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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, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 56,831 | $ 57,134
Gross unrealized, Gains | 1,635 | 993
Gross unrealized, Losses | (264) | (957)
Fair value | 58,202 | 57,170
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,775 | 5,386
Gross unrealized, Gains | 119 | 137
Gross unrealized, Losses | (2) | (6)
Fair value | 3,892 | 5,517
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,879 | 8,963
Gross unrealized, Gains | 393 | 249
Gross unrealized, Losses | (8) | (43)
Fair value | 9,264 | 9,169
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 41,943 | 40,536
Gross unrealized, Gains | 998 | 490
Gross unrealized, Losses | (242) | (890)
Fair value | 42,699 | 40,136
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 732 | 739
Gross unrealized, Gains | 21 | 13
Gross unrealized, Losses | (1) | (5)
Fair value | 752 | 747
Asset-backed securities (“ABS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,060 | 1,049
Gross unrealized, Gains | 7 | 6
Gross unrealized, Losses | (9) | (10)
Fair value | 1,058 | 1,045
Residential mortgage-backed securities (“RMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 354 | 377
Gross unrealized, Gains | 89 | 89
Gross unrealized, Losses | (1) | (2)
Fair value | 442 | 464
Commercial mortgage-backed securities (“CMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 67 | 63
Gross unrealized, Gains | 7 | 8
Gross unrealized, Losses | (1) | (1)
Fair value | 73 | 70
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 21 | 21
Gross unrealized, Gains | 1 | 1
Gross unrealized, Losses | 0 | 0
Fair value | $ 22 | $ 22

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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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