ONEOK PARTNERS (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2014	Sep. 30, 2013 ONEOK Partners [Member] Distribution Regulated Segment [Member]	Sep. 30, 2014 ONEOK Partners [Member] Distribution Regulated Segment [Member]	Sep. 30, 2013 ONEOK Partners [Member] Distribution Regulated Segment [Member]	Sep. 30, 2013 ONEOK Partners [Member] Energy Services [Member]	Sep. 30, 2014 ONEOK Partners [Member] Energy Services [Member]	Sep. 30, 2013 ONEOK Partners [Member] Energy Services [Member]	Sep. 30, 2014 General Partner [Member]	Sep. 30, 2014 Limited Partner [Member]	Sep. 30, 2014 Distribution Paid [Member]	Sep. 30, 2013 Distribution Paid [Member]	Sep. 30, 2014 Distribution Paid [Member]	Sep. 30, 2013 Distribution Paid [Member]	Sep. 30, 2014 Distribution Paid [Member] ONEOK [Member]	Sep. 30, 2013 Distribution Paid [Member] ONEOK [Member]	Sep. 30, 2014 Distribution Paid [Member] ONEOK [Member]	Sep. 30, 2013 Distribution Paid [Member] ONEOK [Member]	Sep. 30, 2014 Distribution Paid [Member] General Partner [Member]	Sep. 30, 2013 Distribution Paid [Member] General Partner [Member]	Sep. 30, 2014 Distribution Paid [Member] General Partner [Member]	Sep. 30, 2013 Distribution Paid [Member] General Partner [Member]	Sep. 30, 2014 Distribution Paid [Member] Limited Partner [Member]	Sep. 30, 2013 Distribution Paid [Member] Limited Partner [Member]	Sep. 30, 2014 Distribution Paid [Member] Limited Partner [Member]	Sep. 30, 2013 Distribution Paid [Member] Limited Partner [Member]	Sep. 30, 2014 Distribution Declared [Member]	Sep. 30, 2013 Distribution Declared [Member]	Sep. 30, 2014 Distribution Declared [Member]	Sep. 30, 2013 Distribution Declared [Member]	Sep. 30, 2014 Distribution Declared [Member] ONEOK [Member]	Sep. 30, 2013 Distribution Declared [Member] ONEOK [Member]	Sep. 30, 2014 Distribution Declared [Member] ONEOK [Member]	Sep. 30, 2013 Distribution Declared [Member] ONEOK [Member]	Sep. 30, 2014 Distribution Declared [Member] General Partner [Member]	Sep. 30, 2013 Distribution Declared [Member] General Partner [Member]	Sep. 30, 2014 Distribution Declared [Member] General Partner [Member]	Sep. 30, 2013 Distribution Declared [Member] General Partner [Member]	Sep. 30, 2014 Distribution Declared [Member] Limited Partner [Member]	Sep. 30, 2013 Distribution Declared [Member] Limited Partner [Member]	Sep. 30, 2014 Distribution Declared [Member] Limited Partner [Member]	Sep. 30, 2013 Distribution Declared [Member] Limited Partner [Member]	Sep. 30, 2014 Issued Under Public Offering [Member]	Sep. 30, 2013 Issued Under Public Offering [Member]	Sep. 30, 2014 Paid-in Capital [Member]	Sep. 30, 2014 Issued Under Equity Distribution Agreement [Member]	Mar. 31, 2013 Issued Under Equity Distribution Agreement [Member]	Sep. 30, 2014 Issued Under Equity Distribution Agreement [Member]	Sep. 30, 2014 ONEOK [Member]	Sep. 30, 2013 ONEOK [Member]	Sep. 30, 2014 ONEOK [Member]	Sep. 30, 2013 ONEOK [Member]	Sep. 30, 2014 Partnership Credit Agreement [Member]	Dec. 31, 2014 West Texas LPG Acquisition [Member] Subsequent Event [Member]	Sep. 30, 2014 Sage Creek Acquisition [Member]	Dec. 31, 2013 Sage Creek Acquisition [Member]	Sep. 30, 2014 Sage Creek Acquisition [Member] Natural Gas Gathering And Processing [Member]	Sep. 30, 2014 Sage Creek Acquisition [Member] Natural Gas Liquids [Member]
Related Party Transaction [Line Items]
Payments to Acquire Businesses, Gross																																																											$ 800,000,000
Maximum Amount Of Commercial Paper	1,700,000,000			1,700,000,000			1,200,000,000
Public offering price of common units	$ 52.94	$ 49.61
Partners' Capital Account, Units, Sold in Public Offering	13,900,000	11,500,000
Ownership interest (in hundreths)														2.00%	36.30%
Related Party Transaction, Other Revenues from Transactions with Related Party								17,700,000	7,500,000	45,800,000	63,600,000	46,000,000	209,500,000
Distribution Made to Limited Partner, Distribution Date																																Nov. 14, 2014
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest				38.30%		41.20%
Proceeds from Sale of Interest in Partnership Unit																																																714,500,000	553,400,000		81,300,000	16,300,000	245,400,000
Partners' Capital Account, Contributions	15,000,000	11,600,000
Maximum borrowing capacity																																																										1,700,000,000
Common units	19,800,000			19,800,000
Class B units	73,000,000			73,000,000
Distribution per unit																$ 0.760	$ 0.720	$ 2.235	$ 2.145													$ 0.775	$ 0.725	$ 2.280	$ 2.160
Distribution Made To Member Or Limited Parter Annualized Quarterly Distribution																																3.10
Distribution Made To Member Or Limited Parter Change From Prior Quarter																																0.015
General partner distributions																								5,501,000	4,512,000	15,361,000	13,399,000													5,683,000	4,795,000	16,195,000	13,776,000
Distributions to general partner																85,882,000	67,146,000	235,908,000	198,046,000													90,135,000	71,812,000	252,939,000	205,002,000
Incentive distributions																								80,381,000	62,634,000	220,547,000	184,647,000													84,452,000	67,017,000	236,744,000	191,226,000
Limited partner distributions to ONEOK																				70,519,000	66,807,000	207,381,000	199,031,000													71,911,000	67,271,000	211,557,000	200,422,000
Limited partner distributions to noncontrolling interest																												118,644,000	91,676,000	324,805,000	272,904,000													122,105,000	100,650,000	345,255,000	283,365,000
Total distributions																275,045,000	225,629,000	768,094,000	669,981,000													284,151,000	239,733,000	809,751,000	688,789,000
Revenue																																																						0	81,324,000	53,526,000	255,298,000
Expenses
Cost of sales and fuel																																																						0	9,562,000	10,835,000	27,855,000
Administrative and general expenses																																																						84,221,000	58,549,000	240,172,000	192,906,000
Total expenses																																																						84,221,000	68,111,000	251,007,000	220,761,000
Distribution Made to Limited Partner, Date of Record																																Nov. 03, 2014
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	73,263,000	501,893,000		877,658,000	516,201,000																																													138,310,000
Partners capital account units sold under equity distribution agreement	1,400,000		300,000	4,400,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest																																																													305,000,000	152,000,000	153,000,000
Goodwill																																																												$ 92,000,000