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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 39,659        
Payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross 41,243 $ 39,659      
Group Insurance Policy [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,210 8,233 $ 8,256    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 245 245 237   $ 247
Beginning liabilities for unpaid losses and loss adjustment expenses, net 7,965 7,996 8,009    
Provision for unpaid losses and loss adjustment expenses          
Current accident year 4,853 5,021 4,511    
Prior year's discount accretion 202 201 209    
Prior accident year development [1] (381) (458) (445)    
Total provision for unpaid losses and loss adjustment expenses 4,674 4,764 4,275    
Payments          
Current incurral year (2,456) (2,631) (2,288)    
Prior incurral years (2,268) (2,164) (2,000)    
Total payments (4,724) (4,795) (4,288)    
Ending liabilities for unpaid losses and loss adjustment expenses, net 7,915 7,965 7,996    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,160 8,210 8,233    
Group Insurance Policy [Member] | Group supplemental health          
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] 6 10 15    
Payments          
Ending liabilities for unpaid losses and loss adjustment expenses, net 37        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 42        
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 $ 185 $ 179 $ 178    
Group Insurance Policy [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments       $ 1