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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans Receivable, Gross, Commercial, Real Estate $ 6,329 $ 5,861    
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 $ (11) $ (10)    
Allowance for Loan and Lease Losses, Real Estate (35) (64) $ (12) $ (11)
Mortgage loans on real estate 6,283 5,787    
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 $ 1,683 $ 1,702    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 26.60% 29.00%    
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 $ 2,090 $ 1,711    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 33.00% 29.30%    
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 $ 1,249 $ 1,210    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 19.70% 20.60%    
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 $ 801 $ 808    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.70% 13.80%    
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 $ 506 $ 430    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.00% 7.30%