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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 42,318      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 43,323      
Group Insurance Policy [Member]        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,274 $ 8,160    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (266) (243) $ (254) $ (245)
Ending liabilities for unpaid losses and loss adjustment expenses, gross 7,920 7,947 $ 8,020 $ 7,915
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,186 8,190    
Provision for unpaid losses and loss adjustment expense        
Current incurral year 2,662 2,622    
Prior year's discount accretion 103 103    
Prior incurral year development [1] (339) (265)    
Total provision for unpaid losses and loss adjustment expenses 2,426 2,460    
Less: payments        
Current incurral year (1,071) (1,012)    
Prior incurral years (1,455) (1,416)    
Total payments (2,526) (2,428)    
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 $ 92 $ 91