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Debt - Revolving Credit Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Nov. 25, 2024
Revolving Credit Facility      
Line of Credit Facility      
Current borrowing capacity for line of credit facility     $ 1,000
Maximum borrowing capacity for line of credit facility     $ 1,250
Line of credit borrowings outstanding $ 0 $ 0  
Outstanding letters of credit issued against line of credit facility 1 1  
American Enterprise Investment Services, Incorporated      
Line of Credit Facility      
Maximum borrowing capacity for line of credit facility 500    
Line of credit borrowings outstanding $ 0 $ 0