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Investments - Schedule of Contractual Maturities of Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Amortized cost    
Due in one year or less $ 1,008  
Due after one year through five years 3,667  
Due after five years through ten years 4,084  
Due after ten years 9,237  
Total 17,996 $ 17,033
Fair value    
Due in one year or less 1,001  
Due after one year through five years 3,679  
Due after five years through ten years 4,109  
Due after ten years 8,990  
Total $ 17,779 $ 16,480
% of fair value    
Due in one year or less 5.60%  
Due after one year through five years 20.70%  
Due after five years through ten years 23.10%  
Due after ten years 50.60%  
Total 100.00%