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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)