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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 36,517        
Payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross 37,855 $ 36,517      
Group Insurance Policy [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,256 8,445 $ 8,512    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 237 247 239   $ 209
Beginning liabilities for unpaid losses and loss adjustment expenses, net 8,009 8,206 8,303    
Provision for unpaid losses and loss adjustment expenses          
Current accident year 4,511 4,385 4,470    
Prior year's discount accretion 209 219 227    
Prior accident year development [1] (445) (410) (324)    
Total provision for unpaid losses and loss adjustment expenses 4,275 4,194 4,373    
Payments          
Current incurral year (2,288) (2,277) (2,377)    
Prior incurral years (2,000) (2,114) (2,135)    
Total payments (4,288) (4,391) (4,512)    
Ending liabilities for unpaid losses and loss adjustment expenses, net 7,996 8,009 8,206    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,233 8,256 8,445    
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 178 178 194    
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  
Group Insurance Policy [Member] | Aetna Group Insurance [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Add: Aetna U.S. group life and disability business acquisitions $ 0 $ 0 $ 42