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Basis of Financial Statements - Owned Distribution Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Distribution Investments And Affiliates | Commission Fees Paid        
Business Acquisition [Line Items]        
Payments for commissions $ 44 $ 40 $ 94 $ 77