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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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 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 32,973  
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 1,150 1,185
Prior year's discount accretion 58 62
Prior incurral year development (120) (127)
Total provision for unpaid losses and loss adjustment expenses 1,088 1,120
Less: payments    
Current incurral year 314 318
Prior incurral years 855 840
Total payments 1,169 1,158
Ending liabilities for unpaid losses and loss adjustment expenses, net 8,125 8,265
Reinsurance recoverables 237 233
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,362 8,498
Other Operating Income (Expense) [Member] | Group Insurance Policies [Member]    
Provision for unpaid losses and loss adjustment expense    
Total provision for unpaid losses and loss adjustment expenses $ 46 $ 41