses | (2) | (2)
Fair value | 88 | 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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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