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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 6,583 $ 6,329    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (11) (11)    
Allowance for Loan and Lease Losses, Real Estate (37) (35) $ (47) $ (64)
Mortgage loans on real estate (net of valuation allowances) $ 6,535 $ 6,283    
Percentage of total 100.00% 100.00%    
Office building        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,699 $ 1,683    
Percentage of total 25.90% 26.60%    
Retail        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 2,227 $ 2,090    
Percentage of total 33.80% 33.00%    
Industrial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,451 $ 1,249    
Percentage of total 22.00% 19.70%    
Apartment        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 859 $ 801    
Percentage of total 13.00% 12.70%    
Other commercial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 347 $ 506    
Percentage of total 5.30% 8.00%