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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost, Net of Allowance    
Due in one year or less $ 4,290  
Due after one year through five years 22,473  
Due after five years through ten years 16,601  
Due after ten years 6,113  
Mortgage-backed, asset-backed and collateralized 18,379  
Total 67,856  
Fair Value    
Due in one year or less 4,210  
Due after one year through five years 22,353  
Due after five years through ten years 16,085  
Due after ten years 5,100  
Mortgage-backed, asset-backed and collateralized 18,279  
Total $ 66,027 $ 64,006