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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, 2021
Jun. 30, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 37,855        
Less: payments          
Ending liabilities for unpaid losses and loss adjustment expenses, gross 38,702        
Group Insurance Policy [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 8,233 $ 8,256      
Reinsurance recoverables [1] 250 244 $ 237   $ 246
Beginning liabilities for unpaid losses and loss adjustment expenses, net 7,996 8,010      
Provision for unpaid losses and loss adjustment expense          
Current incurral year 2,464 2,297      
Prior year's discount accretion 106 111      
Prior incurral year development [2] (282) (315)      
Total provision for unpaid losses and loss adjustment expenses 2,288 2,093      
Less: payments          
Current incurral year (1,000) (871)      
Prior incurral years (1,414) (1,290)      
Total payments (2,414) (2,161)      
Beginning liabilities for unpaid losses and loss adjustment expenses, net 7,870 7,942 $ 7,996   $ 8,010
Ending liabilities for unpaid losses and loss adjustment expenses, gross 8,120 8,186      
Group Insurance Policy [Member] | Disability Insurance Policy [Member]          
Provision for unpaid losses and loss adjustment expense          
Prior incurral year development [2] 240 230      
Group Insurance Policy [Member] | group life term, disability and accident [Member]          
Provision for unpaid losses and loss adjustment expense          
Prior incurral year development [2] 30 65      
Group Insurance Policy [Member] | Accident and Health Insurance Product Line [Member]          
Provision for unpaid losses and loss adjustment expense          
Prior incurral year development [2] 10 20      
Group Insurance Policy [Member] | Other Operating Income (Expense) [Member]          
Provision for unpaid losses and loss adjustment expense          
Total provision for unpaid losses and loss adjustment expenses $ 87 $ 89      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] | Group Insurance Policy [Member] | Accounting Standards Update 2016-13 [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Reinsurance recoverables [1]       $ (1)