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Mortgage Loans on Real Estate - Mortgage Loan Portfolio Summary (Details) - Mortgage loans on real estate, net of allowance - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total $ 11,224     $ 12,272        
Allowance for credit losses (134)     (155)        
Total, net of allowance 11,090     12,117        
Commercial mortgage loans                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total 8,716     9,576        
Allowance for credit losses (125) $ (125) $ (144) (146) $ (80) $ (54) $ (54) $ (53)
Residential mortgage loans                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total 2,508     2,696        
Allowance for credit losses $ (9) $ (13) $ (10) $ (9) $ (8) $ 0 $ 0 $ 0