Stock Repurchased During Period Price Per Share

No definition available.

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Namespace Prefix:	ab_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

+ Details

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Namespace Prefix:	srt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of general partner units outstanding.

+ References

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-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-SubTopic 10
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+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Name Accounting Standards Codification
-Section 50
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+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=ab_ABHoldingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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Business Description, Organization and Basis of Presentation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 03, 2025	Mar. 31, 2025	Mar. 31, 2024
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Total amount of AB Holding units purchased (in shares)		800,000	100,000
Aggregate purchase price		$ 30.5	$ 4.3
Subsequent Event \| Tender Offer
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Cash tender offer to purchase up to (in shares)	46,000,000
Stock repurchased during period (in dollars per share)	$ 38.50
Cash tender offer, authorized amount to repurchase	$ 1,800.0
Total amount of AB Holding units purchased (in shares)	19,682,946
Aggregate purchase price	$ 757.8
AB Holding \| Subsequent Event
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Economic interest, percentage	17.90%
AB Holding \| AB
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
General partnership interest in company (percent)		1.00%
AB Holding \| AB \| General Partnership Interest
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
General Partnership number of general partnership units owned in holding company (in shares)		100,000
AB \| Subsequent Event
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Economic interest, percentage	68.50%
AB \| AB \| General Partnership Interest
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
General partnership interest in company (percent)		1.00%
AB \| EQH and its subsidiaries \| General and Limited Partnership Interests
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
General partnership interest in company (percent)		61.90%