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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 6,040 $ 5,727    
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 (56) (12) $ (12) $ (11)
Mortgage loans on real estate (net of allowances of $56 and $12) 5,974 5,706    
Apartment        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 868 $ 766    
Percentage of total 14.40% 13.40%    
Retail        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,705 $ 1,686    
Percentage of total 28.20% 29.40%    
Office building        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,773 $ 1,771    
Percentage of total 29.40% 31.00%    
Industrial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,253 $ 1,169    
Percentage of total 20.70% 20.40%    
Other commercial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 441 $ 335    
Percentage of total 7.30% 5.80%