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Investments - Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | $ 51,837 | $ 49,649
Gross unrealized gains | 408 | 650
Gross unrealized losses | (1,468) | (1,434)
Fair value | 50,777 | 48,865
U.S. government and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 10,142 | 8,624
Gross unrealized gains | 56 | 114
Gross unrealized losses | (168) | (119)
Fair value | 10,030 | 8,619
Municipal |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 5,491 | 6,049
Gross unrealized gains | 61 | 109
Gross unrealized losses | (160) | (152)
Fair value | 5,392 | 6,006
Corporate |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 33,110 | 31,951
Gross unrealized gains | 273 | 397
Gross unrealized losses | (1,114) | (1,143)
Fair value | 32,269 | 31,205
Foreign government |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 1,255 | 1,286
Gross unrealized gains | 4 | 17
Gross unrealized losses | (19) | (13)
Fair value | 1,240 | 1,290
ABS |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 1,839 | 1,739
Gross unrealized gains | 14 | 13
Gross unrealized losses | (7) | (7)
Fair value | $ 1,846 | $ 1,745

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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