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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, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 58,945 | $ 56,293
Gross unrealized, Gains | 2,196 | 2,847
Gross unrealized, Losses | (1,284) | (96)
Fair value | 59,857 | 59,044
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 5,104 | 4,971
Gross unrealized, Gains | 295 | 141
Gross unrealized, Losses | 0 | (26)
Fair value | 5,399 | 5,086
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,182 | 8,080
Gross unrealized, Gains | 555 | 551
Gross unrealized, Losses | (28) | (11)
Fair value | 8,709 | 8,620
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 43,624 | 41,090
Gross unrealized, Gains | 1,242 | 2,035
Gross unrealized, Losses | (1,231) | (47)
Fair value | 43,635 | 43,078
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 884 | 968
Gross unrealized, Gains | 30 | 16
Gross unrealized, Losses | (3) | (5)
Fair value | 911 | 979
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 852 | 860
Gross unrealized, Gains | 3 | 8
Gross unrealized, Losses | (19) | (6)
Fair value | 836 | 862
MBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 299 | 324
Gross unrealized, Gains | 71 | 96
Gross unrealized, Losses | (3) | (1)
Fair value | $ 367 | $ 419

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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=118939692&loc=d3e27161-111563 + Details
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