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Deferred Policy Acquisition Costs and Value of Business Acquired - Reconciliation of DAC and VOBA (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Deferred Acquisition Cost and Value of Business Acquired [Line Items]      
VOBA $ 724 $ 376 $ 406
Deferred policy acquisition costs ("DAC") and Value of business acquired ("VOBA") 2,435 2,148  
Retirement Deferred Group and Individual Annuity      
Deferred Acquisition Cost and Value of Business Acquired [Line Items]      
DAC 704 701 695
Health Solutions      
Deferred Acquisition Cost and Value of Business Acquired [Line Items]      
DAC 222 215 193
Businesses Exited      
Deferred Acquisition Cost and Value of Business Acquired [Line Items]      
DAC 767 838 $ 938
Other      
Deferred Acquisition Cost and Value of Business Acquired [Line Items]      
DAC $ 18 $ 18