Related Party Transactions - Summary of Revenues, Expenses and Balance Sheet Items for EQH and Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Other revenues	$ 105,544	$ 108,409	$ 104,703
Total revenues	4,120,728	4,445,288	3,724,186
Expenses:
General and administrative	641,635	555,608	491,070
Other	215,556	197,486	189,787
Total expenses	3,239,194	3,225,140	2,801,100
Balance Sheet:
Institutional investment advisory and services fees receivable	127,040	185,653
EQH
Revenues:
Other revenues	688	675	1,330
Total revenues	149,065	133,749	117,231
Expenses:
General and administrative	2,882	2,373	2,281
Other	14,069	3,953	5,463
Total expenses	20,848	10,876	11,696
Balance Sheet:
Institutional investment advisory and services fees receivable	7,732	8,607
Prepaid expenses	385	545
Other due to EQH and its subsidiaries	(4,206)	(1,534)
EQH Facility	(990,000)	(755,000)
Total	(986,089)	(747,382)
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	2,971,038	3,194,524	2,595,436
Investment advisory and services fees | EQH
Revenues:
Revenue subject to contracts with customers	148,377	133,074	115,901
Distribution related
Revenues:
Revenue subject to contracts with customers	607,195	652,240	529,781
Expenses:
Commissions and distribution payments to financial intermediaries	629,572	708,117	569,283
Distribution related | EQH
Expenses:
Commissions and distribution payments to financial intermediaries	$ 3,897	$ 4,550	$ 3,952