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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost, Net of Allowance    
Due in one year or less $ 4,952  
Due after one year through five years 23,651  
Due after five years through ten years 16,357  
Due after ten years 6,118  
Mortgage-backed, asset-backed and collateralized 20,887  
Total 71,965  
Fair Value    
Due in one year or less 4,936  
Due after one year through five years 23,727  
Due after five years through ten years 16,260  
Due after ten years 5,317  
Mortgage-backed, asset-backed and collateralized 20,944  
Total $ 71,184 $ 64,006