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Investments (Contractual Maturity Dates For Fixed-Maturity And Short-Term Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 1,363  
Due after one year through five years 3,933  
Due after five years through ten years 3,701  
Due after ten years 8,036  
Total 17,033 $ 14,361
Fair value    
Due in one year or less 1,358  
Due after one year through five years 3,886  
Due after five years through ten years 3,608  
Due after ten years 7,628  
Total $ 16,480 $ 13,791
% of fair value    
Due in one year or less 8.20%  
Due after one year through five years 23.60%  
Due after five years through ten years 21.90%  
Due after ten years 46.30%  
Total 100.00%