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Debt - Revolving Credit Facility (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
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
Line of Credit    
Line of Credit Facility    
Basis spread on variable interest rate 0.10%  
Default interest rate 2.00%  
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