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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]        
Commodity sales $ 2,675,262 $ 2,161,009 $ 5,495,266 $ 4,377,726
Services 285,267 564,763 567,340 1,097,657
Total revenues 2,960,529 2,725,772 6,062,606 5,475,383
Cost of sales and fuel (exclusive of items shown separately below) 2,175,818 2,091,022 4,543,844 4,234,865
Gain on sale of assets (96) (637) (185) (630)
Operating income 448,366 319,450 868,065 636,587
Equity in net earnings (loss) from investments 36,570 39,363 76,757 78,927
Interest expense, net (113,496) (118,473) (229,221) (234,935)
Income before income taxes 369,710 219,835 711,530 460,961
Income taxes (87,531) (43,844) (163,302) (98,785)
Net income 282,179 175,991 548,228 362,176
Less: Net income attributable to noncontrolling interests 1,131 104,298 2,672 203,122
Net income attributable to ONEOK 281,048 71,693 545,556 159,054
Less: Preferred stock dividends 275 217 550 217
Net income available to common shareholders $ 280,773 71,476 $ 545,006 158,837
Northern Border Pipeline        
Condensed Financial Statements, Captions [Line Items]        
Equity Method Investment, Ownership Percentage 50.00%   50.00%  
Equity in net earnings (loss) from investments $ 15,240 15,622 $ 32,377 34,439
Reportable Legal Entities | Parent Issuer & Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 0 0 0 0
Services 0 0 0 0
Total revenues 0 0 0 0
Cost of sales and fuel (exclusive of items shown separately below) 0 0 0 0
Operating expenses 2,000 17,700 1,300 24,700
Gain on sale of assets 0 0 0 0
Operating income (2,000) (17,700) (1,300) (24,700)
Equity in net earnings (loss) from investments 400,800 275,200 769,300 544,000
Other income (expense), net 6,600 (20,200) 13,800 (19,600)
Interest expense, net (40,300) (24,500) (80,100) (50,300)
Income before income taxes 365,100 212,800 701,700 449,400
Income taxes (84,000) (37,700) (156,100) (89,000)
Net income 281,100 175,100 545,600 360,400
Less: Net income attributable to noncontrolling interests 0 103,400 0 201,300
Net income attributable to ONEOK 281,100 71,700 545,600 159,100
Less: Preferred stock dividends 300 200 600 200
Net income available to common shareholders 280,800 71,500 545,000 158,900
Reportable Legal Entities | Subsidiary Issuer & Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 0 0 0 0
Services 0 0 0 0
Total 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 on sale of assets 0 0 0 0
Operating income 0 0 0 0
Equity in net earnings (loss) from investments 403,200 278,500 774,100 547,600
Other income (expense), net 77,500 94,900 154,600 186,100
Interest expense, net (77,500) (94,900) (154,600) (186,100)
Income before income taxes 403,200 278,500 774,100 547,600
Income taxes 0 0 0 0
Net income 403,200 278,500 774,100 547,600
Less: Net income attributable to noncontrolling interests 0 0 0 0
Net income attributable to ONEOK 403,200 278,500 774,100 547,600
Less: Preferred stock dividends 0 0 0 0
Net income available to common shareholders 403,200 278,500 774,100 547,600
Reportable Legal Entities | Guarantor Subsidiary        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 0 0 0 0
Services 0 0 0 0
Total revenues 0 0 0 0
Cost of sales and fuel (exclusive of items shown separately below) 0 0 0 0
Operating expenses 0 6,200 0 6,200
Gain on sale of assets 0 0 0 0
Operating income 0 (6,200) 0 (6,200)
Equity in net earnings (loss) from investments 403,200 284,700 774,100 553,800
Other income (expense), net 77,500 94,900 154,600 186,100
Interest expense, net (77,500) (94,900) (154,600) (186,100)
Income before income taxes 403,200 278,500 774,100 547,600
Income taxes 0 0 0 0
Net income 403,200 278,500 774,100 547,600
Less: Net income attributable to noncontrolling interests 0 0 0 0
Net income attributable to ONEOK 403,200 278,500 774,100 547,600
Less: Preferred stock dividends 0 0 0 0
Net income available to common shareholders 403,200 278,500 774,100 547,600
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 2,675,300 2,161,000 5,495,300 4,377,700
Services 285,800 565,800 568,300 1,098,700
Total revenues 2,961,100 2,726,800 6,063,600 5,476,400
Cost of sales and fuel (exclusive of items shown separately below) 2,175,800 2,091,000 4,543,800 4,234,900
Operating expenses 335,000 293,000 650,600 574,600
Gain on sale of assets (100) (600) (200) (600)
Operating income 450,400 343,400 869,400 667,500
Equity in net earnings (loss) from investments 27,500 23,800 56,100 44,500
Other income (expense), net (8,400) (400) (18,000) 0
Interest expense, net (73,200) (94,000) (149,100) (184,600)
Income before income taxes 396,300 272,800 758,400 527,400
Income taxes (3,500) (6,100) (7,200) (9,800)
Net income 392,800 266,700 751,200 517,600
Less: Net income attributable to noncontrolling interests 1,100 900 2,600 1,800
Net income attributable to ONEOK 391,700 265,800 748,600 515,800
Less: Preferred stock dividends 0 0 0 0
Net income available to common shareholders 391,700 265,800 748,600 515,800
Reportable Legal Entities | Total        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 2,675,300 2,161,000 5,495,300 4,377,700
Services 285,300 564,800 567,300 1,097,700
Total revenues 2,960,600 2,725,800 6,062,600 5,475,400
Cost of sales and fuel (exclusive of items shown separately below) 2,175,800 2,091,000 4,543,800 4,234,900
Operating expenses 336,500 315,900 650,900 604,500
Gain on sale of assets (100) (600) (200) (600)
Operating income 448,400 319,500 868,100 636,600
Equity in net earnings (loss) from investments 36,600 39,400 76,800 78,900
Other income (expense), net (1,800) (20,600) (4,200) (19,600)
Interest expense, net (113,500) (118,500) (229,200) (234,900)
Income before income taxes 369,700 219,800 711,500 461,000
Income taxes (87,500) (43,800) (163,300) (98,800)
Net income 282,200 176,000 548,200 362,200
Less: Net income attributable to noncontrolling interests 1,100 104,300 2,600 203,100
Net income attributable to ONEOK 281,100 71,700 545,600 159,100
Less: Preferred stock dividends 300 200 600 200
Net income available to common shareholders 280,800 71,500 545,000 158,900
Consolidating Entries        
Condensed Financial Statements, Captions [Line Items]        
Commodity sales 0 0 0 0
Services (500) (1,000) (1,000) (1,000)
Total revenues (500) (1,000) (1,000) (1,000)
Cost of sales and fuel (exclusive of items shown separately below) 0 0 0 0
Operating expenses (500) (1,000) (1,000) (1,000)
Gain on sale of assets 0 0 0 0
Operating income 0 0 0 0
Equity in net earnings (loss) from investments (1,198,100) (822,800) (2,296,800) (1,611,000)
Other income (expense), net (155,000) (189,800) (309,200) (372,200)
Interest expense, net 155,000 189,800 309,200 372,200
Income before income taxes (1,198,100) (822,800) (2,296,800) (1,611,000)
Income taxes 0 0 0 0
Net income (1,198,100) (822,800) (2,296,800) (1,611,000)
Less: Net income attributable to noncontrolling interests 0 0 0 0
Net income attributable to ONEOK (1,198,100) (822,800) (2,296,800) (1,611,000)
Less: Preferred stock dividends 0 0 0 0
Net income available to common shareholders $ (1,198,100) $ (822,800) $ (2,296,800) $ (1,611,000)