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REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue, Initial Application Period Cumulative Effect Transition [Table Text Block] | The impact on our Consolidated Income Statement and Balance Sheet is as follows (in thousands):
|  | Year Ended December 31, 2018
Income Statement |  | As Reported |  | Balance Without Adoption of Topic 606 |  | Effect of Change Increase/(Decrease)
Commodity sales |  | $ | 11,395,642 |  |  | $ | 11,460,913 |  |  | $ | (65,271 | )
Services revenue |  | $ | 1,197,554 |  |  | $ | 2,712,256 |  |  | $ | (1,514,702 | )
Cost of sales and fuel (exclusive of depreciation and operating costs) |  | $ | 9,422,708 |  |  | $ | 11,006,278 |  |  | $ | (1,583,570 | )
Depreciation and amortization |  | $ | 428,557 |  |  | $ | 427,976 |  |  | $ | 581 |
Income taxes |  | $ | 362,903 |  |  | $ | 362,210 |  |  | $ | 693 |
Net income |  | $ | 1,155,032 |  |  | $ | 1,152,709 |  |  | $ | 2,323 |
Net income attributable to noncontrolling interests |  | $ | 3,329 |  |  | $ | 3,322 |  |  | $ | 7 |
Net income attributable to ONEOK |  | $ | 1,151,703 |  |  | $ | 1,149,387 |  |  | $ | 2,316 |
|  | December 31, 2018
Balance Sheet |  | As Reported |  | Balance Without Adoption of Topic 606 |  | Effect of Change Increase/(Decrease)
Accounts receivable, net |  | $ | 818,958 |  |  | $ | 956,523 |  |  | $ | (137,565 | )
Natural gas and natural gas liquids in storage |  | $ | 296,667 |  |  | $ | 301,555 |  |  | $ | (4,888 | )
Other current assets |  | $ | 100,808 |  |  | $ | 99,579 |  |  | $ | 1,229 |
Property, plant and equipment |  | $ | 18,030,963 |  |  | $ | 18,006,653 |  |  | $ | 24,310 |
Accumulated depreciation and amortization |  | $ | 3,264,312 |  |  | $ | 3,262,359 |  |  | $ | 1,953 |
Other assets |  | $ | 130,096 |  |  | $ | 125,606 |  |  | $ | 4,490 |
Accounts payable |  | $ | 1,118,102 |  |  | $ | 1,255,667 |  |  | $ | (137,565 | )
Other current liabilities |  | $ | 211,110 |  |  | $ | 209,258 |  |  | $ | 1,852 |
Deferred income taxes |  | $ | 219,731 |  |  | $ | 218,536 |  |  | $ | 1,195 |
Other deferred credits |  | $ | 450,627 |  |  | $ | 434,508 |  |  | $ | 16,119 |
Retained earnings/paid-in capital |  | $ | 7,615,138 |  |  | $ | 7,611,116 |  |  | $ | 4,022 |
Contract with Customer, Asset and Liability [Table Text Block] | The following tables set forth the changes in our contract asset and contract liability balances for the year ended December 31, 2018:
Contract Assets |  | (Millions of dollars)
Balance at January 1, 2018 (a) |  | $ | 6.4 |
Amounts invoiced in excess of revenue recognized |  | (0.9 | )
Net additions |  | 0.7 |
Balance at December 31, 2018 (b) |  | $ | 6.2 |
(a) - Balance includes $0.9 million of current assets. (b) - Contract assets of $1.7 million and $4.5 million are included in other current assets and other assets, respectively, in our Consolidated Balance Sheet.
Contract Liabilities |  | (Millions of dollars)
Balance at January 1, 2018 (a) |  | $ | 33.3 |
Revenue recognized included in beginning balance |  | (19.5 | )
Net additions |  | 17.9 |
Balance at December 31, 2018 (b) |  | $ | 31.7 |
(a) - Balance includes $19.5 million of current liabilities. (b) - Contract liabilities of $15.6 million and $16.1 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2018, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 25 years:
Expected Period of Recognition in Revenue |  | (Millions of dollars)
2019 |  | $ | 308.6 |
2020 |  | 256.1 |
2021 |  | 242.4 |
2022 |  | 192.7 |
2023 and beyond |  | 892.0 |
Total estimated transaction price allocated to unsatisfied performance obligations |  | $ | 1,891.8 |

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