Cover Page

12 Months Ended

Dec. 31, 2019

USD ($)

shares

Cover page.

Document Type

10-K

Document Annual Report

true

Document Period End Date

Dec. 31, 2019

Document Transition Report

false

Entity File Number

000-29961

Entity Registrant Name

ALLIANCEBERNSTEIN L.P.

Entity Incorporation, State or Country Code

DE

Entity Tax Identification Number

13-4064930

Entity Address, Address Line One

1345 Avenue of the Americas

Entity Address, City or Town

New York

Entity Address, State or Province

NY

Entity Address, Postal Zip Code

10105

City Area Code

212

Local Phone Number

969-1000

Title of 12(g) Security

Units of Limited Partnership Interest

Entity Well-known Seasoned Issuer

Yes

Entity Voluntary Filers

No

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Non-accelerated Filer

Entity Small Business

false

Entity Emerging Growth Company

false

Entity Shell Company

false

Entity Common Stock, Shares Outstanding | shares

270,380,314

Documents Incorporated by Reference

This Form 10-K does not incorporate any document by reference.

Entity Central Index Key

0001109448

Current Fiscal Year End Date

--12-31

Document Fiscal Year Focus

2019

Document Fiscal Period Focus

FY

Amendment Flag

false

Entity Public Float | $

$ 0