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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) $ in Millions | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 31,284 | $ 17,427
Twelve months or greater | 32,529 | 44,508
Total | 63,813 | 61,935
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 4,449 | 3,526
Twelve months or greater | 3,820 | 6,241
Total | $ 8,269 | $ 9,767
Number of Securities |  |
Total | security | 6,458 | 7,605
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 700 | $ 2,492
Six months or greater, but less than nine months | 80 | 343
Nine months or greater, but less than twelve months | 1,658 | 336
Twelve months or greater | 3,300 | 4,094
Total | 5,738 | 7,265
Gross Unrealized Losses |  |
Less than six months | 254 | 927
Six months or greater, but less than nine months | 35 | 96
Nine months or greater, but less than twelve months | 639 | 109
Twelve months or greater | 1,285 | 2,922
Total | $ 2,213 | $ 4,054
Number of Securities |  |
Less than six months | security | 294 | 533
Six months or greater, but less than nine months | security | 42 | 79
Nine months or greater, but less than twelve months | security | 367 | 90
Twelve months or greater | security | 597 | 997
Total | security | 1,300 | 1,699

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