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Document and Entity Information Document
Aug. 05, 2019
Document Information [Line Items]  
Entity Central Index Key 0001039684
Document Type 8-K
Title of 12(b) Security Common stock, par value of $0.01
Entity Incorporation, State or Country Code OK
Document Period End Date Aug. 05, 2019
Entity File Number 001-13643
Entity Tax Identification Number 73-1520922
Trading Symbol OKE
Security Exchange Name NYSE
Entity Registrant Name ONEOK, Inc.
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
Entity Emerging Growth Company false
Amendment Flag false