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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 7,320   $ 6,653      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (15)   (12)      
Allowance for Loan and Lease Losses, Real Estate (74) $ (57) (51) $ (43) $ (38) $ (35)
Mortgage loans on real estate (net of valuation allowances) $ 7,231   $ 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 $ 1,716   $ 1,706      
Percentage of total 23.40%   25.60%      
Retail            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 2,445   $ 2,290      
Percentage of total 33.40%   34.40%      
Industrial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,820   $ 1,518      
Percentage of total 24.90%   22.80%      
Apartment            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 870   $ 763      
Percentage of total 11.90%   11.50%      
Other commercial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 469   $ 376      
Percentage of total 6.40%   5.70%