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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) $ in Millions | Jun. 30, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 20,949 | $ 30,166
Twelve months or greater | 41,155 | 36,345
Total | 62,104 | 66,511
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 3,627 | 4,537
Twelve months or greater | 6,352 | 6,468
Total | $ 9,979 | $ 11,005
Number of Securities |  |
Total | security | 6,381 | 6,985
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 1,846 | $ 5,405
Six months or greater, but less than nine months | 1,215 | 371
Nine months or greater, but less than twelve months | 1,516 | 71
Twelve months or greater | 4,651 | 4,440
Total | 9,228 | 10,287
Gross Unrealized Losses |  |
Less than six months | 571 | 1,621
Six months or greater, but less than nine months | 372 | 198
Nine months or greater, but less than twelve months | 498 | 28
Twelve months or greater | 2,294 | 2,218
Total | $ 3,735 | $ 4,065
Number of Securities |  |
Less than six months | security | 359 | 799
Six months or greater, but less than nine months | security | 256 | 216
Nine months or greater, but less than twelve months | security | 304 | 37
Twelve months or greater | security | 796 | 741
Total | security | 1,715 | 1,793

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