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Business, Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
segment
Business Combination [Line Items]  
Number of operating segments | segment 3
OneAmerica  
Business Combination [Line Items]  
Other cash payments for acquisition $ 160
OneAmerica  
Business Combination [Line Items]  
Cash purchase consideration $ 50