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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 5,861 $ 5,727    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (10) $ (9)    
Allowance for Loan and Lease Losses, Real Estate (64) (12) $ (11) $ (9)
Mortgage loans on real estate 5,787 5,706    
Office Building [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 1,702 $ 1,771    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 29.00% 31.00%    
Retail Site [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 1,711 $ 1,686    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 29.30% 29.40%    
Industrial Property [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 1,210 $ 1,169    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 20.60% 20.40%    
Apartment Building [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 808 $ 766    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.80% 13.40%    
Other Property [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 430 $ 335    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.30% 5.80%