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Investments (excluding Consolidated Investment Entities) - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]          
Single issuer in excess of total equity $ 0   $ 0    
Initial collateral required, percent of market value of loaned securities     102.00%    
Intent impairments 0 $ 1,000,000 $ 19,000,000 $ 6,000,000  
Targeted maximum amount of mortgage loans lended, percent of estimated fair value of underlying real estate     75.00%    
Loans on non-accrual status 71,000,000   $ 71,000,000   $ 26,000,000
Nonaccrual, interest income     0   0
Fixed maturity securities on non-accrual status 71,000,000   71,000,000   26,000,000
Fixed maturities          
Financing Receivable, Nonaccrual [Line Items]          
Loans on non-accrual status 5,000,000   5,000,000   18,000,000
Fixed maturity securities on non-accrual status $ 5,000,000   $ 5,000,000   $ 18,000,000
Private placement debt          
Financing Receivable, Nonaccrual [Line Items]          
Threshold period past due, nonaccrual 90 days   90 days    
Minimum          
Financing Receivable, Nonaccrual [Line Items]          
Fixed maturities average duration 6 years   6 years    
Maximum          
Financing Receivable, Nonaccrual [Line Items]          
Fixed maturities average duration 6 years 6 months   6 years 6 months