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SHARE-BASED COMPENSATION PROGRAMS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) tranche shares	Dec. 31, 2023 USD ($) tranche shares	Dec. 31, 2022 USD ($) tranche shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)	0	0	0
Alliance Bernstein
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)	4,500,000	4,700,000	5,200,000
Payments for repurchase of other equity \| $	$ 156,000	$ 144,000	$ 212,000
Open market purchases (in shares)	1,800,000	2,000,000.0	2,300,000
Open-market purchases, value \| $	$ 60,100	$ 62,600	$ 92,700
Proceeds from options exercised \| $			$ 100
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted (in shares)	1,444,000
Unvested restricted shares and holding units (in shares)	2,700,000
Compensation cost not yet recognized \| $	$ 35,000
Compensation cost, recognition period	1 year 7 months 6 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)	0
Stock Options \| Vesting tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	33.33%
Stock Options \| Vesting tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	33.33%
Stock Options \| Vesting tranche three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	33.33%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of tranches \| tranche	2	1	1
Unvested restricted shares and holding units (in shares)	1,300,000
Compensation cost not yet recognized \| $	$ 14,000
Compensation cost, recognition period	1 year 6 months
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential shares earned	0.00%	0.00%	0.00%
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential shares earned	200.00%	200.00%	200.00%
Performance Shares \| Vesting tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	50.00%
Performance Shares \| Vesting tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	50.00%
AB Holding Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	24,000,000	27,000,000
Unvested restricted shares and holding units (in shares)	12,000,000
Compensation cost not yet recognized \| $	$ 94,000
Compensation cost, recognition period	5 years 4 months 24 days
AB Holding Units \| Alliance Bernstein
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued (in shares)	0	0	6,000
Restricted AB Holding Units \| Alliance Bernstein
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	5,900,000	5,600,000	4,700,000
Omnibus Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved and available for issuance (in shares)	17,000,000
2017 Plan \| AB Holding Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved and available for issuance (in shares)	60,000,000
Shares available for grant (in shares)	36,000,000	33,000,000
2017 Plan \| Newly Issued AB Holding Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved and available for issuance (in shares)	30,000,000