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REVENUES (Notes) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue from Contract with Customer [Text Block] | REVENUES Adoption of ASC Topic 606: Revenue from Contracts with Customers - We adopted Topic 606 on January 1, 2018, using the modified retrospective method applied to contracts that were active as of January 1, 2018. Results for reporting periods beginning after January 1, 2018, are presented under Topic 606, while prior periods are not adjusted and continue to be reported under the accounting standards in effect for those periods. We recorded a net increase to the beginning balance of retained earnings of $1.7 million as of January 1, 2018, due to the cumulative impact of adopting the standard, primarily related to the timing of revenue on transportation contracts with tiered rates that resulted in contract assets in our Natural Gas Pipelines segment, contributions in aid of construction from customers that resulted in contract liabilities and an adjustment to NGL inventory related to contractual fees in our Natural Gas Liquids Segment, as described below. Based on the new guidance, we determined that certain Natural Gas Gathering and Processing segment POP with fee contracts and Natural Gas Liquids segment exchange services contracts that include the purchase of commodities are supplier contracts. Therefore, contractual fees in these identified contracts are now recorded as a reduction of the commodity purchase price in cost of sales and fuel pursuant to ASC 705 rather than as services revenue. To the extent we hold inventory related to these purchases, the related fees previously recorded in services revenue will not be recognized until the inventory is sold. We continue to be principal on the downstream sales of those commodities, which is unchanged from our assessment under previous guidance. 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 |
Practical Expedients - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. Receivables from Customers - The balances in accounts receivable on our Consolidated Balance Sheet at December 31, 2018, and December 31, 2017, include customer receivables of $0.8 billion and $1.2 billion, respectively. Accounting Policies - See Note A for revenue recognition accounting policies. Contract Assets and Contract Liabilities - Contract assets and contract liabilities are recorded when the amount of revenue recognized from a contract with a customer differs from the amount billed to the customer and recorded in accounts receivable. Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates. Our contract liabilities primarily represent deferred revenue on NGL storage contracts for which revenue is recognized over a one-year term and deferred revenue on contributions in aid of construction received from customers for which revenue is recognized over the contract period, which averages 10 years. 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. Transaction Price Allocated to Unsatisfied Performance Obligations - 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 |
The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. Information on the nature of the variable consideration excluded and the nature of the performance obligations to which the variable consideration relates can be found in the description of the major contract types discussed in Note A. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the transaction price is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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