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Reserve for Unpaid Losses and Loss Adjustment Expenses - Group Benefits Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 42,318      
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 44,610 $ 42,318    
Group Insurance Policy [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,274 8,160 $ 8,210  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 282 254 245 $ 245
Beginning liabilities for unpaid losses and loss adjustment expenses, net 8,020 7,915 7,965  
Provision for unpaid losses and loss adjustment expenses        
Current Year Claims and Claims Adjustment Expense 5,195 5,145 4,853  
Prior year's discount accretion 194 193 202  
Prior accident year development [1] (561) (502) (381)  
Total provision for unpaid losses and loss adjustment expenses 4,828 4,836 4,674  
Payments        
Current incurral year (2,735) (2,575) (2,456)  
Prior incurral years (2,189) (2,156) (2,268)  
Total payments (4,924) (4,731) (4,724)  
Ending liabilities for unpaid losses and loss adjustment expenses, net 7,924 8,020 7,915  
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,206 8,274 8,160  
Group Insurance Policy [Member] | Disability Insurance Policy [Member]        
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1] 483 457 325  
Group Insurance Policy [Member] | Group long-term disability        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 270      
Beginning liabilities for unpaid losses and loss adjustment expenses, net        
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 6,594      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 6,864      
Group Insurance Policy [Member] | Group life and accident, excluding premium waiver        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 4      
Beginning liabilities for unpaid losses and loss adjustment expenses, net        
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1] 80 36 50  
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 682      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 686      
Group Insurance Policy [Member] | Group supplemental health        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 5      
Beginning liabilities for unpaid losses and loss adjustment expenses, net        
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1]   9 6  
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 34      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 39      
Group Insurance Policy [Member] | Other Operating Income (Expense) [Member]        
Provision for unpaid losses and loss adjustment expenses        
Total provision for unpaid losses and loss adjustment expenses $ 175 $ 182 $ 185