2.0.0.10 false CONSOLIDATED STATEMENTS OF INCOME (USD $) 001000 - Statement - CONSOLIDATED STATEMENTS OF INCOME true false In Thousands, except Per Share data false false 1 usd $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 usd $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 Income Statement 0 us-gaap_IncomeStatementAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 3 Revenues 1 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false false false false 1 true true false false 2204006000 2204006 false false false 2 true true false false 1250865000 1250865 false false false Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 4 Cost of sales and fuel 1 us-gaap_CostOfRevenue us-gaap true debit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false 1942881000 1942881 false false false 2 false true false false 997324000 997324 false false false The aggregate cost of goods produced and sold and services rendered during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 5 Net margin 1 us-gaap_GrossProfit us-gaap true credit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 261125000 261125 false false false 2 false true false false 253541000 253541 false false false Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. No authoritative reference available. true 6 Operating expenses 1 us-gaap_OperatingExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 7 Operations and maintenance 2 oks_OperationsAndMaintenance oks false debit duration monetary Expenses incurred for the administration, supervision, operation, maintenance, preservation, and protection of the entity's... false false false false false false false false false false false false 1 false true false false 87205000 87205 false false false 2 false true false false 77679000 77679 false false false Expenses incurred for the administration, supervision, operation, maintenance, preservation, and protection of the entity's business. No authoritative reference available. false 8 Depreciation and amortization 2 us-gaap_DepreciationDepletionAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false 43871000 43871 false false false 2 false true false false 39940000 39940 false false false The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. No authoritative reference available. false 9 General taxes 2 oks_GeneralTaxes oks false debit duration monetary General taxes including primarily payroll and ad valorem. false false false false false false false false false false false false 1 false true false false 9101000 9101 false false false 2 false true false false 11767000 11767 false false false General taxes including primarily payroll and ad valorem. No authoritative reference available. false 10 Total operating expenses 2 us-gaap_OperatingExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 140177000 140177 false false false 2 false true false false 129386000 129386 false false false Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No authoritative reference available. true 11 Gain (loss) on sale of assets 1 us-gaap_GainLossOnDispositionOfAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false false false terselabel false 1 false true false false -786000 -786 false false false 2 false true false false 664000 664 false false false The gains and losses included in earnings resulting from the sale or disposal of tangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 false 12 Operating income 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 120162000 120162 false false false 2 false true false false 124819000 124819 false false false The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 13 Equity earnings from investments (Note I) 1 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false 21116000 21116 false false false 2 false true false false 21222000 21222 false false false This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 14 Allowance for equity funds used during construction 1 oks_AllowanceForEquityFundsUsedDuringConstruction oks false credit duration monetary The cost of equity related to financing the construction of regulated assets. false false false false false false false false false false false label false 1 false true false false 247000 247 false false false 2 false true false false 9003000 9003 false false false The cost of equity related to financing the construction of regulated assets. No authoritative reference available. false 15 Other income 1 us-gaap_OtherNonoperatingIncome us-gaap true credit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false 1850000 1850 false false false 2 false true false false 391000 391 false false false The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 false 16 Other expense 1 us-gaap_OtherNonoperatingExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -342000 -342 false false false 2 false true false false -2046000 -2046 false false false Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 false 17 Interest expense 1 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -54153000 -54153 false false false 2 false true false false -50908000 -50908 false false false The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 18 Income before income taxes 1 oks_IncomeBeforeIncomeTaxes oks false credit duration monetary Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of... false false false false false false false false false false false totallabel false 1 false true false false 88880000 88880 false false false 2 false true false false 102481000 102481 false false false Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of changes in accounting principles and noncontrolling interest. No authoritative reference available. true 19 Income taxes 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false false true negated false 1 false true false false -4860000 -4860 false false false 2 false true false false -2871000 -2871 false false false The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 20 Net income 1 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 84020000 84020 false false false 2 false true false false 99610000 99610 false false false The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) true 21 Less: Net income attributable to noncontrolling interests 1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false 152000 152 false false false 2 false true false false 19000 19 false false false The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 false 22 Net income attributable to ONEOK Partners, L.P. 1 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 false true false false 83868000 83868 false false false 2 false true false false 99591000 99591 false false false The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 true 23 Limited partners' interest in net income: 1 us-gaap_PartnershipIncomeAbstract us-gaap true na duration string No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false No definition available. false 24 Net income attributable to ONEOK Partners, L.P. 2 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false false false label false 1 false true false false 83868000 83868 false false false 2 false true false false 99591000 99591 false false false The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 25 General partner's interest in net income 2 us-gaap_NetIncomeLossAllocatedToGeneralPartners us-gaap true credit duration monetary No definition available. false false false false false false false false false false false false 1 false true false false -27387000 -27387 false false false 2 false true false false -22312000 -22312 false false false Aggregate amount of net income allocated to general partners in a publicly trade limited partnership or master limited partnership (MLP). General partners have unlimited liability and manage the partnership. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F false 26 Limited partners' interest in net income 2 us-gaap_NetIncomeLossAllocatedToLimitedPartners us-gaap true credit duration monetary No definition available. false false false false false false false false false false false totallabel false 1 true true false false 56481000 56481 false false false 2 true true false false 77279000 77279 false false false Aggregate amount of net income allocated to general partners in a publicly trade limited partnership or master limited partnership (MLP). Limited partners have limited liability and do not manage the partnership. No authoritative reference available. true 27 Limited partners' net income per unit, basic and diluted (Note J) 1 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnit us-gaap true na duration decimal No definition available. false false false false false false false false false false false true 1 true true false false 0.57 0.57 false false false 2 true true false false 0.85 0.85 false false false Net income (loss) allocated to each outstanding limited partnership unit in a publicly traded limited partnership or master limited partnership (MLP). Limited partners have limited liability and do not manage the partnership. 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