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Document and Entity Information
Feb. 11, 2020
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001587732
Document Type 8-K
Document Period End Date Feb. 11, 2020
Entity Registrant Name ONE Gas, Inc.
Entity Incorporation State Country Code OK
Entity File Number 001-36108
Entity Tax Identification Number 46-3561936
Entity Address, Address Line One 15 East 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 947-7000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol OGS
Security Exchange Name NYSE
Entity Emerging Growth Company false