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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) security in Millions, $ in Millions | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 30,166 | $ 17,427
Twelve months or greater | 36,345 | 44,508
Total | 66,511 | 61,935
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 4,537 | 3,526
Twelve months or greater | 6,468 | 6,241
Total | $ 11,005 | $ 9,767
Number of Securities |  |
Total | security | 6,985 | 7,605
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 5,405 | $ 2,492
Six months or greater, but less than nine months | 371 | 343
Nine months or greater, but less than twelve months | 71 | 336
Twelve months or greater | 4,440 | 4,094
Total | 10,287 | 7,265
Gross Unrealized Losses |  |
Less than six months | 1,621 | 927
Six months or greater, but less than nine months | 198 | 96
Nine months or greater, but less than twelve months | 28 | 109
Twelve months or greater | 2,218 | 2,922
Total | $ 4,065 | $ 4,054
Number of Securities |  |
Less than six months | security | 799 | 533
Six months or greater, but less than nine months | security | 216 | 79
Nine months or greater, but less than twelve months | security | 37 | 90
Twelve months or greater | security | 741 | 997
Total | security | 1,793 | 1,699

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for more than six months but less than nine, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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