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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, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost, net | $ 42,027 | $ 41,376
Gross unrealized, Gains | 189 | 1,002
Gross unrealized, Losses | (1,471) | (242)
Fixed income securities, at fair value | 40,745 | 42,136
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 6,613 | 6,287
Gross unrealized, Gains | 3 | 12
Gross unrealized, Losses | (131) | (26)
Fixed income securities, at fair value | 6,485 | 6,273
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 5,805 | 6,130
Gross unrealized, Gains | 54 | 279
Gross unrealized, Losses | (161) | (16)
Fixed income securities, at fair value | 5,698 | 6,393
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 26,334 | 26,834
Gross unrealized, Gains | 120 | 688
Gross unrealized, Losses | (1,118) | (192)
Fixed income securities, at fair value | 25,336 | 27,330
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,092 | 982
Gross unrealized, Gains | 1 | 9
Gross unrealized, Losses | (40) | (6)
Fixed income securities, at fair value | 1,053 | 985
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 2,183 | 1,143
Gross unrealized, Gains | 11 | 14
Gross unrealized, Losses | (21) | (2)
Fixed income securities, at fair value | $ 2,173 | $ 1,155

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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=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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