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REVENUES (Details) - USD ($) | 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 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings increase | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |
Commodity sales |  |  |  |  |  |  |  |  | 11,395,642,000 | 9,862,652,000 | $ 6,858,456,000 |
Services |  |  |  |  |  |  |  |  | 1,197,554,000 | 2,311,255,000 | 2,062,478,000 |
Cost of sales and fuel (exclusive of depreciation and operating costs) |  |  |  |  |  |  |  |  | 9,422,708,000 | 9,538,045,000 | 6,496,124,000 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 428,557,000 | 406,335,000 | 391,585,000 |
Income taxes |  |  |  |  |  |  |  |  | 362,903,000 | 447,282,000 | 212,406,000 |
Net income | 292,888,000 | $ 313,916,000 | $ 282,179,000 | $ 266,049,000 | 64,812,000 | $ 166,531,000 | $ 175,991,000 | $ 186,185,000 | 1,155,032,000 | 593,519,000 | 743,499,000 |
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 3,329,000 | 205,678,000 | 391,460,000 |
Net income attributable to ONEOK | 292,888,000 | $ 313,259,000 | $ 281,048,000 | $ 264,508,000 | 63,045,000 | $ 165,742,000 | $ 71,693,000 | $ 87,361,000 | 1,151,703,000 | 387,841,000 | $ 352,039,000 |
Accounts receivable, net | 818,958,000 |  |  |  | 1,202,951,000 |  |  |  | 818,958,000 | 1,202,951,000 |  |
Natural gas and natural gas liquids in storage | 296,667,000 |  |  |  | 342,293,000 |  |  |  | 296,667,000 | 342,293,000 |  |
Other current assets | 100,808,000 |  |  |  | 53,008,000 |  |  |  | 100,808,000 | 53,008,000 |  |
Property, plant and equipment | 18,030,963,000 |  |  |  | 15,559,667,000 |  |  |  | 18,030,963,000 | 15,559,667,000 |  |
Accumulated depreciation and amortization | 3,264,312,000 |  |  |  | 2,861,541,000 |  |  |  | 3,264,312,000 | 2,861,541,000 |  |
Other assets | 130,096,000 |  |  |  | 180,830,000 |  |  |  | 130,096,000 | 180,830,000 |  |
Accounts payable | 1,118,102,000 |  |  |  | 1,140,571,000 |  |  |  | 1,118,102,000 | 1,140,571,000 |  |
Other current liabilities | 211,110,000 |  |  |  | 179,971,000 |  |  |  | 211,110,000 | 179,971,000 |  |
Deferred income taxes | 219,731,000 |  |  |  | 52,697,000 |  |  |  | 219,731,000 | 52,697,000 |  |
Other deferred credits | 450,627,000 |  |  |  | 348,924,000 |  |  |  | 450,627,000 | 348,924,000 |  |
Retained earnings/paid-in capital | 7,615,138,000 |  |  |  | 6,588,878,000 |  |  |  | 7,615,138,000 | 6,588,878,000 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 800,000,000 |  |  |  | $ 1,200,000,000 |  |  |  | 800,000,000 | $ 1,200,000,000 |  |
Amounts invoiced in excess of revenue recognized | (900,000.0) |  |  |  |  |  |  |  | (900,000.0) |  |  |
Net additions | 700,000.0 |  |  |  |  |  |  |  | 700,000.0 |  |  |
Contract with customer, asset | 6,200,000 |  |  |  |  |  |  |  | 6,200,000 |  |  | $ 6,400,000
Contract with customer, asset, net, current | 1,700,000 |  |  |  |  |  |  |  | 1,700,000 |  |  | 900,000
Contract with customer, asset, net, noncurrent | 4,500,000 |  |  |  |  |  |  |  | 4,500,000 |  |  |
Revenue recognized included in beginning balance |  |  |  |  |  |  |  |  | (19,500,000.0) |  |  |
Net additions | 17,900,000.0 |  |  |  |  |  |  |  | 17,900,000.0 |  |  |
Contract with customer, liability | 31,700,000.0 |  |  |  |  |  |  |  | 31,700,000.0 |  |  | 33,300,000.0
Contract with customer, liability, current | 15,600,000 |  |  |  |  |  |  |  | 15,600,000 |  |  | 19,500,000
Contract with customer, liability, noncurrent | 16,100,000 |  |  |  |  |  |  |  | 16,100,000 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 1,891,800,000 |  |  |  |  |  |  |  | 1,891,800,000 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | 11,460,913,000 |  |  |
Services |  |  |  |  |  |  |  |  | 2,712,256,000 |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) |  |  |  |  |  |  |  |  | 11,006,278,000 |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 427,976,000 |  |  |
Income taxes |  |  |  |  |  |  |  |  | 362,210,000 |  |  |
Net income |  |  |  |  |  |  |  |  | 1,152,709,000 |  |  |
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 3,322,000 |  |  |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 1,149,387,000 |  |  |
Accounts receivable, net | 956,523,000 |  |  |  |  |  |  |  | 956,523,000 |  |  |
Natural gas and natural gas liquids in storage | 301,555,000 |  |  |  |  |  |  |  | 301,555,000 |  |  |
Other current assets | 99,579,000 |  |  |  |  |  |  |  | 99,579,000 |  |  |
Property, plant and equipment | 18,006,653,000 |  |  |  |  |  |  |  | 18,006,653,000 |  |  |
Accumulated depreciation and amortization | 3,262,359,000 |  |  |  |  |  |  |  | 3,262,359,000 |  |  |
Other assets | 125,606,000 |  |  |  |  |  |  |  | 125,606,000 |  |  |
Accounts payable | 1,255,667,000 |  |  |  |  |  |  |  | 1,255,667,000 |  |  |
Other current liabilities | 209,258,000 |  |  |  |  |  |  |  | 209,258,000 |  |  |
Deferred income taxes | 218,536,000 |  |  |  |  |  |  |  | 218,536,000 |  |  |
Other deferred credits | 434,508,000 |  |  |  |  |  |  |  | 434,508,000 |  |  |
Retained earnings/paid-in capital | 7,611,116,000 |  |  |  |  |  |  |  | 7,611,116,000 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity sales |  |  |  |  |  |  |  |  | (65,271,000) |  |  |
Services |  |  |  |  |  |  |  |  | (1,514,702,000) |  |  |
Cost of sales and fuel (exclusive of depreciation and operating costs) |  |  |  |  |  |  |  |  | (1,583,570,000) |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 581,000 |  |  |
Income taxes |  |  |  |  |  |  |  |  | 693,000 |  |  |
Net income |  |  |  |  |  |  |  |  | 2,323,000 |  |  |
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 7,000 |  |  |
Net income attributable to ONEOK |  |  |  |  |  |  |  |  | 2,316,000 |  |  |
Accounts receivable, net | (137,565,000) |  |  |  |  |  |  |  | (137,565,000) |  |  |
Natural gas and natural gas liquids in storage | (4,888,000) |  |  |  |  |  |  |  | (4,888,000) |  |  |
Other current assets | 1,229,000 |  |  |  |  |  |  |  | 1,229,000 |  |  |
Property, plant and equipment | 24,310,000 |  |  |  |  |  |  |  | 24,310,000 |  |  |
Accumulated depreciation and amortization | 1,953,000 |  |  |  |  |  |  |  | 1,953,000 |  |  |
Other assets | 4,490,000 |  |  |  |  |  |  |  | 4,490,000 |  |  |
Accounts payable | (137,565,000) |  |  |  |  |  |  |  | (137,565,000) |  |  |
Other current liabilities | 1,852,000 |  |  |  |  |  |  |  | 1,852,000 |  |  |
Deferred income taxes | 1,195,000 |  |  |  |  |  |  |  | 1,195,000 |  |  |
Other deferred credits | 16,119,000 |  |  |  |  |  |  |  | 16,119,000 |  |  |
Retained earnings/paid-in capital | 4,022,000 |  |  |  |  |  |  |  | 4,022,000 |  |  |
2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 308,600,000 |  |  |  |  |  |  |  | 308,600,000 |  |  |
2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 256,100,000 |  |  |  |  |  |  |  | 256,100,000 |  |  |
2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 242,400,000 |  |  |  |  |  |  |  | 242,400,000 |  |  |
2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | 192,700,000 |  |  |  |  |  |  |  | 192,700,000 |  |  |
Thereafter [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation | $ 892,000,000 |  |  |  |  |  |  |  | $ 892,000,000 |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings increase |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000

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