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Reserve for Unpaid Losses and Loss Adjustment Expenses - EB Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 44,610      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 45,266      
Group Insurance Policy [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,206 $ 8,274    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (288) (255) $ (282) $ (254)
Ending liabilities for unpaid losses and loss adjustment expenses, gross 7,873 7,979 $ 7,924 $ 8,020
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,161 8,234    
Provision for unpaid losses and loss adjustment expense        
Current incurral year 1,376 1,376    
Prior year's discount accretion 55 53    
Prior incurral year development [1] (197) (189)    
Total provision for unpaid losses and loss adjustment expenses 1,234 1,240    
Less: payments        
Current incurral year (382) (357)    
Prior incurral years (903) (924)    
Total payments (1,285) (1,281)    
Group Insurance Policy [Member] | Other Operating Income (Expense) [Member]        
Provision for unpaid losses and loss adjustment expense        
Total provision for unpaid losses and loss adjustment expenses $ 44 $ 45