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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)