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Mortgage Loans on Real Estate - Valuation Allowance Rollforward (Details) - Mortgage loans on real estate, at amortized cost - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance $ (54) $ (43) $ (53) $ (38)
Acquisition from business combination 0 0 0 0
Provision (34) 12 (35) 7
Writeoffs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 0 0 0
Ending balance (88) (31) (88) (31)
Commercial Mortgage        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance (54) (43) (53) (38)
Acquisition from business combination 0 0 0 0
Provision (26) 12 (27) 7
Writeoffs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 0 0 0
Ending balance (80) (31) (80) (31)
Residential Mortgage        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 0 0 0 0
Acquisition from business combination 0 0 0 0
Provision (8) 0 (8) 0
Writeoffs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 0 0 0
Ending balance $ (8) $ 0 $ (8) $ 0