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Investments - Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | $ 54,383 | $ 53,616
Gross unrealized gains | 633 | 361
Gross unrealized losses | (581) | (1,230)
Fair value | 54,435 | 52,747
U.S. government and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 15,640 | 11,423
Gross unrealized gains | 86 | 15
Gross unrealized losses | (14) | (330)
Fair value | 15,712 | 11,108
Municipal |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 7,451 | 8,985
Gross unrealized gains | 29 | 33
Gross unrealized losses | (194) | (176)
Fair value | 7,286 | 8,842
Corporate |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 27,849 | 30,630
Gross unrealized gains | 470 | 272
Gross unrealized losses | (357) | (710)
Fair value | 27,962 | 30,192
Foreign government |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 1,385 | 1,352
Gross unrealized gains | 18 | 22
Gross unrealized losses | (12) | (10)
Fair value | 1,391 | 1,364
ABS |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 973 | 1,130
Gross unrealized gains | 14 | 19
Gross unrealized losses | (4) | (4)
Fair value | 983 | 1,145
MBS |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost, net | 1,085 | 96
Gross unrealized gains | 16 | 0
Gross unrealized losses | 0 | 0
Fair value | $ 1,101 | $ 96

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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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