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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 22, 2022
Goodwill [Line Items]        
Impairment loss $ 0 $ 0    
Alliance Bernstein Intangible Assets        
Goodwill [Line Items]        
Gross carrying amount of intangible assets 1,200,000,000 1,200,000,000    
Accumulated amortization of these intangible assets 911,000,000 853,000,000    
Amortization of intangible assets 58,000,000 43,000,000 $ 21,000,000  
Amortization expense, year one 59,000,000      
Amortization expense, year two 59,000,000      
Amortization expense, year three 59,000,000      
Amortization expense, year four 38,000,000      
Amortization expense, year five 38,000,000      
Disposal Group, Held-for-Sale, Not Discontinued Operations | Alliance Bernstein Research Services Business        
Goodwill [Line Items]        
Disposal group, including discontinued operation, goodwill       $ 170,000,000
Investment Management        
Goodwill [Line Items]        
Goodwill $ 5,100,000,000 $ 5,100,000,000