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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 6,895 $ 6,653    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (14) (12)    
Allowance for Loan and Lease Losses, Real Estate (48) (51) $ (37) $ (35)
Mortgage loans on real estate (net of valuation allowances) $ 6,833 $ 6,590    
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 $ 1,710 $ 1,706    
Percentage of total 24.80% 25.60%    
Retail        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 2,319 $ 2,290    
Percentage of total 33.60% 34.40%    
Industrial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 1,602 $ 1,518    
Percentage of total 23.30% 22.80%    
Apartment        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 835 $ 763    
Percentage of total 12.10% 11.50%    
Other commercial        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Recorded investment $ 429 $ 376    
Percentage of total 6.20% 5.70%