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Business and Summary of Significant Accounting Policies - Owned Distribution Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Commissions $ 2,008 $ 3,064 $ 3,821
Affiliate      
Related Party Transaction [Line Items]      
Commissions $ 154 $ 74