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 |