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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Income Statement and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,457,575		$ 2,960,529		$ 5,237,533	$ 6,062,606
Cost of sales and fuel (exclusive of items shown separately below)	1,625,794		2,175,818		3,582,171	4,543,844
(Gain) loss on sale of assets	2,958		(96)		2,898	(185)
Operating income	476,146		448,366		944,888	868,065
Equity in net earnings from investments	34,118		36,570		77,599	76,757
Interest expense, net	(117,493)		(113,496)		(232,913)	(229,221)
Income before income taxes	410,898		369,710		826,040	711,530
Income taxes	(98,935)		(87,531)		(176,869)	(163,302)
Net income	311,963	$ 337,208	282,179	$ 266,049	649,171	548,228
Less: Net income attributable to noncontrolling interests	0		1,131		0	2,672
Net income attributable to ONEOK	311,963		281,048		649,171	545,556
Less: Preferred stock dividends	275		275		550	550
Net income available to common shareholders	311,688		280,773		648,621	545,006
Other comprehensive income (loss), net of tax	(66,872)	$ (81,285)	(3,897)	$ 51,939	(148,157)	48,042
Comprehensive income	245,091		278,282		501,014	596,270
Less: Comprehensive income attributable to noncontrolling interest	0		1,131		0	2,672
Comprehensive income attributable to ONEOK	$ 245,091		277,151		$ 501,014	593,598
Northern Border Pipeline
Condensed Financial Statements, Captions [Line Items]
Equity Method Investment, Ownership Percentage	50.00%				50.00%
Equity in net earnings from investments	$ 13,689		15,240		$ 34,491	32,377
Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	2,146,841		2,675,262		4,619,800	5,495,266
Services
Condensed Financial Statements, Captions [Line Items]
Revenues	310,734		285,267		617,733	567,340
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	0		2,000		0	1,300
(Gain) loss on sale of assets	0		0		0	0
Operating income	0		(2,000)		0	(1,300)
Equity in net earnings from investments	466,000		400,800		922,700	769,300
Other income (expense), net	8,500		6,600		15,300	13,800
Interest expense, net	(66,900)		(40,300)		(119,700)	(80,100)
Income before income taxes	407,600		365,100		818,300	701,700
Income taxes	(95,600)		(84,000)		(169,100)	(156,100)
Net income	312,000		281,100		649,200	545,600
Less: Net income attributable to noncontrolling interests			0			0
Net income attributable to ONEOK			281,100			545,600
Less: Preferred stock dividends	300		300		600	600
Net income available to common shareholders	311,700		280,800		648,600	545,000
Other comprehensive income (loss), net of tax	(80,600)		19,700		(131,600)	42,200
Comprehensive income	231,400		300,800		517,600	587,800
Less: Comprehensive income attributable to noncontrolling interest			0			0
Comprehensive income attributable to ONEOK			300,800			587,800
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	468,900		403,200		929,500	774,100
Other income (expense), net	76,400		77,500		157,400	154,600
Interest expense, net	(76,400)		(77,500)		(157,400)	(154,600)
Income before income taxes	468,900		403,200		929,500	774,100
Income taxes	0		0		0	0
Net income	468,900		403,200		929,500	774,100
Less: Net income attributable to noncontrolling interests			0			0
Net income attributable to ONEOK			403,200			774,100
Less: Preferred stock dividends	0		0		0	0
Net income available to common shareholders	468,900		403,200		929,500	774,100
Other comprehensive income (loss), net of tax	18,000		(30,600)		(21,400)	7,700
Comprehensive income	486,900		372,600		908,100	781,800
Less: Comprehensive income attributable to noncontrolling interest			0			0
Comprehensive income attributable to ONEOK			372,600			781,800
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	2,600		0		2,600	0
Operating income	(2,600)		0		(2,600)	0
Equity in net earnings from investments	471,500		403,200		932,100	774,100
Other income (expense), net	76,400		77,500		157,400	154,600
Interest expense, net	(76,400)		(77,500)		(157,400)	(154,600)
Income before income taxes	468,900		403,200		929,500	774,100
Income taxes	0		0		0	0
Net income	468,900		403,200		929,500	774,100
Less: Net income attributable to noncontrolling interests			0			0
Net income attributable to ONEOK			403,200			774,100
Less: Preferred stock dividends	0		0		0	0
Net income available to common shareholders	468,900		403,200		929,500	774,100
Other comprehensive income (loss), net of tax	13,400		(35,000)		(30,400)	1,200
Comprehensive income	482,300		368,200		899,100	775,300
Less: Comprehensive income attributable to noncontrolling interest			0			0
Comprehensive income attributable to ONEOK			368,200			775,300
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	2,458,100		2,961,100		5,238,500	6,063,600
Cost of sales and fuel (exclusive of items shown separately below)	1,625,800		2,175,800		3,582,200	4,543,800
Operating expenses	353,200		335,000		708,500	650,600
(Gain) loss on sale of assets	400		(100)		300	(200)
Operating income	478,700		450,400		947,500	869,400
Equity in net earnings from investments	27,900		27,500		58,000	56,100
Other income (expense), net	9,700		(8,400)		21,200	(18,000)
Interest expense, net	(50,600)		(73,200)		(113,200)	(149,100)
Income before income taxes	465,700		396,300		913,500	758,400
Income taxes	(3,300)		(3,500)		(7,800)	(7,200)
Net income	462,400		392,800		905,700	751,200
Less: Net income attributable to noncontrolling interests			1,100			2,600
Net income attributable to ONEOK			391,700			748,600
Less: Preferred stock dividends	0		0		0	0
Net income available to common shareholders	462,400		391,700		905,700	748,600
Other comprehensive income (loss), net of tax	9,100		(27,900)		(25,600)	(700)
Comprehensive income	471,500		364,900		880,100	750,500
Less: Comprehensive income attributable to noncontrolling interest			1,100			2,600
Comprehensive income attributable to ONEOK			363,800			747,900
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	2,146,800		2,675,300		4,619,800	5,495,300
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	311,300		285,800		618,700	568,300
Reportable Legal Entities | Total
Condensed Financial Statements, Captions [Line Items]
Revenues	2,457,600		2,960,600		5,237,500	6,062,600
Cost of sales and fuel (exclusive of items shown separately below)	1,625,800		2,175,800		3,582,200	4,543,800
Operating expenses	352,700		336,500		707,500	650,900
(Gain) loss on sale of assets	3,000		(100)		2,900	(200)
Operating income	476,100		448,400		944,900	868,100
Equity in net earnings from investments	34,100		36,600		77,600	76,800
Other income (expense), net	18,200		(1,800)		36,500	(4,200)
Interest expense, net	(117,500)		(113,500)		(232,900)	(229,200)
Income before income taxes	410,900		369,700		826,100	711,500
Income taxes	(98,900)		(87,500)		(176,900)	(163,300)
Net income	312,000		282,200		649,200	548,200
Less: Net income attributable to noncontrolling interests			1,100			2,600
Net income attributable to ONEOK			281,100			545,600
Less: Preferred stock dividends	300		300		600	600
Net income available to common shareholders	311,700		280,800		648,600	545,000
Other comprehensive income (loss), net of tax	(66,900)		(3,900)		(148,200)	48,000
Comprehensive income	245,100		278,300		501,000	596,200
Less: Comprehensive income attributable to noncontrolling interest			1,100			2,600
Comprehensive income attributable to ONEOK			277,200			593,600
Reportable Legal Entities | Total | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues	2,146,800		2,675,300		4,619,800	5,495,300
Reportable Legal Entities | Total | Services
Condensed Financial Statements, Captions [Line Items]
Revenues	310,800		285,300		617,700	567,300
Consolidating Entries
Condensed Financial Statements, Captions [Line Items]
Revenues	(500)		(500)		(1,000)	(1,000)
Cost of sales and fuel (exclusive of items shown separately below)	0		0		0	0
Operating expenses	(500)		(500)		(1,000)	(1,000)
(Gain) loss on sale of assets	0		0		0	0
Operating income	0		0		0	0
Equity in net earnings from investments	(1,400,200)		(1,198,100)		(2,764,700)	(2,296,800)
Other income (expense), net	(152,800)		(155,000)		(314,800)	(309,200)
Interest expense, net	152,800		155,000		314,800	309,200
Income before income taxes	(1,400,200)		(1,198,100)		(2,764,700)	(2,296,800)
Income taxes	0		0		0	0
Net income	(1,400,200)		(1,198,100)		(2,764,700)	(2,296,800)
Less: Net income attributable to noncontrolling interests			0			0
Net income attributable to ONEOK			(1,198,100)			(2,296,800)
Less: Preferred stock dividends	0		0		0	0
Net income available to common shareholders	(1,400,200)		(1,198,100)		(2,764,700)	(2,296,800)
Other comprehensive income (loss), net of tax	(26,800)		69,900		60,800	(2,400)
Comprehensive income	(1,427,000)		(1,128,200)		(2,703,900)	(2,299,200)
Less: Comprehensive income attributable to noncontrolling interest			0			0
Comprehensive income attributable to ONEOK			(1,128,200)			(2,299,200)
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	$ (500)		$ (500)		$ (1,000)	$ (1,000)

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