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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets, Deferred Sales Commissions, Net and Capitalized Computer Software and Hosting Arrangements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Computer software and hosting arrangements $ 122 $ 163  
Amortization of computer software and hosting arrangements $ 41 53 $ 45
Computer Software, Intangible Asset | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 3 years    
Computer Software, Intangible Asset | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 5 years    
Non-US Fund Shares Deferred Sales Commissions, Net      
Finite-Lived Intangible Assets [Line Items]      
Capitalized contract cost, amortization period 4 years    
US Fund Shares Deferred Sales Commissions, Net      
Finite-Lived Intangible Assets [Line Items]      
Capitalized contract cost, amortization period 5 years 6 months    
Alliance Bernstein | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 6 years    
Alliance Bernstein | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 20 years    
Alliance Bernstein | Deferred Sales Commissions      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of intangible assets $ 183 $ 87  
Amortization expense, year two 76    
Amortization expense, year three 68    
Amortization expense, year four $ 37