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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Additional information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 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] (382) $ (362)
Group Benefits | group life term, disability and accident [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] 50 50
Group Benefits | Accident and Health Insurance Product Line [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] 10 19
Group Benefits | Disability Insurance Policy [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior incurral year development [2] $ 320 $ 293