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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |
Commodity sales |  |  |  |  |  |  |  |  | $ 11,395,642 | $ 9,862,652 | $ 6,858,456 |
Services |  |  |  |  |  |  |  |  | 1,197,554 | 2,311,255 | 2,062,478 |
Total revenues | $ 3,136,700 | $ 3,393,890 | $ 2,960,529 | $ 3,102,077 | $ 3,792,158 | $ 2,906,366 | $ 2,725,772 | $ 2,749,611 | 12,593,196 | 12,173,907 | 8,920,934 |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 9,422,708 | 9,538,045 | 6,496,124 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 0 | 15,970 | 0 |
Gain on sale of assets |  |  |  |  |  |  |  |  | (601) | (924) | (9,635) |
Operating income |  |  |  |  |  |  |  |  | 1,835,464 | 1,391,771 | 1,295,778 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 158,383 | 159,278 | 139,690 |
Impairment of equity investments |  |  |  |  |  |  |  |  | 0 | (4,270) | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | (469,620) | (485,658) | (469,651) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,517,935 | 1,040,801 | 957,956 |
Income taxes |  |  |  |  |  |  |  |  | (362,903) | (447,282) | (212,406) |
Income from continuing operations |  |  |  |  |  |  |  |  | 1,155,032 | 593,519 | 745,550 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | (2,051) |
Net income | 292,888 | 313,916 | 282,179 | 266,049 | 64,812 | 166,531 | 175,991 | 186,185 | 1,155,032 | 593,519 | 743,499 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 3,329 | 205,678 | 391,460 |
Net income attributable to ONEOK | 292,888 | 313,259 | 281,048 | 264,508 | 63,045 | 165,742 | 71,693 | 87,361 | 1,151,703 | 387,841 | 352,039 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 1,100 | 767 | 0 |
Net income available to common shareholders | $ 292,613 | $ 312,984 | $ 280,773 | $ 264,233 | $ 62,771 | $ 165,466 | $ 71,476 | $ 87,361 | $ 1,150,603 | $ 387,074 | 352,039 |
Northern Border Pipeline [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |  | 50.00%
Equity in net earnings from investments |  |  |  |  |  |  |  |  | $ 67,854 | $ 68,153 | 69,990 |
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Services |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating expenses |  |  |  |  |  |  |  |  | (600) | 17,800 | 18,700 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | 0 |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 300 |
Operating income |  |  |  |  |  |  |  |  | 600 | (17,800) | (19,000) |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 1,655,600 | 1,236,600 | 1,063,900 |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | 0 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | 29,600 | (12,300) | (5,000) |
Interest expense, net |  |  |  |  |  |  |  |  | (179,400) | (137,100) | (102,900) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,506,400 | 1,069,400 | 937,000 |
Income taxes |  |  |  |  |  |  |  |  | (354,700) | (480,200) | (199,000) |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 738,000 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 0 |
Net income |  |  |  |  |  |  |  |  | 1,151,700 | 589,200 | 738,000 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 201,400 | 386,000 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,151,700 | 387,800 | 352,000 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 1,100 | 800 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | 1,150,600 | 387,000 |  |
Reportable Legal Entities | Subsidiary Issuer & Guarantor |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Services |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Total 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 on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | 0 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | 315,100 | 353,100 | 373,500 |
Interest expense, net |  |  |  |  |  |  |  |  | (315,100) | (353,100) | (373,500) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 1,066,800 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 0 |
Net income |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 |  |
Reportable Legal Entities | Guarantor Subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Services |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating expenses |  |  |  |  |  |  |  |  | 0 | 9,200 | 0 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | 0 |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income |  |  |  |  |  |  |  |  | 0 | (9,200) | 0 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 1,660,500 | 1,224,900 | 1,066,800 |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | 0 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | 315,100 | 353,100 | 373,500 |
Interest expense, net |  |  |  |  |  |  |  |  | (315,100) | (353,100) | (373,500) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 1,066,800 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 0 |
Net income |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 | 1,066,800 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | 1,660,500 | 1,215,700 |  |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 11,395,600 | 9,862,700 | 6,858,500 |
Services |  |  |  |  |  |  |  |  | 1,199,700 | 2,313,200 | 2,064,300 |
Total revenues |  |  |  |  |  |  |  |  | 12,595,300 | 12,175,900 | 8,922,800 |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 9,422,700 | 9,538,000 | 6,496,100 |
Operating expenses |  |  |  |  |  |  |  |  | 1,338,300 | 1,204,000 | 1,121,800 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | 16,000 |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | (600) | (900) | (9,900) |
Operating income |  |  |  |  |  |  |  |  | 1,834,900 | 1,418,800 | 1,314,800 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 116,300 | 100,700 | 69,700 |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | (4,300) |  |
Other income (expense), net |  |  |  |  |  |  |  |  | (36,000) | (8,000) | (2,800) |
Interest expense, net |  |  |  |  |  |  |  |  | (290,200) | (348,600) | (366,800) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,625,000 | 1,158,600 | 1,014,900 |
Income taxes |  |  |  |  |  |  |  |  | (8,200) | 32,900 | (13,400) |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 1,001,500 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | (2,100) |
Net income |  |  |  |  |  |  |  |  | 1,616,800 | 1,191,500 | 999,400 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 3,300 | 4,300 | 5,500 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,613,500 | 1,187,200 | 993,900 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | 1,613,500 | 1,187,200 |  |
Reportable Legal Entities | Total |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 11,395,600 | 9,862,700 | 6,858,500 |
Services |  |  |  |  |  |  |  |  | 1,197,600 | 2,311,200 | 2,062,500 |
Total revenues |  |  |  |  |  |  |  |  | 12,593,200 | 12,173,900 | 8,921,000 |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 9,422,700 | 9,538,000 | 6,496,100 |
Operating expenses |  |  |  |  |  |  |  |  | 1,335,600 | 1,229,000 | 1,138,700 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | 16,000 |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | (600) | (900) | (9,600) |
Operating income |  |  |  |  |  |  |  |  | 1,835,500 | 1,391,800 | 1,295,800 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | 158,400 | 159,300 | 139,700 |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | (4,300) |  |
Other income (expense), net |  |  |  |  |  |  |  |  | (6,400) | (20,300) | (7,800) |
Interest expense, net |  |  |  |  |  |  |  |  | (469,600) | (485,700) | (469,700) |
Income before income taxes |  |  |  |  |  |  |  |  | 1,517,900 | 1,040,800 | 958,000 |
Income taxes |  |  |  |  |  |  |  |  | (362,900) | (447,300) | (212,400) |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 745,600 |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | (2,100) |
Net income |  |  |  |  |  |  |  |  | 1,155,000 | 593,500 | 743,500 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 3,300 | 205,700 | 391,500 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,151,700 | 387,800 | 352,000 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 1,100 | 800 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | 1,150,600 | 387,000 |  |
Consolidating Entries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Services |  |  |  |  |  |  |  |  | (2,100) | (2,000) | (1,800) |
Total revenues |  |  |  |  |  |  |  |  | (2,100) | (2,000) | (1,800) |
Cost of sales and fuel (exclusive of items shown separately below) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating expenses |  |  |  |  |  |  |  |  | (2,100) | (2,000) | (1,800) |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | 0 |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Equity in net earnings from investments |  |  |  |  |  |  |  |  | (4,934,500) | (3,618,600) | (3,127,500) |
Impairment of equity investments |  |  |  |  |  |  |  |  |  | 0 |  |
Other income (expense), net |  |  |  |  |  |  |  |  | (630,200) | (706,200) | (747,000) |
Interest expense, net |  |  |  |  |  |  |  |  | 630,200 | 706,200 | 747,000 |
Income before income taxes |  |  |  |  |  |  |  |  | (4,934,500) | (3,618,600) | (3,127,500) |
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | (3,127,500) |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | 0 |
Net income |  |  |  |  |  |  |  |  | (4,934,500) | (3,618,600) | (3,127,500) |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | (4,934,500) | (3,618,600) | $ (3,127,500) |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ (4,934,500) | $ (3,618,600) |  |

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