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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Amortized Cost, Net of Allowance    
Due in one year or less $ 4,517  
Due after one year through five years 23,415  
Due after five years through ten years 16,236  
Due after ten years 6,427  
Mortgage-backed, asset-backed and collateralized 19,589  
Total 70,184  
Fair Value    
Due in one year or less 4,461  
Due after one year through five years 23,408  
Due after five years through ten years 15,999  
Due after ten years 5,462  
Mortgage-backed, asset-backed and collateralized 19,530  
Total $ 68,860 $ 64,006