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Cover
Feb. 24, 2021
Document Information [Line Items]  
Document Type 8-K
Entity Registrant Name ONE Gas, Inc.
Document Period End Date Feb. 24, 2021
Entity Central Index Key 0001587732
Pre-commencement Issuer Tender Offer false
Amendment Flag false
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
Security Exchange Name NYSE
Trading Symbol OGS
Title of 12(b) Security Common Stock, par value $0.01 per share
Entity Emerging Growth Company false
Entity Tax Identification Number 46-3561936
Entity File Number 001-36108
Entity Incorporation, State or Country Code OK