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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 32,287    
Less: payments      
Ending liabilities for unpaid losses and loss adjustment expenses, gross 33,029 $ 32,287  
Reinsurance recoverables, net 4,357 4,061  
Group Insurance Policies      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,512 5,772 $ 5,889
Reinsurance and other recoverables 209 208 218
Beginning liabilities for unpaid losses and loss adjustment expenses, net 8,303 5,564 5,671
Provision for unpaid losses and loss adjustment expenses      
Current accident year 4,470 2,868 2,562
Prior year's discount accretion 227 202 202
Prior accident year development (324) (185) (162)
Total provision for unpaid losses and loss adjustment expenses 4,373 2,885 2,602
Less: payments      
Current incurral year 2,377 1,528 1,327
Prior incurral years 2,135 1,451 1,382
Total payments 4,512 2,979 2,709
Ending liabilities for unpaid losses and loss adjustment expenses, net 8,206 8,303 5,564
Reinsurance and other recoverables 239 209 208
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,445 8,512 5,772
Reinsurance recoverables, net 194 111 100
Aetna Group Insurance [Member] | Group Insurance Policies      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Add: Aetna U.S. group life and disability business acquisitions $ 42 $ 2,833 $ 0