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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 33,029  
Less: payments    
Ending liabilities for unpaid losses and loss adjustment expenses, gross 36,104  
Group Insurance Policies [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,445 $ 8,512
Reinsurance recoverables 239 209
Beginning liabilities for unpaid losses and loss adjustment expenses, net 8,206 8,303
Provision for unpaid losses and loss adjustment expense    
Current incurral year 2,269 2,317
Prior year's discount accretion 117 120
Prior incurral year development (206) (217)
Total provision for unpaid losses and loss adjustment expenses 2,180 2,220
Less: payments    
Current incurral year 922 974
Prior incurral years 1,342 1,335
Total payments 2,264 2,309
Ending liabilities for unpaid losses and loss adjustment expenses, net 8,122 8,214
Reinsurance recoverables 234 235
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,356 8,449
Group Insurance Policies [Member] | Other Operating Income (Expense) [Member]    
Provision for unpaid losses and loss adjustment expense    
Total provision for unpaid losses and loss adjustment expenses $ 85 $ 85