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RELATED PARTY TRANSACTIONS - Investment Management and Service Fees Related to AB (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Investment management and service fees $ 4,820 $ 4,891 $ 5,395
Alliance Bernstein | Related Party | Investment Management And Related Services      
Related Party Transaction [Line Items]      
Investment management and service fees 1,378 1,453 1,645
Distribution revenues 576 591 637
Other revenues - shareholder servicing fees 76 79 86
Other revenues - other 9 8 8
Total $ 2,039 $ 2,131 $ 2,376