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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Income Statement and Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,263,228 |  |  | $ 3,393,890 |  |  | $ 7,500,761 | $ 9,456,496
Cost of sales and fuel (exclusive of items shown separately below) | 1,414,528 |  |  | 2,560,765 |  |  | 4,996,699 | 7,104,609
(Gain) loss on sale of assets | (16) |  |  | (163) |  |  | 2,882 | (348)
Operating income | 482,151 |  |  | 495,534 |  |  | 1,427,039 | 1,363,599
Equity in net earnings from investments | 37,576 |  |  | 39,313 |  |  | 115,175 | 116,070
Interest expense, net | (129,577) |  |  | (121,910) |  |  | (362,490) | (351,131)
Income before income taxes | 406,520 |  |  | 416,899 |  |  | 1,232,560 | 1,128,429
Income taxes | (97,365) |  |  | (102,983) |  |  | (274,234) | (266,285)
Net income | 309,155 | $ 311,963 | $ 337,208 | 313,916 | $ 282,179 | $ 266,049 | 958,326 | 862,144
Less: Net income attributable to noncontrolling interests | 0 |  |  | 657 |  |  | 0 | 3,329
Net income attributable to ONEOK | 309,155 |  |  | 313,259 |  |  | 958,326 | 858,815
Less: Preferred stock dividends | 275 |  |  | 275 |  |  | 825 | 825
Net income available to common shareholders | 308,880 |  |  | 312,984 |  |  | 957,501 | 857,990
Other comprehensive income (loss), net of tax | (84,708) | $ (66,872) | $ (81,285) | 20,451 | $ (3,897) | $ 51,939 | (232,865) | 68,493
Comprehensive income | 224,447 |  |  | 334,367 |  |  | 725,461 | 930,637
Less: Comprehensive income attributable to noncontrolling interest | 0 |  |  | 657 |  |  | 0 | 3,329
Comprehensive income attributable to ONEOK | $ 224,447 |  |  | 333,710 |  |  | $ 725,461 | 927,308
Northern Border Pipeline |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |  |  |  | 50.00% |
Equity in net earnings from investments | $ 16,102 |  |  | 16,486 |  |  | $ 50,593 | 48,863
Commodity Sales |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,947,834 |  |  | 3,083,625 |  |  | 6,567,634 | 8,578,891
Services |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 315,394 |  |  | 310,265 |  |  | 933,127 | 877,605
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 | (700) |  |  | 2,000 |  |  | (700) | 3,300
(Gain) loss on sale of assets | 0 |  |  | 0 |  |  | 0 | 0
Operating income | 700 |  |  | (2,000) |  |  | 700 | (3,300)
Equity in net earnings from investments | 470,200 |  |  | 457,300 |  |  | 1,392,900 | 1,226,600
Other income (expense), net | 11,100 |  |  | 9,300 |  |  | 26,300 | 23,100
Interest expense, net | (78,400) |  |  | (49,100) |  |  | (198,100) | (129,200)
Income before income taxes | 403,600 |  |  | 415,500 |  |  | 1,221,800 | 1,117,200
Income taxes | (94,400) |  |  | (102,300) |  |  | (263,500) | (258,400)
Net income | 309,200 |  |  | 313,200 |  |  | 958,300 | 858,800
Less: Net income attributable to noncontrolling interests |  |  |  | 0 |  |  |  | 0
Net income attributable to ONEOK |  |  |  | 313,200 |  |  |  | 858,800
Less: Preferred stock dividends | 300 |  |  | 200 |  |  | 800 | 800
Net income available to common shareholders | 308,900 |  |  | 313,000 |  |  | 957,500 | 858,000
Other comprehensive income (loss), net of tax | (94,400) |  |  | 23,400 |  |  | (226,000) | 65,600
Comprehensive income | 214,800 |  |  | 336,600 |  |  | 732,300 | 924,400
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 0 |  |  |  | 0
Comprehensive income attributable to ONEOK |  |  |  | 336,600 |  |  |  | 924,400
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 | 476,100 |  |  | 457,100 |  |  | 1,405,600 | 1,231,200
Other income (expense), net | 75,400 |  |  | 80,300 |  |  | 232,800 | 234,900
Interest expense, net | (78,100) |  |  | (80,300) |  |  | (235,500) | (234,900)
Income before income taxes | 473,400 |  |  | 457,100 |  |  | 1,402,900 | 1,231,200
Income taxes | 0 |  |  | 0 |  |  | 0 | 0
Net income | 473,400 |  |  | 457,100 |  |  | 1,402,900 | 1,231,200
Less: Net income attributable to noncontrolling interests |  |  |  | 0 |  |  |  | 0
Net income attributable to ONEOK |  |  |  | 457,100 |  |  |  | 1,231,200
Less: Preferred stock dividends | 0 |  |  | 0 |  |  | 0 | 0
Net income available to common shareholders | 473,400 |  |  | 457,100 |  |  | 1,402,900 | 1,231,200
Other comprehensive income (loss), net of tax | 12,400 |  |  | (3,700) |  |  | (9,000) | 4,000
Comprehensive income | 485,800 |  |  | 453,400 |  |  | 1,393,900 | 1,235,200
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 0 |  |  |  | 0
Comprehensive income attributable to ONEOK |  |  |  | 453,400 |  |  |  | 1,235,200
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 | 100 |  |  | 0 |  |  | 2,700 | 0
Operating income | (100) |  |  | 0 |  |  | (2,700) | 0
Equity in net earnings from investments | 476,200 |  |  | 457,100 |  |  | 1,408,300 | 1,231,200
Other income (expense), net | 78,100 |  |  | 80,300 |  |  | 235,500 | 234,900
Interest expense, net | (78,100) |  |  | (80,300) |  |  | (235,500) | (234,900)
Income before income taxes | 476,100 |  |  | 457,100 |  |  | 1,405,600 | 1,231,200
Income taxes | 0 |  |  | 0 |  |  | 0 | 0
Net income | 476,100 |  |  | 457,100 |  |  | 1,405,600 | 1,231,200
Less: Net income attributable to noncontrolling interests |  |  |  | 0 |  |  |  | 0
Net income attributable to ONEOK |  |  |  | 457,100 |  |  |  | 1,231,200
Less: Preferred stock dividends | 0 |  |  | 0 |  |  | 0 | 0
Net income available to common shareholders | 476,100 |  |  | 457,100 |  |  | 1,405,600 | 1,231,200
Other comprehensive income (loss), net of tax | 7,900 |  |  | (8,100) |  |  | (22,500) | (6,900)
Comprehensive income | 484,000 |  |  | 449,000 |  |  | 1,383,100 | 1,224,300
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 0 |  |  |  | 0
Comprehensive income attributable to ONEOK |  |  |  | 449,000 |  |  |  | 1,224,300
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 | 2,263,800 |  |  | 3,394,400 |  |  | 7,502,400 | 9,458,000
Cost of sales and fuel (exclusive of items shown separately below) | 1,414,500 |  |  | 2,560,800 |  |  | 4,996,700 | 7,104,600
Operating expenses | 367,800 |  |  | 336,300 |  |  | 1,076,500 | 986,800
(Gain) loss on sale of assets | (100) |  |  | (200) |  |  | 200 | (300)
Operating income | 481,600 |  |  | 497,500 |  |  | 1,429,000 | 1,366,900
Equity in net earnings from investments | 29,100 |  |  | 30,100 |  |  | 87,100 | 86,200
Other income (expense), net | 8,000 |  |  | (5,300) |  |  | 29,300 | (23,300)
Interest expense, net | (51,200) |  |  | (72,800) |  |  | (164,400) | (221,900)
Income before income taxes | 467,500 |  |  | 449,500 |  |  | 1,381,000 | 1,207,900
Income taxes | (3,000) |  |  | (700) |  |  | (10,800) | (7,900)
Net income | 464,500 |  |  | 448,800 |  |  | 1,370,200 | 1,200,000
Less: Net income attributable to noncontrolling interests |  |  |  | 700 |  |  |  | 3,300
Net income attributable to ONEOK |  |  |  | 448,100 |  |  |  | 1,196,700
Less: Preferred stock dividends | 0 |  |  | 0 |  |  | 0 | 0
Net income available to common shareholders | 464,500 |  |  | 448,100 |  |  | 1,370,200 | 1,196,700
Other comprehensive income (loss), net of tax | 5,000 |  |  | (7,300) |  |  | (20,600) | (8,000)
Comprehensive income | 469,500 |  |  | 441,500 |  |  | 1,349,600 | 1,192,000
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 700 |  |  |  | 3,300
Comprehensive income attributable to ONEOK |  |  |  | 440,800 |  |  |  | 1,188,700
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Commodity Sales |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,947,800 |  |  | 3,083,600 |  |  | 6,567,600 | 8,578,900
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | Services |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 316,000 |  |  | 310,800 |  |  | 934,800 | 879,100
Reportable Legal Entities | Total |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,263,200 |  |  | 3,393,900 |  |  | 7,500,800 | 9,456,500
Cost of sales and fuel (exclusive of items shown separately below) | 1,414,500 |  |  | 2,560,800 |  |  | 4,996,700 | 7,104,600
Operating expenses | 366,500 |  |  | 337,800 |  |  | 1,074,200 | 988,600
(Gain) loss on sale of assets | 0 |  |  | (200) |  |  | 2,900 | (300)
Operating income | 482,200 |  |  | 495,500 |  |  | 1,427,000 | 1,363,600
Equity in net earnings from investments | 37,600 |  |  | 39,300 |  |  | 115,200 | 116,100
Other income (expense), net | 16,400 |  |  | 4,000 |  |  | 52,900 | (200)
Interest expense, net | (129,600) |  |  | (121,900) |  |  | (362,500) | (351,100)
Income before income taxes | 406,600 |  |  | 416,900 |  |  | 1,232,600 | 1,128,400
Income taxes | (97,400) |  |  | (103,000) |  |  | (274,300) | (266,300)
Net income | 309,200 |  |  | 313,900 |  |  | 958,300 | 862,100
Less: Net income attributable to noncontrolling interests |  |  |  | 700 |  |  |  | 3,300
Net income attributable to ONEOK |  |  |  | 313,200 |  |  |  | 858,800
Less: Preferred stock dividends | 300 |  |  | 200 |  |  | 800 | 800
Net income available to common shareholders | 308,900 |  |  | 313,000 |  |  | 957,500 | 858,000
Other comprehensive income (loss), net of tax | (84,700) |  |  | 20,500 |  |  | (232,800) | 68,500
Comprehensive income | 224,500 |  |  | 334,400 |  |  | 725,500 | 930,600
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 700 |  |  |  | 3,300
Comprehensive income attributable to ONEOK |  |  |  | 333,700 |  |  |  | 927,300
Reportable Legal Entities | Total | Commodity Sales |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,947,800 |  |  | 3,083,600 |  |  | 6,567,600 | 8,578,900
Reportable Legal Entities | Total | Services |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 315,400 |  |  | 310,300 |  |  | 933,200 | 877,600
Consolidating Entries |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | (600) |  |  | (500) |  |  | (1,600) | (1,500)
Cost of sales and fuel (exclusive of items shown separately below) | 0 |  |  | 0 |  |  | 0 | 0
Operating expenses | (600) |  |  | (500) |  |  | (1,600) | (1,500)
(Gain) loss on sale of assets | 0 |  |  | 0 |  |  | 0 | 0
Operating income | 0 |  |  | 0 |  |  | 0 | 0
Equity in net earnings from investments | (1,414,000) |  |  | (1,362,300) |  |  | (4,178,700) | (3,659,100)
Other income (expense), net | (156,200) |  |  | (160,600) |  |  | (471,000) | (469,800)
Interest expense, net | 156,200 |  |  | 160,600 |  |  | 471,000 | 469,800
Income before income taxes | (1,414,000) |  |  | (1,362,300) |  |  | (4,178,700) | (3,659,100)
Income taxes | 0 |  |  | 0 |  |  | 0 | 0
Net income | (1,414,000) |  |  | (1,362,300) |  |  | (4,178,700) | (3,659,100)
Less: Net income attributable to noncontrolling interests |  |  |  | 0 |  |  |  | 0
Net income attributable to ONEOK |  |  |  | (1,362,300) |  |  |  | (3,659,100)
Less: Preferred stock dividends | 0 |  |  | 0 |  |  | 0 | 0
Net income available to common shareholders | (1,414,000) |  |  | (1,362,300) |  |  | (4,178,700) | (3,659,100)
Other comprehensive income (loss), net of tax | (15,600) |  |  | 16,200 |  |  | 45,300 | 13,800
Comprehensive income | (1,429,600) |  |  | (1,346,100) |  |  | (4,133,400) | (3,645,300)
Less: Comprehensive income attributable to noncontrolling interest |  |  |  | 0 |  |  |  | 0
Comprehensive income attributable to ONEOK |  |  |  | (1,346,100) |  |  |  | (3,645,300)
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 | $ (600) |  |  | $ (500) |  |  | $ (1,600) | $ (1,500)

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