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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 282,179 | $ 175,991 | $ 548,228 | $ 362,176
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (20,269) | (5,123) | 14,255 | 19,333
Realized (gains) losses on derivatives in net income, net of tax | (12,160) | (9,927) | (24,136) | (27,210)
Change in pension and postretirement benefit plan liability, net of tax | (3,235) | (2,040) | (5,850) | (4,081)
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | 977 | (1,370) | 3,801 | (1,045)
Total other comprehensive income (loss), net of tax | (3,897) | 5,474 | 48,042 | 49,579
Comprehensive income | 278,282 | 181,465 | 596,270 | 411,755
Less: Comprehensive income attributable to noncontrolling interests | 1,131 | 106,507 | 2,672 | 234,148
Comprehensive income attributable to ONEOK | 277,151 | 74,958 | 593,598 | 177,607
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 281,100 | 175,100 | 545,600 | 360,400
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 15,500 | (300) | 33,900 | (300)
Realized (gains) losses on derivatives in net income, net of tax | 1,000 | 500 | 1,900 | 1,000
Change in pension and postretirement benefit plan liability, net of tax | 3,200 | 2,100 | 6,400 | 4,100
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | 0 | 0 | 0 | 0
Total other comprehensive income (loss), net of tax | 19,700 | 2,300 | 42,200 | 4,800
Comprehensive income | 300,800 | 177,400 | 587,800 | 365,200
Less: Comprehensive income attributable to noncontrolling interests | 0 | 105,600 | 0 | 232,400
Comprehensive income attributable to ONEOK | 300,800 | 71,800 | 587,800 | 132,800
Reportable Legal Entities | Subsidiary Issuer & Guarantor |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 403,200 | 278,500 | 774,100 | 547,600
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (46,400) | (5,700) | (25,500) | 23,100
Realized (gains) losses on derivatives in net income, net of tax | 14,600 | 11,100 | 28,900 | 30,900
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 | 1,200 | (1,600) | 4,900 | (1,200)
Total other comprehensive income (loss), net of tax | (30,600) | 3,800 | 7,700 | 52,800
Comprehensive income | 372,600 | 282,300 | 781,800 | 600,400
Less: Comprehensive income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to ONEOK | 372,600 | 282,300 | 781,800 | 600,400
Reportable Legal Entities | Guarantor Subsidiary |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 403,200 | 278,500 | 774,100 | 547,600
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (46,400) | 9,000 | (25,500) | 36,300
Realized (gains) losses on derivatives in net income, net of tax | 10,200 | 6,800 | 21,800 | 22,100
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 | 1,200 | (1,600) | 4,900 | (1,200)
Total other comprehensive income (loss), net of tax | (35,000) | 14,200 | 1,200 | 57,200
Comprehensive income | 368,200 | 292,700 | 775,300 | 604,800
Less: Comprehensive income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to ONEOK | 368,200 | 292,700 | 775,300 | 604,800
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 392,800 | 266,700 | 751,200 | 517,600
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (35,800) | 9,800 | (19,600) | 32,800
Realized (gains) losses on derivatives in net income, net of tax | 6,900 | 5,100 | 15,100 | 17,400
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 | 1,000 | (1,400) | 3,800 | (1,000)
Total other comprehensive income (loss), net of tax | (27,900) | 13,500 | (700) | 49,200
Comprehensive income | 364,900 | 280,200 | 750,500 | 566,800
Less: Comprehensive income attributable to noncontrolling interests | 1,100 | 900 | 2,600 | 1,800
Comprehensive income attributable to ONEOK | 363,800 | 279,300 | 747,900 | 565,000
Reportable Legal Entities | Total |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 282,200 | 176,000 | 548,200 | 362,200
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | (20,300) | (5,100) | 14,300 | 19,300
Realized (gains) losses on derivatives in net income, net of tax | 12,200 | 9,900 | 24,100 | 27,200
Change in pension and postretirement benefit plan liability, net of tax | 3,200 | 2,100 | 5,800 | 4,100
Other comprehensive income (loss) on investments in unconsolidated affiliates, net of tax | 1,000 | (1,400) | 3,800 | (1,000)
Total other comprehensive income (loss), net of tax | (3,900) | 5,500 | 48,000 | 49,600
Comprehensive income | 278,300 | 181,500 | 596,200 | 411,800
Less: Comprehensive income attributable to noncontrolling interests | 1,100 | 106,500 | 2,600 | 234,200
Comprehensive income attributable to ONEOK | 277,200 | 75,000 | 593,600 | 177,600
Consolidating Entries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (1,198,100) | (822,800) | (2,296,800) | (1,611,000)
Other comprehensive income (loss), net of tax |  |  |  |
Unrealized gains (losses) on derivatives, net of tax | 92,800 | (17,900) | 51,000 | (72,600)
Realized (gains) losses on derivatives in net income, net of tax | (20,500) | (13,600) | (43,600) | (44,200)
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 | (2,400) | 3,200 | (9,800) | 2,400
Total other comprehensive income (loss), net of tax | 69,900 | (28,300) | (2,400) | (114,400)
Comprehensive income | (1,128,200) | (851,100) | (2,299,200) | (1,725,400)
Less: Comprehensive income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to ONEOK | $ (1,128,200) | $ (851,100) | $ (2,299,200) | $ (1,725,400)

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