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Mortgage Loans on Real Estate - Mortgage Loan Portfolio Summary (Details) - Mortgage loans on real estate, at amortized cost - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]            
Amortized cost $ 11,954   $ 5,711      
Allowance for credit losses (88) $ (54) (53) $ (31) $ (43) $ (38)
Commercial mortgage loans, carrying value 11,866   5,658      
Commercial Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Principal outstanding 9,674   5,870      
Deferred fees and costs, net (18)   (72)      
Unamortized discounts and premiums, net (487)   (87)      
Amortized cost 9,169   5,711      
Allowance for credit losses (80) (54) (53) (31) (43) (38)
Commercial mortgage loans, carrying value 9,089   5,658      
Residential Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Principal outstanding 2,873   57      
Deferred fees and costs, net 0   (57)      
Unamortized discounts and premiums, net (88)   0      
Amortized cost 2,785   0      
Allowance for credit losses (8) $ 0 0 $ 0 $ 0 $ 0
Commercial mortgage loans, carrying value $ 2,777   $ 0