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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)

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