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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 |  |

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