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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) $ in Millions | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 29,293 | $ 30,166
Twelve months or greater | 35,734 | 36,345
Total | 65,027 | 66,511
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 4,217 | 4,537
Twelve months or greater | 6,046 | 6,468
Total | $ 10,263 | $ 11,005
Number of Securities |  |
Total | security | 6,835 | 6,985,000,000
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 3,053 | $ 5,405
Six months or greater, but less than nine months | 1,600 | 371
Nine months or greater, but less than twelve months | 369 | 71
Twelve months or greater | 4,381 | 4,440
Total | 9,403 | 10,287
Gross Unrealized Losses |  |
Less than six months | 900 | 1,621
Six months or greater, but less than nine months | 518 | 198
Nine months or greater, but less than twelve months | 187 | 28
Twelve months or greater | 2,149 | 2,218
Total | $ 3,754 | $ 4,065
Number of Securities |  |
Less than six months | security | 522 | 799,000,000
Six months or greater, but less than nine months | security | 324 | 216,000,000
Nine months or greater, but less than twelve months | security | 208 | 37,000,000
Twelve months or greater | security | 737 | 741,000,000
Total | security | 1,791 | 1,793,000,000

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