Fair Value - Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Balance as of beginning of period	$ 249,854	$ 42,436	$ 247,309	$ 38,260
Addition	0	227,071	0	229,571
Accretion	2,249	3,638	7,136	5,314
Change in estimate	13,115	0	13,115	0
Payments	0	0	(792)	0
Held for sale reclassification	(13,696)	0	(15,246)	0
Balance as of end of period	251,522	$ 273,145	$ 251,522	$ 273,145
Autonomous LLC
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Change in estimate	$ 13,100

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion

No definition available.

Name:	ab_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAccretion
Namespace Prefix:	ab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Held For Sale Reclassification

+ References

No definition available.

+ Details

Name:	ab_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityHeldForSaleReclassification
Namespace Prefix:	ab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Increase (Decrease) In Estimates

+ References

No definition available.

+ Details

Name:	ab_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIncreaseDecreaseInEstimates
Namespace Prefix:	ab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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.

+ References

No definition available.

+ Details

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

- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ab_AutonomousLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: