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REVENUE REVENUE (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings increase | $ 0 |  | $ 0 |  |  | $ 0
Commodity sales | 3,083,625,000 | $ 2,322,534,000 | 8,578,891,000 | $ 6,700,260,000 |  |
Services revenue | 310,265,000 | 583,832,000 | 877,605,000 | 1,681,489,000 |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | 2,560,765,000 | 2,229,416,000 | 7,104,609,000 | 6,464,281,000 |  |
Depreciation and amortization | 107,383,000 | 102,298,000 | 317,908,000 | 302,566,000 |  |
Income taxes | 102,983,000 | 97,128,000 | 266,285,000 | 195,913,000 |  |
Net income | 313,916,000 | 166,531,000 | 862,144,000 | 528,707,000 |  |
Net income attributable to noncontrolling interest | 657,000 | 789,000 | 3,329,000 | 203,911,000 |  |
Net income attributable to ONEOK | 313,259,000 | $ 165,742,000 | 858,815,000 | $ 324,796,000 |  |
Accounts receivable, net | 1,085,075,000 |  | 1,085,075,000 |  |  | 1,202,951,000
Natural gas and natural gas liquids in storage | 426,293,000 |  | 426,293,000 |  |  | 342,293,000
Other assets, current | 61,340,000 |  | 61,340,000 |  |  | 53,008,000
Property, plant and equipment | 17,120,187,000 |  | 17,120,187,000 |  |  | 15,559,667,000
Accumulated depreciation and amortization | 3,159,660,000 |  | 3,159,660,000 |  |  | 2,861,541,000
Other assets | 191,170,000 |  | 191,170,000 |  |  | 180,830,000
Accounts payable | 1,339,507,000 |  | 1,339,507,000 |  |  | 1,140,571,000
Other current liabilities | 208,312,000 |  | 208,312,000 |  |  | 179,971,000
Deferred income taxes | 132,242,000 |  | 132,242,000 |  |  | 52,697,000
Other deferred credits | 350,400,000 |  | 350,400,000 |  |  | 348,924,000
Retained earnings/paid-in capital | 7,662,673,000 |  | 7,662,673,000 |  |  | 6,588,878,000
Noncontrolling interests in consolidated subsidiaries | 0 |  | 0 |  |  | 157,485,000
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |
Accounts receivable, net | 1,077,700,000 |  | 1,077,700,000 |  |  | $ 1,200,000,000
Contract with customer, asset | 7,700,000 |  | 7,700,000 |  | $ 6,400,000 |
Amounts invoiced in excess of revenue recognized | 700,000.0 |  | 700,000.0 |  |  |
Net additions | 2,000,000.0 |  | 2,000,000.0 |  |  |
Contract with customer, asset, net, current | 2,900,000 |  | 2,900,000 |  | 900,000 |
Contract with customer, asset, net, noncurrent | 4,800,000 |  | 4,800,000 |  |  |
Contract with customer, liability | 38,300,000.0 |  | 38,300,000.0 |  | 33,300,000.0 |
Revenue recognized included in beginning balance |  |  | (19,000,000.0) |  |  |
Net additions | 24,000,000.0 |  | 24,000,000.0 |  |  |
Contract with customer, liability, current | 23,800,000 |  | 23,800,000 |  | 19,500,000 |
Contract with customer, liability, noncurrent | 14,500,000 |  | 14,500,000 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 1,960,100,000 |  | 1,960,100,000 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Commodity sales | 3,129,947,000 |  | 8,625,213,000 |  |  |
Services revenue | 707,633,000 |  | 1,986,563,000 |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | 3,005,767,000 |  | 8,255,457,000 |  |  |
Depreciation and amortization | 107,238,000 |  | 317,472,000 |  |  |
Income taxes | 102,714,000 |  | 267,404,000 |  |  |
Net income | 313,018,000 |  | 865,893,000 |  |  |
Net income attributable to noncontrolling interest | 655,000 |  | 3,322,000 |  |  |
Net income attributable to ONEOK | 312,363,000 |  | 862,571,000 |  |  |
Accounts receivable, net | 1,214,627,000 |  | 1,214,627,000 |  |  |
Natural gas and natural gas liquids in storage | 439,035,000 |  | 439,035,000 |  |  |
Other assets, current | 60,198,000 |  | 60,198,000 |  |  |
Property, plant and equipment | 17,098,053,000 |  | 17,098,053,000 |  |  |
Accumulated depreciation and amortization | 3,157,852,000 |  | 3,157,852,000 |  |  |
Other assets | 186,417,000 |  | 186,417,000 |  |  |
Accounts payable | 1,469,059,000 |  | 1,469,059,000 |  |  |
Other current liabilities | 206,658,000 |  | 206,658,000 |  |  |
Deferred income taxes | 132,859,000 |  | 132,859,000 |  |  |
Other deferred credits | 335,909,000 |  | 335,909,000 |  |  |
Retained earnings/paid-in capital | 7,664,722,000 |  | 7,664,722,000 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Commodity sales | (46,322,000) |  | (46,322,000) |  |  |
Services revenue | (397,368,000) |  | (1,108,958,000) |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (445,002,000) |  | (1,150,848,000) |  |  |
Depreciation and amortization | 145,000 |  | 436,000 |  |  |
Income taxes | 269,000 |  | (1,119,000) |  |  |
Net income | 898,000 |  | (3,749,000) |  |  |
Net income attributable to noncontrolling interest | 2,000 |  | 7,000 |  |  |
Net income attributable to ONEOK | 896,000 |  | (3,756,000) |  |  |
Accounts receivable, net | (129,552,000) |  | (129,552,000) |  |  |
Natural gas and natural gas liquids in storage | (12,742,000) |  | (12,742,000) |  |  |
Other assets, current | 1,142,000 |  | 1,142,000 |  |  |
Property, plant and equipment | 22,134,000 |  | 22,134,000 |  |  |
Accumulated depreciation and amortization | 1,808,000 |  | 1,808,000 |  |  |
Other assets | 4,753,000 |  | 4,753,000 |  |  |
Accounts payable | (129,552,000) |  | (129,552,000) |  |  |
Other current liabilities | 1,654,000 |  | 1,654,000 |  |  |
Deferred income taxes | (617,000) |  | (617,000) |  |  |
Other deferred credits | 14,491,000 |  | 14,491,000 |  |  |
Retained earnings/paid-in capital | (2,049,000) |  | (2,049,000) |  |  |
2018 [Member] |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 90,500,000 |  | 90,500,000 |  |  |
2019 [Member] |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 296,200,000 |  | 296,200,000 |  |  |
2020 [Member] |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 245,100,000 |  | 245,100,000 |  |  |
2021 [Member] |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 237,400,000 |  | 237,400,000 |  |  |
Thereafter [Member] |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, Remaining Performance Obligation | $ 1,090,900,000 |  | $ 1,090,900,000 |  |  |
Retained Earnings |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings increase |  |  |  |  | $ 1,700,000 |

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