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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 41,243      
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 42,318 $ 41,243    
Group Insurance Policy [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,160 8,210 $ 8,233  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 254 245 245 $ 237
Beginning liabilities for unpaid losses and loss adjustment expenses, net 7,915 7,965 7,996  
Provision for unpaid losses and loss adjustment expenses        
Current accident year 5,145 4,853 5,021  
Prior year's discount accretion 193 202 201  
Prior accident year development [1] (502) (381) (458)  
Total provision for unpaid losses and loss adjustment expenses 4,836 4,674 4,764  
Payments        
Current incurral year (2,575) (2,456) (2,631)  
Prior incurral years (2,156) (2,268) (2,164)  
Total payments (4,731) (4,724) (4,795)  
Ending liabilities for unpaid losses and loss adjustment expenses, net 8,020 7,915 7,965  
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,274 8,160 8,210  
Group Insurance Policy [Member] | Group disability        
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1] 457 325 380  
Group Insurance Policy [Member] | Group long-term disability        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 243      
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 6,620      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 6,863      
Group Insurance Policy [Member] | Group life and accident, excluding premium waiver        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 5      
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1] 36 50 65  
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 739      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 744      
Group Insurance Policy [Member] | Group supplemental health        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 4      
Provision for unpaid losses and loss adjustment expenses        
Prior accident year development [1] 9 6 10  
Payments        
Ending liabilities for unpaid losses and loss adjustment expenses, net 34      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 38      
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 $ 182 $ 185 $ 179