Related Party Transactions - Schedule of Revenues, Expenses and Balance Sheet Items for EQH and Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Other revenues	$ 142,794	$ 101,342	$ 105,544
Total revenues	4,559,652	4,262,864	4,120,728
Expenses:
General and administrative	599,215	581,571	641,635
Other	182,146	215,643	215,556
Total expenses	3,351,066	3,337,653	3,239,194
Statement of Financial Condition:
Institutional investment advisory and services fees receivable	159,336	125,500
Other due (to) from EQH and its subsidiaries	259,318	216,213
Equitable Holdings, Inc. And Subsidiaries
Revenues:
Other revenues	566	617	688
Total revenues	181,077	166,365	149,065
Expenses:
General and administrative	2,362	2,909	2,882
EQH Facility Interest	25,976	37,304	11,372
Other	3,469	2,949	2,697
Total expenses	35,452	46,654	20,848
Statement of Financial Condition:
Institutional investment advisory and services fees receivable	35,515	9,055
Prepaid expenses	543	709
Other due (to) from EQH and its subsidiaries	(2,800)
Other due (to) from EQH and its subsidiaries		4,719
EQH Facility	(710,000)	(900,000)
Total	(676,742)	(885,517)
Investment advisory and services fees
Revenues:
Investment advisory and services fees	3,442,139	2,975,468	2,971,038
Investment advisory and services fees | Equitable Holdings, Inc. And Subsidiaries
Revenues:
Investment advisory and services fees	180,511	165,748	148,377
Distribution revenues
Revenues:
Investment advisory and services fees	726,670	586,263	607,195
Expenses:
Commissions and distribution payments to financial intermediaries	742,429	610,368	629,572
Distribution revenues | Equitable Holdings, Inc. And Subsidiaries
Expenses:
Commissions and distribution payments to financial intermediaries	$ 3,645	$ 3,492	$ 3,897