Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Feb. 21, 2014
Feb. 03, 2014
Document Information [Line Items]      
Entity Registrant Name ONE Gas, Inc.    
Entity Central Index Key 0001587732    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status No [1]    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1.7 [2]
Entity Common Stock, Shares Outstanding   51,941,236  
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2013    
[1] The registrant became subject to such requirement on January 10, 2014, and it has filed all reports so required since that date.
[2] The aggregate market value of the equity securities held by non-affiliates of the registrant on February 3, 2014, based upon the closing price of $33.63 of the registrant’s common stock as reported on the New York Stock Exchange was approximately $1.7 billion. The registrant has elected to use February 3, 2014 as the calculation date, which was the initial regular-way trading date of the registrant’s common stock on the New York Stock Exchange, since on June 30, 2013 (the last business day of the registrant’s second fiscal quarter), the registrant had not yet been incorporated.

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