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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Additional information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]    
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement $ 650  
Group Benefits    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] (282) $ (315)
Group Benefits | group life term, disability and accident [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] 30 65
Group Benefits | Accident and Health Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] $ 10 $ 20