Related Party Transactions - Summary of Revenues, Expenses and Balance Sheet Items for EQH and Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Other revenues	$ 134,192	$ 142,794	$ 101,342
Total revenues	4,593,648	4,559,652	4,262,864
Expenses:
General and administrative	557,032	599,215	581,571
Other	162,611	182,146	215,643
Total expenses	3,480,177	3,351,066	3,337,653
Statement of Financial Condition:
Institutional investment advisory and services fees receivable	139,755	159,336
Other due (to) from EQH and its subsidiaries	(271,155)	(259,318)
Equitable Holdings, Inc. And Subsidiaries
Revenues:
Other revenues	574	566	617
Total revenues	201,915	181,077	166,365
Expenses:
General and administrative	2,113	2,362	2,909
EQH Facility Interest	16,670	25,976	37,304
Other	4,000	3,469	2,949
Total expenses	26,553	35,452	46,654
Statement of Financial Condition:
Institutional investment advisory and services fees receivable	11,462	35,515
Prepaid expenses	513	543
Other due (to) from EQH and its subsidiaries	(2,835)
Other due (to) from EQH and its subsidiaries		(2,800)
EQH Facility	(810,000)	(710,000)
Total	(800,860)	(676,742)
Investment advisory and services fees
Revenues:
Investment advisory and services fees	3,531,490	3,442,139	2,975,468
Investment advisory and services fees | Equitable Holdings, Inc. And Subsidiaries
Revenues:
Investment advisory and services fees	201,341	180,511	165,748
Distribution revenues
Revenues:
Investment advisory and services fees	818,444	726,670	586,263
Expenses:
Commissions and distribution payments to financial intermediaries	813,188	742,429	610,368
Distribution revenues | Equitable Holdings, Inc. And Subsidiaries
Expenses:
Commissions and distribution payments to financial intermediaries	$ 3,770	$ 3,645	$ 3,492