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REVENUE REVENUE (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings increase | $ 0 |  | $ 0 |  |  | $ 0
Services revenue | 285,267,000 | $ 564,763,000 | 567,340,000 | $ 1,097,657,000 |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | 2,175,818,000 | 2,091,022,000 | 4,543,844,000 | 4,234,865,000 |  |
Depreciation and amortization | 106,288,000 | 100,849,000 | 210,525,000 | 200,268,000 |  |
Income taxes | 87,531,000 | 43,844,000 | 163,302,000 | 98,785,000 |  |
Net income | 282,179,000 | 175,991,000 | 548,228,000 | 362,176,000 |  |
Net Income Attributable to Noncontrolling Interests | 1,131,000 | 104,298,000 | 2,672,000 | 203,122,000 |  |
Net Income Attributable to ONEOK | 281,048,000 | $ 71,693,000 | 545,556,000 | $ 159,054,000 |  |
Accounts receivable, net | 934,664,000 |  | 934,664,000 |  |  | 1,202,951,000
Natural gas and natural gas liquids in storage | 285,776,000 |  | 285,776,000 |  |  | 342,293,000
Other current assets | 57,286,000 |  | 57,286,000 |  |  | 53,008,000
Property, plant and equipment | 16,363,716,000 |  | 16,363,716,000 |  |  | 15,559,667,000
Accumulated depreciation and amortization | 3,059,799,000 |  | 3,059,799,000 |  |  | 2,861,541,000
Deferred income taxes | 31,503,000 |  | 31,503,000 |  |  | 205,907,000
Other assets | 170,124,000 |  | 170,124,000 |  |  | 180,830,000
Accounts payable | 1,027,467,000 |  | 1,027,467,000 |  |  | 1,140,571,000
Other current liabilities | 184,127,000 |  | 184,127,000 |  |  | 179,971,000
Other deferred credits | 357,184,000 |  | 357,184,000 |  |  | 348,924,000
Retained earnings/paid-in capital | 7,699,934,000 |  | 7,699,934,000 |  |  | 6,588,878,000
Noncontrolling interests in consolidated subsidiaries | 173,623,000 |  | 173,623,000 |  |  | 157,485,000
Customer receivables | 926,100,000 |  | 926,100,000 |  |  | $ 1,200,000,000
Contract asset balance | 6,400,000 |  | 6,400,000 |  | $ 6,400,000 |
Cash received in excess of revenue recognized | (400,000.0) |  | (400,000.0) |  |  |
Contract Asset Net Additions | 400,000.0 |  | 400,000.0 |  |  |
Contract with Customer, Asset, Net, Current | 1,400,000 |  | 1,400,000 |  | 900,000 |
Contract with Customer, Asset, Net, Noncurrent | 5,000,000 |  | 5,000,000 |  |  |
Contract with Customer, Liability | 42,800,000.0 |  | 42,800,000.0 |  | 33,300,000.0 |
Revenue recognized included in beginning balance |  |  | (18,300,000.0) |  |  |
Contract Liability, Net Additions | 27,800,000.0 |  | 27,800,000.0 |  |  |
Contract with Customer, Liability, Current | 27,800,000 |  | 27,800,000 |  | 19,500,000 |
Contract with Customer, Liability, Noncurrent | 15,000,000 |  | 15,000,000 |  |  |
Performance obligations expected to be recognized in revenue | 1,952,100,000.0 |  | 1,952,100,000.0 |  |  |
2018 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Performance obligations expected to be recognized in revenue | 168,458,491.0 |  | 168,458,491.0 |  |  |
2019 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Performance obligations expected to be recognized in revenue | 271,597,497.0 |  | 271,597,497.0 |  |  |
2020 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Performance obligations expected to be recognized in revenue | 226,139,404.0 |  | 226,139,404.0 |  |  |
2021 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Performance obligations expected to be recognized in revenue | 219,194,609.0 |  | 219,194,609.0 |  |  |
Thereafter [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Performance obligations expected to be recognized in revenue | 1,066,738,432.0 |  | 1,066,738,432.0 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Services revenue | 644,615,000 |  | 1,278,930,000 |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | 2,523,916,000 |  | 5,249,690,000 |  |  |
Depreciation and amortization | 106,142,000 |  | 210,234,000 |  |  |
Income taxes | 90,151,000 |  | 164,690,000 |  |  |
Net income | 290,955,000 |  | 552,875,000 |  |  |
Net Income Attributable to Noncontrolling Interests | 1,128,000 |  | 2,667,000 |  |  |
Net Income Attributable to ONEOK | 289,827,000 |  | 550,208,000 |  |  |
Accounts receivable, net | 1,056,974,000 |  | 1,056,974,000 |  |  |
Natural gas and natural gas liquids in storage | 299,616,000 |  | 299,616,000 |  |  |
Other current assets | 56,230,000 |  | 56,230,000 |  |  |
Property, plant and equipment | 16,341,524,000 |  | 16,341,524,000 |  |  |
Accumulated depreciation and amortization | 3,058,136,000 |  | 3,058,136,000 |  |  |
Deferred income taxes | 30,617,000 |  | 30,617,000 |  |  |
Other assets | 165,130,000 |  | 165,130,000 |  |  |
Accounts payable | 1,149,777,000 |  | 1,149,777,000 |  |  |
Other current liabilities | 182,577,000 |  | 182,577,000 |  |  |
Other deferred credits | 342,162,000 |  | 342,162,000 |  |  |
Retained earnings/paid-in capital | 7,702,903,000 |  | 7,702,903,000 |  |  |
Noncontrolling interests in consolidated subsidiaries | 173,601,000 |  | 173,601,000 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Services revenue | (359,348,000) |  | (711,590,000) |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (348,098,000) |  | (705,846,000) |  |  |
Depreciation and amortization | 146,000 |  | 291,000 |  |  |
Income taxes | (2,620,000) |  | (1,388,000) |  |  |
Net income | (8,776,000) |  | (4,647,000) |  |  |
Net Income Attributable to Noncontrolling Interests | 3,000 |  | 5,000 |  |  |
Net Income Attributable to ONEOK | (8,779,000) |  | (4,652,000) |  |  |
Accounts receivable, net | (122,310,000) |  | (122,310,000) |  |  |
Natural gas and natural gas liquids in storage | (13,840,000) |  | (13,840,000) |  |  |
Other current assets | 1,056,000 |  | 1,056,000 |  |  |
Property, plant and equipment | 22,192,000 |  | 22,192,000 |  |  |
Accumulated depreciation and amortization | 1,663,000 |  | 1,663,000 |  |  |
Deferred income taxes | 886,000 |  | 886,000 |  |  |
Other assets | 4,994,000 |  | 4,994,000 |  |  |
Accounts payable | (122,310,000) |  | (122,310,000) |  |  |
Other current liabilities | 1,550,000 |  | 1,550,000 |  |  |
Other deferred credits | 15,022,000 |  | 15,022,000 |  |  |
Retained earnings/paid-in capital | (2,969,000) |  | (2,969,000) |  |  |
Noncontrolling interests in consolidated subsidiaries | $ 22,000 |  | $ 22,000 |  |  |
Retained Earnings |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings increase |  |  |  |  | $ 1,700,000 |

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