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SUBSEQUENT EVENTS (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
ONE Gas [Member]
Subsequent Event [Member]
Jan. 31, 2014
ONE Gas [Member]
Subsequent Event [Member]
Jan. 31, 2014
ONE Gas [Member]
2.07% notes due February 1, 2019
Jan. 31, 2014
ONE Gas [Member]
2.07% notes due February 1, 2019
Subsequent Event [Member]
Jan. 31, 2014
ONE Gas [Member]
3.61% notes due February 1, 2024
Jan. 31, 2014
ONE Gas [Member]
3.61% notes due February 1, 2024
Subsequent Event [Member]
Jan. 31, 2014
ONE Gas [Member]
4.658% notes due February 1, 2044
Jan. 31, 2014
ONE Gas [Member]
4.658% notes due February 1, 2044
Subsequent Event [Member]
Dec. 31, 2013
Parent Company [Member]
Dec. 31, 2012
Parent Company [Member]
Dec. 31, 2013
Parent Company [Member]
Note Payable from Public Offering Due 2022 [Member]
Dec. 31, 2012
Parent Company [Member]
Note Payable from Public Offering Due 2022 [Member]
Mar. 31, 2014
Parent Company [Member]
Note Payable from Public Offering Due 2022 [Member]
Subsequent Event [Member]
Dec. 31, 2013
Parent Company [Member]
Notes Payables due 2015 [Member]
Dec. 31, 2012
Parent Company [Member]
Notes Payables due 2015 [Member]
Mar. 31, 2014
Parent Company [Member]
Notes Payables due 2015 [Member]
Subsequent Event [Member]
Mar. 31, 2014
ONEOK [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                                      
Extinguishment of Debt, Amount                             $ 152,500,000     $ 400,000,000  
Long-term Debt, Gross 7,754,857,000 6,512,519,000   1,200,000,000   300,000,000 300,000,000 300,000,000 600,000,000 600,000,000 1,687,649,000 1,687,662,000 700,000,000 700,000,000   400,000,000 400,000,000    
Related Party Transaction, Amounts of Transaction     1,130,000,000                                
Debt Instrument, Interest Rate, Stated Percentage         2.07%     3.61%   4.658%     4.25%     5.20%      
Early Repayment of Senior Debt                             150,000,000     429,000,000  
Repayments of Commercial Paper                                     $ 600,500,000