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Investments - Schedule of Contractual Maturities of Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 1,198  
Due after one year through five years 4,011  
Due after five years through ten years 3,554  
Due after ten years 7,311  
Total 16,074 $ 14,361
Fair value    
Due in one year or less 1,194  
Due after one year through five years 3,993  
Due after five years through ten years 3,542  
Due after ten years 7,142  
Total $ 15,871 $ 13,791
% of fair value    
Due in one year or less 7.50%  
Due after one year through five years 25.20%  
Due after five years through ten years 22.30%  
Due after ten years 45.00%  
Total 100.00%