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Investments (Mortgage Loans by Property Type) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Document Period End Date Sep. 30, 2022          
Recorded investment $ 6,613   $ 6,329      
Percentage of total 100.00%   100.00%      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (12)   $ (11)      
Allowance for Loan and Lease Losses, Real Estate (43) $ (38) (35) $ (39) $ (45) $ (64)
Mortgage loans (net of allowance for credit losses of $43 and $35) 6,558   6,283      
Apartment            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 751   $ 801      
Percentage of total 11.40%   12.70%      
Retail            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 2,317   $ 2,090      
Percentage of total 35.00%   33.00%      
Office building            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,727   $ 1,683      
Percentage of total 26.10%   26.60%      
Industrial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 1,431   $ 1,249      
Percentage of total 21.60%   19.70%      
Other commercial            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Recorded investment $ 387   $ 506      
Percentage of total 5.90%   8.00%