Business Segment Information - Additional Information (Details) - segment	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Number of operating segments	1
Customer Concentration Risk \| HSBC
Major Customers [Abstract]
Percentage of open-end mutual fund sales	4.00%	6.00%	14.00%
Customer Concentration Risk \| EQH, Equitable Life And Subsidiaries
Major Customers [Abstract]
Percentage of total revenues from general and separate accounts of affiliates	3.00%	3.00%	3.00%
Customer Concentration Risk \| EQH
Major Customers [Abstract]
Percentage of total revenues from unaffiliated customer (more than)	2.00%	2.00%	2.00%

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- Definition

Percentage of open ended mutual fund sales that companies are responsible. (open ended mutual fund does not have restrictions on the amount of shares the fund will issue)

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No definition available.

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- Definition

Percentage amount of total revenue deriving from affiliated companies general and separate accounts.

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No definition available.

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- Definition

Maximum percentage amount of total revenue deriving from customers other than affiliated clients.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

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