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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) $ in Millions | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 28,311 | $ 17,427
Twelve months or greater | 42,533 | 44,508
Total | 70,844 | 61,935
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 4,933 | 3,526
Twelve months or greater | 5,648 | 6,241
Total | $ 10,581 | $ 9,767
Number of Securities |  |
Total | security | 7,485 | 7,605
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 3,759 | $ 2,492
Six months or greater, but less than nine months | 423 | 343
Nine months or greater, but less than twelve months | 275 | 336
Twelve months or greater | 3,709 | 4,094
Total | 8,166 | 7,265
Gross Unrealized Losses |  |
Less than six months | 1,318 | 927
Six months or greater, but less than nine months | 158 | 96
Nine months or greater, but less than twelve months | 86 | 109
Twelve months or greater | 1,517 | 2,922
Total | $ 3,079 | $ 4,054
Number of Securities |  |
Less than six months | security | 697 | 533
Six months or greater, but less than nine months | security | 131 | 79
Nine months or greater, but less than twelve months | security | 68 | 90
Twelve months or greater | security | 740 | 997
Total | security | 1,636 | 1,699

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