Document and Entity Information Document
Jul. 07, 2022
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 07, 2022
Entity Registrant Name ONEOK, Inc.
Entity Incorporation, State or Country Code OK
Entity File Number 001-13643
Entity Tax Identification Number 73-1520922
Entity Address, Address Line One 100 West Fifth Street
Entity Address, City or Town Tulsa
Entity Address, State or Province OK
Entity Address, Postal Zip Code 74103
City Area Code 918
Local Phone Number 588-7000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value of $0.01
Trading Symbol OKE
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0001039684
Amendment Flag false