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Investments - Schedule of Available-for-Sale Securities Whose Value is Below Amortized Cost (Details) $ in Millions | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Nine months or greater, but less than twelve months | $ 36,227 | $ 17,427
Twelve months or greater | 34,177 | 44,508
Total | 70,404 | 61,935
Gross Unrealized Losses |  |
Nine months or greater, but less than twelve months | 6,009 | 3,526
Twelve months or greater | 5,213 | 6,241
Total | $ 11,222 | $ 9,767
Number of Securities |  |
Total | security | 7,467 | 7,605
Fair Value Decline, Greater Than 20% |  |
Fair Value |  |
Less than six months | $ 3,536 | $ 2,492
Six months or greater, but less than nine months | 2,352 | 343
Nine months or greater, but less than twelve months | 378 | 336
Twelve months or greater | 3,321 | 4,094
Total | 9,587 | 7,265
Gross Unrealized Losses |  |
Less than six months | 1,067 | 927
Six months or greater, but less than nine months | 974 | 96
Nine months or greater, but less than twelve months | 156 | 109
Twelve months or greater | 1,451 | 2,922
Total | $ 3,648 | $ 4,054
Number of Securities |  |
Less than six months | security | 690 | 533
Six months or greater, but less than nine months | security | 496 | 79
Nine months or greater, but less than twelve months | security | 124 | 90
Twelve months or greater | security | 653 | 997
Total | security | 1,963 | 1,699

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