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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CONDENSED CONSOLIDATING FINANCIAL STATEMENTS, Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Equity Method Investment, Ownership Percentage	50.00%								50.00%
Revenues	$ 2,663,606	$ 2,263,228	$ 2,457,575	$ 2,779,958	$ 3,136,700	$ 3,393,890	$ 2,960,529	$ 3,102,077	$ 10,164,367	$ 12,593,196	$ 12,173,907
Cost of sales and fuel (exclusive of items shown separately below)									6,788,040	9,422,708	9,538,045
Impairment of long-lived assets									0	0	15,970
(Gain) loss on sale of assets									2,575	(601)	(924)
Operating income	487,314	482,151	476,146	468,742	471,865	495,534	448,366	419,699	1,914,353	1,835,464	1,391,771
Equity in net earnings from investments									154,541	158,383	159,278
Impairment of equity investments									0	0	(4,270)
Interest expense, net									(491,773)	(469,620)	(485,658)
Income before income taxes									1,650,991	1,517,935	1,040,801
Income taxes									(372,414)	(362,903)	(447,282)
Net income	320,251	309,155	311,963	337,208	292,888	313,916	282,179	266,049	1,278,577	1,155,032	593,519
Less: Net income attributable to noncontrolling interests									0	3,329	205,678
Net income attributable to ONEOK									1,278,577	1,151,703	387,841
Less: Preferred stock dividends									1,100	1,100	767
Net income available to common shareholders	$ 319,976	$ 308,880	$ 311,688	$ 336,933	$ 292,613	$ 312,984	$ 280,773	$ 264,233	1,277,477	1,150,603	387,074
Other Comprehensive Income (Loss), Net of Tax									(185,761)	38,392	37,134
Comprehensive income									1,092,816	1,193,424	630,653
Less: Comprehensive income attributable to noncontrolling interests									0	3,329	236,704
Comprehensive income attributable to ONEOK									$ 1,092,816	$ 1,190,095	393,949
Northern Border Pipeline [Member]
Condensed Financial Statements, Captions [Line Items]
Equity Method Investment, Ownership Percentage	50.00%				50.00%				50.00%	50.00%
Equity in net earnings from investments									$ 68,871	$ 67,854	68,153
Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									8,916,047	11,395,642	9,862,652
Services
Condensed Financial Statements, Captions [Line Items]
Revenues									1,248,320	1,197,554	2,311,255
Reportable Legal Entities | Parent Issuer & Guarantor
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Cost of sales and fuel (exclusive of items shown separately below)									0	0	0
Operating expenses									0	(600)	17,800
Impairment of long-lived assets											0
(Gain) loss on sale of assets									0	0	0
Operating income									0	600	(17,800)
Equity in net earnings from investments									1,898,700	1,655,600	1,236,600
Impairment of equity investments											0
Other income (expense), net									34,400	29,600	(12,300)
Interest expense, net									(287,400)	(179,400)	(137,100)
Income before income taxes									1,645,700	1,506,400	1,069,400
Income taxes									(367,100)	(354,700)	(480,200)
Net income									1,278,600	1,151,700	589,200
Less: Net income attributable to noncontrolling interests										0	201,400
Net income attributable to ONEOK									1,278,600	1,151,700	387,800
Less: Preferred stock dividends									1,100	1,100	800
Net income available to common shareholders									1,277,500	1,150,600	387,000
Other Comprehensive Income (Loss), Net of Tax									(183,800)	(39,500)	17,400
Comprehensive income									1,094,800	1,112,200	606,600
Less: Comprehensive income attributable to noncontrolling interests										0	232,400
Comprehensive income attributable to ONEOK										1,112,200	374,200
Reportable Legal Entities | Parent Issuer & Guarantor | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Parent Issuer & Guarantor | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Subsidiary Issuer & Guarantor
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Cost of sales and fuel (exclusive of items shown separately below)									0	0	0
Operating expenses									0	0	0
Impairment of long-lived assets											0
(Gain) loss on sale of assets									0	0	0
Operating income									0	0	0
Equity in net earnings from investments									1,906,200	1,660,500	1,215,700
Impairment of equity investments											0
Other income (expense), net									305,700	315,100	353,100
Interest expense, net									(308,300)	(315,100)	(353,100)
Income before income taxes									1,903,600	1,660,500	1,215,700
Income taxes									0	0	0
Net income									1,903,600	1,660,500	1,215,700
Less: Net income attributable to noncontrolling interests										0	0
Net income attributable to ONEOK									1,903,600	1,660,500	1,215,700
Less: Preferred stock dividends									0	0	0
Net income available to common shareholders									1,903,600	1,660,500	1,215,700
Other Comprehensive Income (Loss), Net of Tax									(2,600)	101,100	13,200
Comprehensive income									1,901,000	1,761,600	1,228,900
Less: Comprehensive income attributable to noncontrolling interests										0	0
Comprehensive income attributable to ONEOK										1,761,600	1,228,900
Reportable Legal Entities | Subsidiary Issuer & Guarantor | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Subsidiary Issuer & Guarantor | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Guarantor Subsidiary
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Cost of sales and fuel (exclusive of items shown separately below)									0	0	0
Operating expenses									0	0	9,200
Impairment of long-lived assets											0
(Gain) loss on sale of assets									2,700	0	0
Operating income									(2,700)	0	(9,200)
Equity in net earnings from investments									1,908,900	1,660,500	1,224,900
Impairment of equity investments											0
Other income (expense), net									308,300	315,100	353,100
Interest expense, net									(308,300)	(315,100)	(353,100)
Income before income taxes									1,906,200	1,660,500	1,215,700
Income taxes									0	0	0
Net income									1,906,200	1,660,500	1,215,700
Less: Net income attributable to noncontrolling interests										0	0
Net income attributable to ONEOK									1,906,200	1,660,500	1,215,700
Less: Preferred stock dividends									0	0	0
Net income available to common shareholders									1,906,200	1,660,500	1,215,700
Other Comprehensive Income (Loss), Net of Tax									(20,900)	85,900	27,900
Comprehensive income									1,885,300	1,746,400	1,243,600
Less: Comprehensive income attributable to noncontrolling interests										0	0
Comprehensive income attributable to ONEOK										1,746,400	1,243,600
Reportable Legal Entities | Guarantor Subsidiary | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Guarantor Subsidiary | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues									10,166,500	12,595,300	12,175,900
Cost of sales and fuel (exclusive of items shown separately below)									6,788,000	9,422,700	9,538,000
Operating expenses									1,461,500	1,338,300	1,204,000
Impairment of long-lived assets											16,000
(Gain) loss on sale of assets									(100)	(600)	(900)
Operating income									1,917,100	1,834,900	1,418,800
Equity in net earnings from investments									116,300	116,300	100,700
Impairment of equity investments											(4,300)
Other income (expense), net									42,100	(36,000)	(8,000)
Interest expense, net									(204,400)	(290,200)	(348,600)
Income before income taxes									1,871,100	1,625,000	1,158,600
Income taxes									(5,300)	(8,200)	32,900
Net income									1,865,800	1,616,800	1,191,500
Less: Net income attributable to noncontrolling interests										3,300	4,300
Net income attributable to ONEOK									1,865,800	1,613,500	1,187,200
Less: Preferred stock dividends									0	0	0
Net income available to common shareholders									1,865,800	1,613,500	1,187,200
Other Comprehensive Income (Loss), Net of Tax									(20,500)	62,600	34,500
Comprehensive income									1,845,300	1,679,400	1,226,000
Less: Comprehensive income attributable to noncontrolling interests										3,300	4,300
Comprehensive income attributable to ONEOK										1,676,100	1,221,700
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									8,916,100	11,395,600	9,862,700
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									1,250,400	1,199,700	2,313,200
Reportable Legal Entities | Total
Condensed Financial Statements, Captions [Line Items]
Revenues									10,164,400	12,593,200	12,173,900
Cost of sales and fuel (exclusive of items shown separately below)									6,788,000	9,422,700	9,538,000
Operating expenses									1,459,400	1,335,600	1,229,000
Impairment of long-lived assets											16,000
(Gain) loss on sale of assets									2,600	(600)	(900)
Operating income									1,914,400	1,835,500	1,391,800
Equity in net earnings from investments									154,500	158,400	159,300
Impairment of equity investments											(4,300)
Other income (expense), net									73,900	(6,400)	(20,300)
Interest expense, net									(491,800)	(469,600)	(485,700)
Income before income taxes									1,651,000	1,517,900	1,040,800
Income taxes									(372,400)	(362,900)	(447,300)
Net income									1,278,600	1,155,000	593,500
Less: Net income attributable to noncontrolling interests										3,300	205,700
Net income attributable to ONEOK									1,278,600	1,151,700	387,800
Less: Preferred stock dividends									1,100	1,100	800
Net income available to common shareholders									1,277,500	1,150,600	387,000
Other Comprehensive Income (Loss), Net of Tax									(185,800)	38,400	37,100
Comprehensive income									1,092,800	1,193,400	630,600
Less: Comprehensive income attributable to noncontrolling interests										3,300	236,700
Comprehensive income attributable to ONEOK										1,190,100	393,900
Reportable Legal Entities | Total | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									8,916,100	11,395,600	9,862,700
Reportable Legal Entities | Total | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									1,248,300	1,197,600	2,311,200
Consolidating Entries and Other
Condensed Financial Statements, Captions [Line Items]
Revenues									(2,100)	(2,100)	(2,000)
Cost of sales and fuel (exclusive of items shown separately below)									0	0	0
Operating expenses									(2,100)	(2,100)	(2,000)
Impairment of long-lived assets											0
(Gain) loss on sale of assets									0	0	0
Operating income									0	0	0
Equity in net earnings from investments									(5,675,600)	(4,934,500)	(3,618,600)
Impairment of equity investments											0
Other income (expense), net									(616,600)	(630,200)	(706,200)
Interest expense, net									616,600	630,200	706,200
Income before income taxes									(5,675,600)	(4,934,500)	(3,618,600)
Income taxes									0	0	0
Net income									(5,675,600)	(4,934,500)	(3,618,600)
Less: Net income attributable to noncontrolling interests										0	0
Net income attributable to ONEOK									(5,675,600)	(4,934,500)	(3,618,600)
Less: Preferred stock dividends									0	0	0
Net income available to common shareholders									(5,675,600)	(4,934,500)	(3,618,600)
Other Comprehensive Income (Loss), Net of Tax									42,000	(171,700)	(55,900)
Comprehensive income									(5,633,600)	(5,106,200)	(3,674,500)
Less: Comprehensive income attributable to noncontrolling interests										0	0
Comprehensive income attributable to ONEOK										(5,106,200)	(3,674,500)
Consolidating Entries and Other | Commodity Sales
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Consolidating Entries and Other | Services
Condensed Financial Statements, Captions [Line Items]
Revenues									$ (2,100)	$ (2,100)	$ (2,000)

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