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Investments - Schedule of Available-For-Sale Securities in an Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair value: |  |
Less than 12 months | $ 21,653 | $ 32,706
12 months or longer | 19,023 | 21,095
Total | 40,676 | 53,801
Gross unrealized losses: |  |
Less than 12 months | (44) | (399)
12 months or longer | (598) | (983)
Total | (642) | (1,382)
U.S. government and agency obligations |  |
Fair value: |  |
Less than 12 months | 19,515 | 31,032
12 months or longer | 15,677 | 18,732
Total | 35,192 | 49,764
Gross unrealized losses: |  |
Less than 12 months | (34) | (383)
12 months or longer | (308) | (630)
Total | (342) | (1,013)
Non-U.S. government and agency obligations |  |
Fair value: |  |
Less than 12 months | 2,138 | 1,674
12 months or longer | 3,346 | 2,363
Total | 5,484 | 4,037
Gross unrealized losses: |  |
Less than 12 months | (10) | (16)
12 months or longer | (290) | (353)
Total | $ (300) | $ (369)

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