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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Comprehensive Income (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]        
Net income $ 313,916 $ 166,531 $ 862,144 $ 528,707
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax (3,526) (20,620) 10,729 (1,287)
Realized (gains) losses on derivatives in net income, net of tax (19,261) (13,062) (43,397) (40,272)
Change in pension and postretirement benefit plan liability, net of tax (3,236) (2,041) (9,086) (6,122)
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 1,480 (169) 5,281 (1,214)
Total other comprehensive income (loss), net of tax 20,451 (5,686) 68,493 43,893
Comprehensive income 334,367 160,845 930,637 572,600
Less: Comprehensive income attributable to noncontrolling interests 657 789 3,329 234,937
Comprehensive income attributable to ONEOK 333,710 160,056 927,308 337,663
Reportable Legal Entities | Parent Issuer & Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Net income 313,200 165,800 858,800 526,200
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax 20,200 18,400 54,000 18,100
Realized (gains) losses on derivatives in net income, net of tax 0 600 1,900 1,600
Change in pension and postretirement benefit plan liability, net of tax 3,200 2,000 9,700 6,100
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 0 0 0 0
Total other comprehensive income (loss), net of tax 23,400 21,000 65,600 25,800
Comprehensive income 336,600 186,800 924,400 552,000
Less: Comprehensive income attributable to noncontrolling interests 0 0 0 232,400
Comprehensive income attributable to ONEOK 336,600 186,800 924,400 319,600
Reportable Legal Entities | Subsidiary Issuer & Guarantor        
Condensed Financial Statements, Captions [Line Items]        
Net income 457,100 298,300 1,231,200 845,900
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax (30,700) (61,900) (56,200) (38,800)
Realized (gains) losses on derivatives in net income, net of tax 25,000 19,800 53,900 50,700
Change in pension and postretirement benefit plan liability, net of tax 0 0 (600) 0
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 2,000 (300) 6,900 (1,500)
Total other comprehensive income (loss), net of tax (3,700) (42,400) 4,000 10,400
Comprehensive income 453,400 255,900 1,235,200 856,300
Less: Comprehensive income attributable to noncontrolling interests 0 0 0 0
Comprehensive income attributable to ONEOK 453,400 255,900 1,235,200 856,300
Reportable Legal Entities | Guarantor Subsidiary        
Condensed Financial Statements, Captions [Line Items]        
Net income 457,100 298,300 1,231,200 845,900
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax (30,700) (42,400) (56,200) (6,100)
Realized (gains) losses on derivatives in net income, net of tax 20,600 15,900 42,400 38,000
Change in pension and postretirement benefit plan liability, net of tax 0 0 0 0
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 2,000 (300) 6,900 (1,500)
Total other comprehensive income (loss), net of tax (8,100) (26,800) (6,900) 30,400
Comprehensive income 449,000 271,500 1,224,300 876,300
Less: Comprehensive income attributable to noncontrolling interests 0 0 0 0
Comprehensive income attributable to ONEOK 449,000 271,500 1,224,300 876,300
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries        
Condensed Financial Statements, Captions [Line Items]        
Net income 448,800 288,800 1,200,000 806,400
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax (23,700) (19,500) (43,300) 13,300
Realized (gains) losses on derivatives in net income, net of tax 14,900 8,600 30,000 26,000
Change in pension and postretirement benefit plan liability, net of tax 0 0 0 0
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 1,500 (200) 5,300 (1,200)
Total other comprehensive income (loss), net of tax (7,300) (11,100) (8,000) 38,100
Comprehensive income 441,500 277,700 1,192,000 844,500
Less: Comprehensive income attributable to noncontrolling interests 700 700 3,300 2,500
Comprehensive income attributable to ONEOK 440,800 277,000 1,188,700 842,000
Reportable Legal Entities | Total        
Condensed Financial Statements, Captions [Line Items]        
Net income 313,900 166,500 862,100 528,700
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax (3,500) (20,600) 10,700 (1,300)
Realized (gains) losses on derivatives in net income, net of tax 19,300 13,100 43,400 40,300
Change in pension and postretirement benefit plan liability, net of tax 3,200 2,000 9,100 6,100
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax 1,500 (200) 5,300 (1,200)
Total other comprehensive income (loss), net of tax 20,500 (5,700) 68,500 43,900
Comprehensive income 334,400 160,800 930,600 572,600
Less: Comprehensive income attributable to noncontrolling interests 700 700 3,300 234,900
Comprehensive income attributable to ONEOK 333,700 160,100 927,300 337,700
Consolidating Entries        
Condensed Financial Statements, Captions [Line Items]        
Net income (1,362,300) (884,700) (3,659,100) (2,495,700)
Other comprehensive income (loss), net of tax        
Unrealized gains (losses) on derivatives, net of tax 61,400 84,800 112,400 12,200
Realized (gains) losses on derivatives in net income, net of tax (41,200) (31,800) (84,800) (76,000)
Change in pension and postretirement benefit plan liability, net of tax 0 0 0 0
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax (4,000) 600 (13,800) 3,000
Total other comprehensive income (loss), net of tax 16,200 53,600 13,800 (60,800)
Comprehensive income (1,346,100) (831,100) (3,645,300) (2,556,500)
Less: Comprehensive income attributable to noncontrolling interests 0 0 0 0
Comprehensive income attributable to ONEOK $ (1,346,100) $ (831,100) $ (3,645,300) $ (2,556,500)