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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost, net | $ 46,120 | $ 45,370
Gross unrealized, Gains | 211 | 92
Gross unrealized, Losses | (2,228) | (2,977)
Fixed income securities | 44,103 | 42,485
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 7,826 | 8,123
Gross unrealized, Gains | 21 | 6
Gross unrealized, Losses | (152) | (231)
Fixed income securities | 7,695 | 7,898
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 6,499 | 6,500
Gross unrealized, Gains | 65 | 36
Gross unrealized, Losses | (240) | (326)
Fixed income securities | 6,324 | 6,210
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 29,705 | 28,562
Gross unrealized, Gains | 118 | 46
Gross unrealized, Losses | (1,787) | (2,345)
Fixed income securities | 28,036 | 26,263
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 1,112 | 997
Gross unrealized, Gains | 3 | 0
Gross unrealized, Losses | (24) | (40)
Fixed income securities | 1,091 | 957
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost, net | 978 | 1,188
Gross unrealized, Gains | 4 | 4
Gross unrealized, Losses | (25) | (35)
Fixed income securities | $ 957 | $ 1,157

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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