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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Amortized Cost, Net of Allowance    
Due in one year or less $ 4,070  
Due after one year through five years 22,194  
Due after five years through ten years 15,712  
Due after ten years 6,239  
Mortgage-backed, asset-backed and collateralized 17,942  
Total 66,157  
Fair Value    
Due in one year or less 3,980  
Due after one year through five years 22,163  
Due after five years through ten years 15,010  
Due after ten years 5,190  
Mortgage-backed, asset-backed and collateralized 17,663  
Total [1] $ 64,006 $ 65,242
[1] See Note 10 for details of balances associated with variable interest entities.