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Investments - Schedule of Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss        
Beginning Balance $ (75) $ (64) $ (70) $ (66)
Provision (expense) benefit for loan losses (2) (5) (7) (3)
Ending Balance (77) (69) (77) (69)
Residential Mortgage        
Financing Receivable, Allowance for Credit Loss        
Beginning Balance (58) (50) (53) (54)
Provision (expense) benefit for loan losses 0 (1) (5) 3
Ending Balance (58) (51) (58) (51)
Commercial Mortgage        
Financing Receivable, Allowance for Credit Loss        
Beginning Balance (17) (14) (17) (12)
Provision (expense) benefit for loan losses (2) (4) (2) (6)
Ending Balance $ (19) $ (18) $ (19) $ (18)