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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Income Statement and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,263,228			$ 3,393,890			$ 7,500,761	$ 9,456,496
Cost of sales and fuel (exclusive of items shown separately below)	1,414,528			2,560,765			4,996,699	7,104,609
(Gain) loss on sale of assets	(16)			(163)			2,882	(348)
Operating income	482,151			495,534			1,427,039	1,363,599
Equity in net earnings from investments	37,576			39,313			115,175	116,070
Interest expense, net	(129,577)			(121,910)			(362,490)	(351,131)
Income before income taxes	406,520			416,899			1,232,560	1,128,429
Income taxes	(97,365)			(102,983)			(274,234)	(266,285)
Net income	309,155	$ 311,963	$ 337,208	313,916	$ 282,179	$ 266,049	958,326	862,144
Less: Net income attributable to noncontrolling interests	0			657			0	3,329
Net income attributable to ONEOK	309,155			313,259			958,326	858,815
Less: Preferred stock dividends	275			275			825	825
Net income available to common shareholders	308,880			312,984			957,501	857,990
Other comprehensive income (loss), net of tax	(84,708)	$ (66,872)	$ (81,285)	20,451	$ (3,897)	$ 51,939	(232,865)	68,493
Comprehensive income	224,447			334,367			725,461	930,637
Less: Comprehensive income attributable to noncontrolling interest	0			657			0	3,329
Comprehensive income attributable to ONEOK	$ 224,447			333,710			$ 725,461	927,308
Northern Border Pipeline
Condensed Financial Statements, Captions [Line Items]
Equity Method Investment, Ownership Percentage	50.00%						50.00%
Equity in net earnings from investments	$ 16,102			16,486			$ 50,593	48,863
Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	1,947,834			3,083,625			6,567,634	8,578,891
Services
Condensed Financial Statements, Captions [Line Items]
Revenues	315,394			310,265			933,127	877,605
Reportable Legal Entities | Parent Issuer & Guarantor
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Cost of sales and fuel (exclusive of items shown separately below)	0			0			0	0
Operating expenses	(700)			2,000			(700)	3,300
(Gain) loss on sale of assets	0			0			0	0
Operating income	700			(2,000)			700	(3,300)
Equity in net earnings from investments	470,200			457,300			1,392,900	1,226,600
Other income (expense), net	11,100			9,300			26,300	23,100
Interest expense, net	(78,400)			(49,100)			(198,100)	(129,200)
Income before income taxes	403,600			415,500			1,221,800	1,117,200
Income taxes	(94,400)			(102,300)			(263,500)	(258,400)
Net income	309,200			313,200			958,300	858,800
Less: Net income attributable to noncontrolling interests				0				0
Net income attributable to ONEOK				313,200				858,800
Less: Preferred stock dividends	300			200			800	800
Net income available to common shareholders	308,900			313,000			957,500	858,000
Other comprehensive income (loss), net of tax	(94,400)			23,400			(226,000)	65,600
Comprehensive income	214,800			336,600			732,300	924,400
Less: Comprehensive income attributable to noncontrolling interest				0				0
Comprehensive income attributable to ONEOK				336,600				924,400
Reportable Legal Entities | Parent Issuer & Guarantor | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Parent Issuer & Guarantor | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Subsidiary Issuer & Guarantor
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Cost of sales and fuel (exclusive of items shown separately below)	0			0			0	0
Operating expenses	0			0			0	0
(Gain) loss on sale of assets	0			0			0	0
Operating income	0			0			0	0
Equity in net earnings from investments	476,100			457,100			1,405,600	1,231,200
Other income (expense), net	75,400			80,300			232,800	234,900
Interest expense, net	(78,100)			(80,300)			(235,500)	(234,900)
Income before income taxes	473,400			457,100			1,402,900	1,231,200
Income taxes	0			0			0	0
Net income	473,400			457,100			1,402,900	1,231,200
Less: Net income attributable to noncontrolling interests				0				0
Net income attributable to ONEOK				457,100				1,231,200
Less: Preferred stock dividends	0			0			0	0
Net income available to common shareholders	473,400			457,100			1,402,900	1,231,200
Other comprehensive income (loss), net of tax	12,400			(3,700)			(9,000)	4,000
Comprehensive income	485,800			453,400			1,393,900	1,235,200
Less: Comprehensive income attributable to noncontrolling interest				0				0
Comprehensive income attributable to ONEOK				453,400				1,235,200
Reportable Legal Entities | Subsidiary Issuer & Guarantor | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Subsidiary Issuer & Guarantor | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Guarantor Subsidiary
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Cost of sales and fuel (exclusive of items shown separately below)	0			0			0	0
Operating expenses	0			0			0	0
(Gain) loss on sale of assets	100			0			2,700	0
Operating income	(100)			0			(2,700)	0
Equity in net earnings from investments	476,200			457,100			1,408,300	1,231,200
Other income (expense), net	78,100			80,300			235,500	234,900
Interest expense, net	(78,100)			(80,300)			(235,500)	(234,900)
Income before income taxes	476,100			457,100			1,405,600	1,231,200
Income taxes	0			0			0	0
Net income	476,100			457,100			1,405,600	1,231,200
Less: Net income attributable to noncontrolling interests				0				0
Net income attributable to ONEOK				457,100				1,231,200
Less: Preferred stock dividends	0			0			0	0
Net income available to common shareholders	476,100			457,100			1,405,600	1,231,200
Other comprehensive income (loss), net of tax	7,900			(8,100)			(22,500)	(6,900)
Comprehensive income	484,000			449,000			1,383,100	1,224,300
Less: Comprehensive income attributable to noncontrolling interest				0				0
Comprehensive income attributable to ONEOK				449,000				1,224,300
Reportable Legal Entities | Guarantor Subsidiary | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Guarantor Subsidiary | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	2,263,800			3,394,400			7,502,400	9,458,000
Cost of sales and fuel (exclusive of items shown separately below)	1,414,500			2,560,800			4,996,700	7,104,600
Operating expenses	367,800			336,300			1,076,500	986,800
(Gain) loss on sale of assets	(100)			(200)			200	(300)
Operating income	481,600			497,500			1,429,000	1,366,900
Equity in net earnings from investments	29,100			30,100			87,100	86,200
Other income (expense), net	8,000			(5,300)			29,300	(23,300)
Interest expense, net	(51,200)			(72,800)			(164,400)	(221,900)
Income before income taxes	467,500			449,500			1,381,000	1,207,900
Income taxes	(3,000)			(700)			(10,800)	(7,900)
Net income	464,500			448,800			1,370,200	1,200,000
Less: Net income attributable to noncontrolling interests				700				3,300
Net income attributable to ONEOK				448,100				1,196,700
Less: Preferred stock dividends	0			0			0	0
Net income available to common shareholders	464,500			448,100			1,370,200	1,196,700
Other comprehensive income (loss), net of tax	5,000			(7,300)			(20,600)	(8,000)
Comprehensive income	469,500			441,500			1,349,600	1,192,000
Less: Comprehensive income attributable to noncontrolling interest				700				3,300
Comprehensive income attributable to ONEOK				440,800				1,188,700
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	1,947,800			3,083,600			6,567,600	8,578,900
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	316,000			310,800			934,800	879,100
Reportable Legal Entities | Total
Condensed Financial Statements, Captions [Line Items]
Revenues	2,263,200			3,393,900			7,500,800	9,456,500
Cost of sales and fuel (exclusive of items shown separately below)	1,414,500			2,560,800			4,996,700	7,104,600
Operating expenses	366,500			337,800			1,074,200	988,600
(Gain) loss on sale of assets	0			(200)			2,900	(300)
Operating income	482,200			495,500			1,427,000	1,363,600
Equity in net earnings from investments	37,600			39,300			115,200	116,100
Other income (expense), net	16,400			4,000			52,900	(200)
Interest expense, net	(129,600)			(121,900)			(362,500)	(351,100)
Income before income taxes	406,600			416,900			1,232,600	1,128,400
Income taxes	(97,400)			(103,000)			(274,300)	(266,300)
Net income	309,200			313,900			958,300	862,100
Less: Net income attributable to noncontrolling interests				700				3,300
Net income attributable to ONEOK				313,200				858,800
Less: Preferred stock dividends	300			200			800	800
Net income available to common shareholders	308,900			313,000			957,500	858,000
Other comprehensive income (loss), net of tax	(84,700)			20,500			(232,800)	68,500
Comprehensive income	224,500			334,400			725,500	930,600
Less: Comprehensive income attributable to noncontrolling interest				700				3,300
Comprehensive income attributable to ONEOK				333,700				927,300
Reportable Legal Entities | Total | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	1,947,800			3,083,600			6,567,600	8,578,900
Reportable Legal Entities | Total | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	315,400			310,300			933,200	877,600
Consolidating Entries
Condensed Financial Statements, Captions [Line Items]
Revenues	(600)			(500)			(1,600)	(1,500)
Cost of sales and fuel (exclusive of items shown separately below)	0			0			0	0
Operating expenses	(600)			(500)			(1,600)	(1,500)
(Gain) loss on sale of assets	0			0			0	0
Operating income	0			0			0	0
Equity in net earnings from investments	(1,414,000)			(1,362,300)			(4,178,700)	(3,659,100)
Other income (expense), net	(156,200)			(160,600)			(471,000)	(469,800)
Interest expense, net	156,200			160,600			471,000	469,800
Income before income taxes	(1,414,000)			(1,362,300)			(4,178,700)	(3,659,100)
Income taxes	0			0			0	0
Net income	(1,414,000)			(1,362,300)			(4,178,700)	(3,659,100)
Less: Net income attributable to noncontrolling interests				0				0
Net income attributable to ONEOK				(1,362,300)				(3,659,100)
Less: Preferred stock dividends	0			0			0	0
Net income available to common shareholders	(1,414,000)			(1,362,300)			(4,178,700)	(3,659,100)
Other comprehensive income (loss), net of tax	(15,600)			16,200			45,300	13,800
Comprehensive income	(1,429,600)			(1,346,100)			(4,133,400)	(3,645,300)
Less: Comprehensive income attributable to noncontrolling interest				0				0
Comprehensive income attributable to ONEOK				(1,346,100)				(3,645,300)
Consolidating Entries | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	0			0			0	0
Consolidating Entries | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	$ (600)			$ (500)			$ (1,600)	$ (1,500)

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