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Basis of Financial Statements -Management Estimates (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Future policy reserves $ (3,985) $ (4,010)    
Intangibles assets (1,891) $ (1,724) $ (1,762) $ 0
Change in Accounting Method Accounted for as Change in Estimate        
Business Acquisition [Line Items]        
Future policy reserves 425      
Intangibles assets 136      
Liability for guaranteed minimum withdrawal benefit $ 28