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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Commodity sales | $ 3,083,625 | $ 2,322,534 | $ 8,578,891 | $ 6,700,260
Services | 310,265 | 583,832 | 877,605 | 1,681,489
Total revenues | 3,393,890 | 2,906,366 | 9,456,496 | 8,381,749
Cost of sales and fuel (exclusive of items shown separately below) | 2,560,765 | 2,229,416 | 7,104,609 | 6,464,281
Impairment of long-lived assets | 0 | 15,970 | 0 | 15,970
Gain on sale of assets | (163) | (274) | (348) | (904)
Operating income | 495,534 | 354,622 | 1,363,599 | 991,209
Equity in net earnings (loss) from investments | 39,313 | 40,058 | 116,070 | 118,985
Impairment of equity investments | 0 | (4,270) | 0 | (4,270)
Interest expense, net | (121,910) | (126,533) | (351,131) | (361,468)
Income before income taxes | 416,899 | 263,659 | 1,128,429 | 724,620
Income taxes | (102,983) | (97,128) | (266,285) | (195,913)
Net income | 313,916 | 166,531 | 862,144 | 528,707
Less: Net income attributable to noncontrolling interests | 657 | 789 | 3,329 | 203,911
Net income attributable to ONEOK | 313,259 | 165,742 | 858,815 | 324,796
Less: Preferred stock dividends | 275 | 276 | 825 | 493
Net income available to common shareholders | $ 312,984 | 165,466 | $ 857,990 | 324,303
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 | $ 16,486 | 16,440 | $ 48,863 | 50,879
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 | 1,200 | 3,300 | 25,900
Impairment of long-lived assets |  | 0 |  | 0
Gain on sale of assets | 0 | 0 | 0 | 0
Operating income | (2,000) | (1,200) | (3,300) | (25,900)
Equity in net earnings (loss) from investments | 457,300 | 298,000 | 1,226,600 | 842,000
Impairment of equity investments |  | 0 |  | 0
Other income (expense), net | 9,300 | 4,100 | 23,100 | (15,500)
Interest expense, net | (49,100) | (43,200) | (129,200) | (93,500)
Income before income taxes | 415,500 | 257,700 | 1,117,200 | 707,100
Income taxes | (102,300) | (91,900) | (258,400) | (180,900)
Net income | 313,200 | 165,800 | 858,800 | 526,200
Less: Net income attributable to noncontrolling interests | 0 | 100 | 0 | 201,400
Net income attributable to ONEOK | 313,200 | 165,700 | 858,800 | 324,800
Less: Preferred stock dividends | 200 | 200 | 800 | 500
Net income available to common shareholders | 313,000 | 165,500 | 858,000 | 324,300
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
Impairment of long-lived assets |  | 0 |  | 0
Gain on sale of assets | 0 | 0 | 0 | 0
Operating income | 0 | 0 | 0 | 0
Equity in net earnings (loss) from investments | 457,100 | 298,300 | 1,231,200 | 845,900
Impairment of equity investments |  | 0 |  | 0
Other income (expense), net | 80,300 | 86,100 | 234,900 | 272,200
Interest expense, net | (80,300) | (86,100) | (234,900) | (272,200)
Income before income taxes | 457,100 | 298,300 | 1,231,200 | 845,900
Income taxes | 0 | 0 | 0 | 0
Net income | 457,100 | 298,300 | 1,231,200 | 845,900
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to ONEOK | 457,100 | 298,300 | 1,231,200 | 845,900
Less: Preferred stock dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | 457,100 | 298,300 | 1,231,200 | 845,900
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 | 2,600 | 0 | 8,800
Impairment of long-lived assets |  | 0 |  | 0
Gain on sale of assets | 0 | 0 | 0 | 0
Operating income | 0 | (2,600) | 0 | (8,800)
Equity in net earnings (loss) from investments | 457,100 | 300,900 | 1,231,200 | 854,700
Impairment of equity investments |  | 0 |  | 0
Other income (expense), net | 80,300 | 86,100 | 234,900 | 272,200
Interest expense, net | (80,300) | (86,100) | (234,900) | (272,200)
Income before income taxes | 457,100 | 298,300 | 1,231,200 | 845,900
Income taxes | 0 | 0 | 0 | 0
Net income | 457,100 | 298,300 | 1,231,200 | 845,900
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to ONEOK | 457,100 | 298,300 | 1,231,200 | 845,900
Less: Preferred stock dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | 457,100 | 298,300 | 1,231,200 | 845,900
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Commodity sales | 3,083,600 | 2,322,500 | 8,578,900 | 6,700,300
Services | 310,800 | 584,300 | 879,100 | 1,683,000
Total revenues | 3,394,400 | 2,906,800 | 9,458,000 | 8,383,300
Cost of sales and fuel (exclusive of items shown separately below) | 2,560,800 | 2,229,400 | 7,104,600 | 6,464,300
Operating expenses | 336,300 | 303,300 | 986,800 | 878,000
Impairment of long-lived assets |  | 16,000 |  | 16,000
Gain on sale of assets | (200) | (300) | (300) | (900)
Operating income | 497,500 | 358,400 | 1,366,900 | 1,025,900
Equity in net earnings (loss) from investments | 30,100 | 27,600 | 86,200 | 72,100
Impairment of equity investments |  | (4,300) |  | (4,300)
Other income (expense), net | (5,300) | (4,300) | (23,300) | (4,300)
Interest expense, net | (72,800) | (83,300) | (221,900) | (268,000)
Income before income taxes | 449,500 | 294,100 | 1,207,900 | 821,400
Income taxes | (700) | (5,300) | (7,900) | (15,000)
Net income | 448,800 | 288,800 | 1,200,000 | 806,400
Less: Net income attributable to noncontrolling interests | 700 | 700 | 3,300 | 2,500
Net income attributable to ONEOK | 448,100 | 288,100 | 1,196,700 | 803,900
Less: Preferred stock dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | 448,100 | 288,100 | 1,196,700 | 803,900
Reportable Legal Entities | Total |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Commodity sales | 3,083,600 | 2,322,500 | 8,578,900 | 6,700,300
Services | 310,300 | 583,800 | 877,600 | 1,681,500
Total revenues | 3,393,900 | 2,906,300 | 9,456,500 | 8,381,800
Cost of sales and fuel (exclusive of items shown separately below) | 2,560,800 | 2,229,400 | 7,104,600 | 6,464,300
Operating expenses | 337,800 | 306,600 | 988,600 | 911,200
Impairment of long-lived assets |  | 16,000 |  | 16,000
Gain on sale of assets | (200) | (300) | (300) | (900)
Operating income | 495,500 | 354,600 | 1,363,600 | 991,200
Equity in net earnings (loss) from investments | 39,300 | 40,100 | 116,100 | 119,000
Impairment of equity investments |  | (4,300) |  | (4,300)
Other income (expense), net | 4,000 | (200) | (200) | (19,800)
Interest expense, net | (121,900) | (126,500) | (351,100) | (361,500)
Income before income taxes | 416,900 | 263,700 | 1,128,400 | 724,600
Income taxes | (103,000) | (97,200) | (266,300) | (195,900)
Net income | 313,900 | 166,500 | 862,100 | 528,700
Less: Net income attributable to noncontrolling interests | 700 | 800 | 3,300 | 203,900
Net income attributable to ONEOK | 313,200 | 165,700 | 858,800 | 324,800
Less: Preferred stock dividends | 200 | 200 | 800 | 500
Net income available to common shareholders | 313,000 | 165,500 | 858,000 | 324,300
Consolidating Entries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Commodity sales | 0 | 0 | 0 | 0
Services | (500) | (500) | (1,500) | (1,500)
Total revenues | (500) | (500) | (1,500) | (1,500)
Cost of sales and fuel (exclusive of items shown separately below) | 0 | 0 | 0 | 0
Operating expenses | (500) | (500) | (1,500) | (1,500)
Impairment of long-lived assets |  | 0 |  | 0
Gain on sale of assets | 0 | 0 | 0 | 0
Operating income | 0 | 0 | 0 | 0
Equity in net earnings (loss) from investments | (1,362,300) | (884,700) | (3,659,100) | (2,495,700)
Impairment of equity investments |  | 0 |  | 0
Other income (expense), net | (160,600) | (172,200) | (469,800) | (544,400)
Interest expense, net | 160,600 | 172,200 | 469,800 | 544,400
Income before income taxes | (1,362,300) | (884,700) | (3,659,100) | (2,495,700)
Income taxes | 0 | 0 | 0 | 0
Net income | (1,362,300) | (884,700) | (3,659,100) | (2,495,700)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to ONEOK | (1,362,300) | (884,700) | (3,659,100) | (2,495,700)
Less: Preferred stock dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | $ (1,362,300) | $ (884,700) | $ (3,659,100) | $ (2,495,700)

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