ONEOK (OKE) 10-Q 5 Nov 14 2014 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 28, 2014
Document Information [Line Items]	'	'
Entity Registrant Name	'ONEOK INC /NEW/	'
Entity Central Index Key	'0001039684	'
Current Fiscal Year End Date	'--12-31	'
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	208,198,062
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues [Abstract]	'	'	'	'
Commodity sales	$2,754,495	$2,807,329	$8,276,333	$7,453,534
Services	365,650	328,052	1,073,990	968,786
Total revenues	3,120,145	3,135,381	9,350,323	8,422,320
Cost of sales and fuel	2,583,204	2,711,159	7,807,275	7,214,233
Net margin	536,941	424,222	1,543,048	1,208,087
Operating expenses	'	'	'	'
Operations and maintenance	153,408	116,678	433,457	346,989
Depreciation and amortization	74,588	61,850	214,129	176,016
General taxes	19,087	14,323	60,171	50,912
Total operating expenses	247,083	192,851	707,757	573,917
Gain (loss) on sale of assets	1,534	21	1,533	341
Operating income	291,392	231,392	836,824	634,511
Equity earnings (loss) from investments (Note K)	-52,347	27,468	6,747	79,744
Allowance for equity funds used during construction	1,723	6,429	13,947	21,172
Other income	100	4,278	3,117	12,634
Other expense	-2,506	-595	-27,827	-2,476
Interest expense (net of capitalized interest of $14,303, $14,320, $41,446 and $38,284, respectively)	-86,052	-66,187	-269,704	-196,793
Income before income taxes	152,310	202,785	563,104	548,792
Income taxes	-37,858	-44,961	-95,155	-126,688
Income from continuing operations	114,452	157,824	467,949	422,104
Income (loss) from discontinued operations, net of tax (Note B)	-171	-10,126	-6,406	-29,206
Net income	114,281	147,698	461,543	392,898
Less: Net income attributable to noncontrolling interests	49,823	85,342	241,980	217,102
Net income attributable to ONEOK	64,458	62,356	219,563	175,796
Amounts attributable to ONEOK:	'	'	'	'
Income from continuing operations	64,629	72,482	225,969	205,002
Income (loss) from discontinued operations	-171	-10,126	-6,406	-29,206
Net income attributable to ONEOK	$64,458	$62,356	$219,563	$175,796
Basic earnings per share:	'	'	'	'
Income from continuing operations (Note I)	$0.31	$0.35	$1.08	$1
Income (loss) from discontinued operations	$0	($0.05)	($0.03)	($0.15)
Net income	$0.31	$0.30	$1.05	$0.85
Diluted earnings per share:	'	'	'	'
Income from continuing operations (Note I)	$0.31	$0.35	$1.07	$0.98
Income (loss) from discontinued operations	$0	($0.05)	($0.03)	($0.14)
Net income	$0.31	$0.30	$1.04	$0.84
Average shares (thousands)	'	'	'	'
Basic	209,489	206,235	209,341	205,952
Diluted	210,759	209,893	210,482	209,408
Dividends declared per share of common stock	$0.57	$0.38	$1.53	$1.10

CONSOLIDATED_STATEMENTS_OF_INC1

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Costs, Capitalized During Period	$14,303	$14,320	$41,446	$38,284

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$114,281	$147,698	$461,543	$392,898
Other comprehensive income (loss), net of tax	'	'	'	'
Unrealized gains (losses) on energy marketing and risk-management assets/liabilities, net of tax of $(1,160), $(467), $12,664, and $(10,349), respectively	6,219	-2,542	-72,627	37,095
Realized (gains) losses in net income, net of tax of $(748), $333, $(14,966) and $(1,748), respectively	3,132	789	48,170	4,694
Unrealized holding gains (losses) on available-for-sale securities, net of tax of $(73), $277, $(36) and $147, respectively	107	-440	-6	-234
Change in pension and postretirement benefit plan liability, net of tax of $(1,456), $4,603, $(5,379) and $13,651 respectively	2,185	-7,293	8,069	-21,637
Total other comprehensive income (loss), net of tax	11,643	-9,486	-16,394	19,918
Comprehensive income	125,924	138,212	445,149	412,816
Less: Comprehensive income attributable to noncontrolling interests	55,995	83,378	214,644	239,714
Comprehensive income attributable to ONEOK	$69,929	$54,834	$230,505	$173,102

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other comprehensive income (loss), net of tax	'	'	'	'
Unrealized gains (losses) on energy marketing and risk-management assets/liabilities, tax	($1,160)	($467)	$12,664	($10,349)
Realized losses (gains) in net income, tax	-748	333	-14,966	-1,748
Unrealized holding gains (losses) on available-for-sale securities, tax	-73	277	-36	147
Change in pension and postretirement benefit plan liability, tax	($1,456)	$4,603	($5,379)	$13,651

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$151,403	$145,565
Accounts receivable, net	971,285	1,109,510
Natural gas and natural gas liquids in storage	338,345	188,286
Commodity imbalances	74,247	80,481
Other current assets	119,427	133,010
Assets of discontinued operations (Note B)	58,080	747,872
Total current assets	1,712,787	2,404,724
Property, plant and equipment	'	'
Property, plant and equipment	12,173,835	10,970,256
Accumulated depreciation and amortization	1,931,713	1,738,302
Net property, plant and equipment	10,242,122	9,231,954
Investments and other assets	'	'
Investments in unconsolidated affiliates (Note K)	1,128,509	1,229,838
Goodwill and intangible assets	1,017,715	1,024,562
Other assets	184,935	224,353
Assets of discontinued operations (Note B)	26,128	3,626,050
Total investments and other assets	2,357,287	6,104,803
Total assets	14,312,196	17,741,481
Current liabilities	'	'
Current maturities of long-term debt	10,650	10,650
Notes payable (Note E)	0	564,462
Accounts payable	1,221,934	1,273,102
Commodity imbalances	171,249	213,577
Accrued interest	102,838	109,099
Accrued taxes other than income	90,681	37,359
Other current liabilities	120,162	66,393
Liabilities of discontinued operations (Note B)	64,387	455,688
Total current liabilities	1,781,901	2,730,330
Long-term debt, excluding current maturities (Note F)	7,194,957	7,753,657
Deferred credits and other liabilities	'	'
Deferred income taxes	1,303,548	1,146,562
Other deferred credits	229,280	217,522
Liabilities of discontinued operations (Note B)	43,115	1,048,230
Total deferred credits and other liabilities	1,575,943	2,412,314
Commitments and contingencies (Note M)	'	'
ONEOK shareholders' equity:	'	'
Common stock, $0.01 par value: authorized 600,000,000 shares; issued 245,811,180 shares and outstanding 208,193,467 shares at September 30, 2014; issued 245,811,180 shares and outstanding 206,618,877 shares at December 31, 2013	2,458	2,458
Paid-in capital	1,515,158	1,433,600
Accumulated other comprehensive loss (Note H)	-107,656	-121,987
Retained earnings	170,249	2,020,815
Treasury stock, at cost: 37,617,713 shares at September 30, 2014, and 39,192,203 shares at December 31, 2013	-956,977	-997,035
Total ONEOK shareholders' equity	623,232	2,337,851
Noncontrolling interests in consolidated subsidiaries	3,136,163	2,507,329
Total equity	3,759,395	4,845,180
Total liabilities and equity	$14,312,196	$17,741,481

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS Parenthetical (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Common stock, shares, par value (in dollars per share)	$0.01	$0.01
Common stock, shares, authorized (in shares)	600,000,000	600,000,000
Common stock, shares, issued (in shares)	245,811,180	245,811,180
Common stock, shares, outstanding (in shares)	208,193,467	206,618,877
Treasury stock, shares (in shares)	37,617,713	39,192,303

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net income	$461,543	$392,898
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	225,483	276,343
Charges attributable to exit activities	1,739	130,753
Equity earnings from investments	-6,747	-79,744
Distributions received from unconsolidated affiliates	84,298	79,022
Deferred income taxes	96,044	107,575
Share-based compensation expense	23,359	27,634
Pension and postretirement benefit expense, net of contributions	14,282	7,638
Allowance for equity funds used during construction	-13,947	-21,172
Loss (gain) on sale of assets	1,533	342
Other	0	-4,047
Changes in assets and liabilities:	'	'
Accounts receivable	156,555	182,377
Natural gas and natural gas liquids in storage	-43,351	-147,199
Accounts payable	-111,186	82,743
Commodity imbalances, net	-33,214	-49,274
Settlement of exit activities liabilities	-38,627	-6,143
Accrued interest	-6,390	17,462
Accrued taxes other than income	66,083	27,417
Other assets and liabilities, net	-3,852	-2,395
Cash provided by operating activities	870,539	1,021,546
Investing Activities	'	'
Capital expenditures (less allowance for equity funds used during construction)	-1,204,386	-1,597,820
Acquisitions	-14,000	-304,889
Contributions to unconsolidated affiliates	-1,063	-4,558
Distributions received from unconsolidated affiliates	24,925	24,891
Proceeds from sale of assets	2,388	1,685
Cash used in investing activities	-1,192,136	-1,880,691
Financing Activities	'	'
Borrowing (repayment) of notes payable, net	-564,462	-254,841
Issuance of ONE Gas, Inc. debt, net of discounts	1,199,994	0
Issuance of long-term debt, net of discounts	0	1,247,822
Payments Of Financing Costs Discontinued Operations	9,663	0
Long-term debt financing costs	0	-10,217
Repayment of long-term debt	-555,768	-5,802
Issuance of common stock	12,908	8,538
Issuance of common units, net of issuance costs	947,472	569,246
Dividends paid	-321,051	-226,349
Cash of ONE Gas, Inc. at separation	-60,000	0
Distributions to noncontrolling interests	-325,158	-273,346
Cash provided by financing activities	324,272	1,055,051
Change in cash and cash equivalents	2,675	195,906
Change in cash and cash equivalents included in discontinued operations	3,163	1,358
Change in cash and cash equivalents included in continuing operations	5,838	197,264
Cash and cash equivalents at beginning of period	145,565	579,578
Cash and cash equivalents at end of period	$151,403	$776,842

CONSOLIDATED_STATEMENT_OF_CHAN

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests in Consolidated Subsidiaries [Member]
In Thousands, except Share data
Stockholders' equity, beginning balance at Dec. 31, 2012	$4,232,450	'	'	'	'	'	$2,102,841
Net income	392,898	'	'	'	'	'	217,102
Other comprehensive income (loss)	19,918	'	'	'	'	'	22,612
Common stock issued	11,892	'	'	'	'	'	0
Common stock dividends - $1.535 per share	-226,349	'	'	'	'	'	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	516,201	'	'	'	'	'	431,743
Distribution of ONE Gas to shareholders (Note B)	0	'	'	'	'	'	0
Distributions to noncontrolling interests	-273,346	'	'	'	'	'	-273,346
Other	16,982	'	'	'	'	'	0
Stockholders' equity, ending balance at Sep. 30, 2013	4,690,646	'	'	'	'	'	2,500,952
Stockholders' equity, beginning balance at Jun. 30, 2013	4,174,356	'	'	'	'	'	2,089,007
Net income	147,698	'	'	'	'	'	85,342
Other comprehensive income (loss)	-9,486	'	'	'	'	'	-1,964
Common stock issued	4,142	'	'	'	'	'	0
Common stock dividends - $1.535 per share	-78,367	'	'	'	'	'	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	501,893	'	'	'	'	'	420,391
Distribution of ONE Gas to shareholders (Note B)	0	'	'	'	'	'	0
Distributions to noncontrolling interests	-91,824	'	'	'	'	'	-91,824
Other	42,234	'	'	'	'	'	0
Stockholders' equity, ending balance at Sep. 30, 2013	4,690,646	'	'	'	'	'	2,500,952
Stockholders' equity, beginning balance at Dec. 31, 2013	4,845,180	2,458	1,433,600	-121,987	2,020,815	-997,035	2,507,329
Common stock issued, beginning balance (in shares) at Dec. 31, 2013	'	245,811,180	'	'	'	'	'
Net income	461,543	0	0	0	219,563	0	241,980
Other comprehensive income (loss)	-16,394	0	0	10,942	0	0	-27,336
Common stock issued	19,661	0	-20,397	0	0	40,058	0
Common stock issued (in shares)	'	0	'	'	'	'	'
Common stock dividends - $1.535 per share	-321,051	0	0	0	-321,051	0	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	877,658	0	138,310	0	0	0	739,348
Distribution of ONE Gas to shareholders (Note B)	-1,745,689	0	0	3,389	-1,749,078	0	0
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Amount Transferred to Separated Entity, Net of Tax	3,389	'	'	'	'	'	'
Distributions to noncontrolling interests	-325,158	0	0	0	0	0	-325,158
Other	-36,355	0	-36,355	0	0	0	0
Stockholders' equity, ending balance at Sep. 30, 2014	3,759,395	2,458	1,515,158	-107,656	170,249	-956,977	3,136,163
Common stock issued, ending balance (in shares) at Sep. 30, 2014	'	245,811,180	'	'	'	'	'
Stockholders' equity, beginning balance at Jun. 30, 2014	3,793,331	'	'	'	'	'	3,136,906
Net income	114,281	'	'	'	'	'	49,823
Other comprehensive income (loss)	11,643	'	'	'	'	'	6,172
Common stock issued	5,757	'	'	'	'	'	0
Common stock dividends - $1.535 per share	-121,367	'	'	'	'	'	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	73,263	'	'	'	'	'	62,078
Distribution of ONE Gas to shareholders (Note B)	1,735	'	'	'	'	'	0
Distributions to noncontrolling interests	-118,816	'	'	'	'	'	-118,816
Other	-432	'	'	'	'	'	0
Stockholders' equity, ending balance at Sep. 30, 2014	$3,759,395	'	'	'	'	'	$3,136,163

CONSOLIDATED_STATEMENT_OF_CHAN1

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY Parenthetical (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'	'	'	'	'
Common Stock, Dividends, Per Share, Cash Paid	$0.57	$0.56	$0.40	$0.38	$1.53	$1.10

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	A.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Our accompanying unaudited consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. These statements have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair presentation of the results for the interim periods presented.  All such adjustments are of a normal recurring nature. The 2013 year-end consolidated balance sheet data was derived from our audited financial statements but does not include all disclosures required by GAAP.  These unaudited consolidated financial statements should be read in conjunction with our audited consolidated financial statements in our Annual Report.
	Our significant accounting policies are consistent with those disclosed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.
	Organization and Nature of Operations - We are the sole general partner and own limited partner units of ONEOK Partners (NYSE: OKS), which together represent an aggregate 38.3 percent interest in ONEOK Partners at September 30, 2014. On January 31, 2014, we completed the separation of our natural gas distribution business into a stand-alone publicly traded company called ONE Gas (NYSE: OGS). On March 31, 2014, we completed the accelerated wind down of our energy services business. The results of operations for our former natural gas distribution and energy services businesses have been classified as discontinued operations for all periods presented. Following the ONE Gas separation and wind down of our energy services business, our primary source of income and cash flow is generated from our investment in ONEOK Partners. See Note B for additional information.
	Unless indicated otherwise, the information in the Notes to the Consolidated Financial Statements relates to our continuing operations.
	Change in Reportable Segments - Following the separation of our natural gas distribution business into ONE Gas and wind down of our energy services business, our chief operating decision maker reviews the financial performance of each of the three businesses of ONEOK Partners on a regular basis to assess the performance of, and allocate resources to, ONEOK Partners. As a result, our reportable segments have changed effective for the first quarter 2014 to reflect the three business segments of ONEOK Partners, which include the following:
	•	the Natural Gas Gathering and Processing segment, which gathers, treats and processes natural gas;
	•	the Natural Gas Liquids segment, which gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and
	•	the Natural Gas Pipelines segment, which operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities.
	We have reflected the change in reporting segments for all periods presented. See Note N for additional information.
	Income Taxes - Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse. Deferred tax liabilities and deferred income tax expense were reduced by $34.6 million in the first quarter 2014 due to a reduction in our estimate of the effective state income tax rate to reflect a change in the mix of taxable income in the states in which we now operate, resulting from the separation of our former natural gas distribution business and the wind down of our energy services business. We also recorded a valuation allowance of $8.2 million in the first quarter 2014 for state tax credits as it is more likely than not that we will not be able to utilize these credits as a result of the separation of our former natural gas distribution business and the wind down of our energy services business. Together, these adjustments resulted in a net $26.4 million reduction in deferred tax liabilities and deferred income tax expense.
	Recently Issued Accounting Standards Update - In April 2014, the FASB issued ASU 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,” which alters the definition of a discontinued operation to include only asset disposals that represent a strategic shift with a major effect on an entity's operations and financial results.  The amendments also require more extensive disclosures about a discontinued operation’s assets, liabilities, income, expenses and cash flows. This guidance will be effective for interim and annual periods for all assets that are disposed of or classified as being held for sale in fiscal years that begin on or after December 15, 2014. We will adopt this guidance beginning in the first quarter 2015, and it could impact us in the future if we dispose of any individually significant components.
	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which outlines the principles an entity must apply to measure and recognize revenue for entities that enter into contracts to provide goods or services to their customers. The core principle is that an entity should recognize revenue at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. The amendments also require more extensive disaggregated revenue disclosures in interim and annual financial statements. This update will be effective for interim and annual periods that begin on or after December 15, 2016, with either retrospective application for all periods presented or retrospective application with a cumulative effect adjustment. We will adopt this guidance beginning in the first quarter 2017, and we are evaluating the impact on us.
	In August 2014, the FASB issued ASU 2014-15, “Going Concern,” which provides guidance on determining when and how to disclose going-concern uncertainties in the financial statements. The new standard requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. An entity must provide certain disclosures if conditions or events raise substantial doubt about the entity’s ability to continue as a going concern. The standard applies to all entities and is effective for annual periods ending after December 15, 2016, and interim periods thereafter, with early adoption permitted. We will adopt this guidance beginning in the first quarter 2017, and we do not expect it to materially impact us.

DISCONTINUED_OPERATIONS

DISCONTINUED OPERATIONS	9 Months Ended
	Sep. 30, 2014
Discontinued Operations [Abstract]	'
DISCONTINUED OPERATIONS	'
	B.	DISCONTINUED OPERATIONS
	Separation of ONE Gas - On January 31, 2014, we completed the separation of ONE Gas. ONE Gas consists of ONEOK’s former natural gas distribution business that includes Kansas Gas Service, Oklahoma Natural Gas and Texas Gas Service. ONEOK shareholders of record at the close of business on January 21, 2014, retained their shares of ONEOK stock and received one share of ONE Gas stock for every four shares of ONEOK stock owned in a transaction that was tax-free to ONEOK and its shareholders. ONE Gas shares were distributed following the close of business on January 31, 2014. We retained no ownership interest in ONE Gas. On the date of the separation, ONE Gas consisted of approximately $4.3 billion of assets, $2.6 billion of liabilities and $1.7 billion of equity. Excluding cash of ONE Gas at separation, the separation was accounted for as a noncash activity. These balances include certain estimates expected to be finalized in 2014.
	Wind Down of Energy Services Business - On March 31, 2014, we completed the accelerated wind down of our former energy services business. We executed an agreement in the first quarter 2014 to release a nonaffiliated, third-party natural gas storage contract to a third party, resulting in a noncash charge of $1.7 million. All of the remaining natural gas transportation and storage contracts not previously released or assigned expired on their own terms on or before March 31, 2014. Our energy services business continued to serve its contracted premium-services customers until these remaining contracts expired on or before March 31, 2014. Our energy services business was classified as discontinued operations, effective at the close of business March 31, 2014, when substantially all operations ceased.
	The following table summarizes the change in our liability related to released capacity contracts for the period indicated:
		Nine Months Ended
		September 30, 2014
		(Millions of dollars)
	Beginning balance	$	122
	Noncash charges	1.7
	Settlements	(38.6		)
	Accretion	1.5
	Ending balance	$	86.6
	We expect future cash payments associated with previously released transportation and storage capacity from the wind down of our energy services business on an after-tax basis to be approximately $53 million, with approximately $8 million to be paid in the remainder of 2014, $23 million in 2015, $11 million in 2016 and $11 million over the period 2017 through 2023.
	Results of Operations of Discontinued Operations - The results of operations for our former natural gas distribution and energy services businesses have been reported as discontinued operations for all periods presented. The tables below provide selected financial information reported in discontinued operations in the Consolidated Statements of Income:
			Three Months Ended										Nine Months Ended
			30-Sep-14										September 30, 2014
			Natural Gas			Energy				Total			Natural Gas				Energy			Total
			Distribution			Services							Distribution				Services
			(Thousands of dollars)
	Revenues		$	—		$	—			$	—		$	287,249			$	353,404		$	640,653
	Cost of sales and fuel		—			—				—			190,893				364,648			555,541
	Net margin		—			—				—			96,356				(11,244		)	85,112
	Operating costs		—			142			(b)	142			60,847			(a)	4,664			65,511
	Depreciation and amortization		—			—				—			11,035				319			11,354
	Operating income (loss)		—			(142		)		(142		)	24,474				(16,227		)	8,247
	Other income (expense), net		—			—				—			(888		)		(7		)	(895		)
	Interest expense, net		—			—				—			(4,592		)		(413		)	(5,005		)
	Income taxes		—			(29		)		(29		)	(16,415		)		7,662			(8,753		)
	Income (loss) from discontinued operations, net		$	—		$	(171	)		$	(171	)	$	2,579			$	(8,985	)	$	(6,406	)
	(a) - Includes approximately $23.0 million for the nine months ended September 30, 2014, of costs related to the ONE Gas separation.
	(b) - Represents primarily accretion expense.
			Three Months Ended										Nine Months Ended
			30-Sep-13										30-Sep-13
			Natural Gas			Energy				Total			Natural Gas				Energy			Total
			Distribution			Services							Distribution				Services
			(Thousands of dollars)
	Revenues		$	219,723		$	298,145			$	517,868		$	1,167,260			$	1,128,324		$	2,295,584
	Cost of sales and fuel		60,492			320,411				380,903			577,912				1,287,731			1,865,643
	Net margin		159,231			(22,266		)		136,965			589,348				(159,407		)	429,941
	Operating costs		103,682			2,178				105,860			321,467				10,545			332,012
	Depreciation and amortization		32,347			70				32,417			100,118				209			100,327
	Operating income (loss)		23,202			(24,514		)		(1,312		)	167,763				(170,161		)	(2,398		)
	Other income (expense), net		1,354			41				1,395			1,929				86			2,015
	Interest expense, net		(15,233		)	(488		)		(15,721		)	(45,702		)		(1,581		)	(47,283		)
	Income taxes		(3,571		)	9,083				5,512			(44,372		)		62,832			18,460
	Income (loss) from discontinued operations, net		$	5,752		$	(15,878	)		$	(10,126	)	$	79,618			$	(108,824	)	$	(29,206	)
	Prior to the ONE Gas separation, natural gas sales and transportation and storage services provided to our former natural gas distribution business by ONEOK Partners were $17.7 million for the three months ended September 30, 2013, and $7.5 million and $45.8 million for the nine months ended September 30, 2014 and 2013, respectively. Prior to February 1, 2014, these revenues and related costs were eliminated in consolidation. Beginning February 1, 2014, these revenues represent third-party transactions with ONE Gas and are not eliminated in consolidation, as such sales and services have continued subsequent to the separation and are expected to continue in future periods.
	Prior to the completion of the energy services wind down, natural gas sales and transportation and storage services provided to our energy services business by ONEOK Partners were $63.6 million for the three months ended September 30, 2013, and $46.0 million and $209.5 million for the nine months ended September 30, 2014 and 2013, respectively. While these transactions were eliminated in consolidation in previous periods, they are reflected now as affiliate transactions and not eliminated in consolidation as these transactions have continued with third parties.
	Statement of Financial Position of Discontinued Operations - The following table presents the carrying value of assets and liabilities of our former natural gas distribution and energy services businesses included in assets and liabilities of discontinued operations in the Consolidated Balance Sheets for the period presented:
			31-Dec-13
			Natural Gas			Energy				Total
			Distribution			Services
			(Thousands of dollars)
	Assets
	Cash and cash equivalents		$	3,535		$	213			$	3,748
	Accounts receivable, net		368,214			87,315				455,529
	Natural gas and natural gas liquids in storage		166,128			62,663				228,791
	Other current assets		30,328			29,476				59,804
	Net property, plant and equipment		3,065,272			279				3,065,551
	Goodwill		157,953			—				157,953
	Other assets		402,161			385				402,546
	Total assets		$	4,193,591		$	180,331			$	4,373,922
	Liabilities
Current maturities of long-term debt		$	6		$	—			$	6
Accounts payable		168,785			77,287				246,072
Other current liabilities		168,964			40,646				209,610
Long-term debt, excluding current maturities		1,318			—				1,318
Deferred income taxes		826,921			(35,221		)		791,700
Other deferred credits		184,214			70,998				255,212
Total liabilities		$	1,350,208		$	153,710			$	1,503,918
At September 30, 2014, the major classes of assets and liabilities in discontinued operations related to our former energy services business. These amounts consisted of current assets, which included income taxes receivable of $43.8 million and deferred tax assets of $12.4 million; noncurrent assets, which included deferred tax assets of $25.7 million; current liabilities, which included capacity release obligations of $43.5 million and deferred tax liabilities of $11.7 million; and noncurrent liabilities, which included $43.1 million of noncurrent capacity release obligations.

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENTS	'
	C.	FAIR VALUE MEASUREMENTS
	Determining Fair Value - We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  We measure the fair value of groups of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.
	In the first quarter 2014, outstanding commodity derivative positions with third parties entered into by our energy services business on ONEOK Partners’ behalf were transferred to ONEOK Partners. Beginning in the second quarter 2014, ONEOK Partners enters into all commodity derivative financial contracts directly with unaffiliated third parties.
	While many of the contracts in ONEOK Partners’ portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  For certain transactions, ONEOK Partners utilizes modeling techniques using NYMEX-settled pricing data and implied forward LIBOR curves. Inputs into ONEOK Partners’ fair value estimates include commodity-exchange prices, over-the-counter quotes, historical correlations of pricing data and LIBOR and other liquid money-market instrument rates.  ONEOK Partners also utilizes internally developed basis curves that incorporate observable and unobservable market data.  ONEOK Partners validates its valuation inputs with third-party information and settlement prices from other sources, where available.
	In addition, as prescribed by the income approach, ONEOK Partners computes the fair value of its derivative portfolio by discounting the projected future cash flows from its derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  ONEOK Partners also takes into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions.  It considers current market data in evaluating counterparties’, as well as its own, nonperformance risk, net of collateral, by using specific and sector bond yields and monitoring the credit default swap markets.  Although ONEOK Partners uses its best estimates to determine the fair value of the derivative contracts it has executed, the ultimate market prices realized could differ from its estimates, and the differences could be material.
	The fair value of ONEOK Partners’ forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.
	Fair Value Hierarchy - At each balance sheet date, we and ONEOK Partners utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in the financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:
	•	Level 1 - fair value measurements are based on unadjusted quoted prices in active markets, including NYMEX-settled prices and actively quoted prices for equity securities. These balances are comprised predominantly of exchange-traded derivative contracts for natural gas and crude oil. Also included in Level 1 are equity securities.
	•	Level 2 - fair value measurements are based on significant observable pricing inputs, such as NYMEX-settled prices for natural gas and crude oil, and financial models that utilize implied forward LIBOR yield curves for interest-rate swaps.
	•	Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed basis curves that incorporate observable and unobservable market data, NGL price curves from broker quotes, market volatilities derived from the most recent NYMEX close spot prices and forward LIBOR curves, and adjustments for the credit risk of ONEOK Partners’ counterparties.  ONEOK Partners corroborates the data on which its fair value estimates are based using its market knowledge of recent transactions, analysis of historical correlations and validation with independent broker quotes.  These balances categorized as Level 3 are comprised of derivatives for natural gas and NGLs.  ONEOK Partners does not believe that its Level 3 fair value estimates have a material impact on its results of operations, as the majority of its derivatives are accounted for as hedges for which ineffectiveness is not material.
	Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for our continuing operations for the periods indicated:
		September 30, 2014
		Level 1			Level 2			Level 3			Total - Gross			Netting (a)			Total - Net (b)
		(Thousands of dollars)
	Assets
	Derivatives
	Commodity contracts
	Financial contracts	$	9,093		$	439		$	—		$	9,532		$	(3,004	)	$	6,528
	Physical contracts	—			—			2,900			2,900			(329		)	2,571
	Interest-rate contracts	—			20,962			—			20,962			—			20,962
	Total derivatives	9,093			21,401			2,900			33,394			(3,333		)	30,061
	Available-for-sale investment securities (c)	1,599			—			—			1,599			—			1,599
	Total assets	$	10,692		$	21,401		$	2,900		$	34,993		$	(3,333	)	$	31,660
	Liabilities
	Derivatives
	Commodity contracts
	Financial contracts	$	(83	)	$	—		$	(2,921	)	$	(3,004	)	$	3,004		$	—
	Physical contracts	—			—			(683		)	(683		)	329			(354		)
	Interest-rate contracts	—			(23,308		)	—			(23,308		)	—			(23,308		)
	Total liabilities	$	(83	)	$	(23,308	)	$	(3,604	)	$	(26,995	)	$	3,333		$	(23,662	)
	(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis.  ONEOK Partners nets derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and ONEOK Partners.  At September 30, 2014, we and ONEOK Partners had no cash collateral held or posted.
	(b) - Included in other current assets, other assets or other current liabilities in our Consolidated Balance Sheets.
	(c) - Available-for-sale investment securities represent assets of ONEOK.
		December 31, 2013
		Level 1			Level 2			Level 3			Total - Gross			Netting (a)			Total - Net (b)
		(Thousands of dollars)
	Assets
	Derivatives
	Commodity contracts
	Financial contracts	$	—		$	3,657		$	2,812		$	6,469		$	(1,746	)	$	4,723
	Physical contracts	—			—			2,023			2,023			(946		)	1,077
	Interest-rate contracts	—			54,503			—			54,503			—			54,503
	Total derivatives	—			58,160			4,835			62,995			(2,692		)	60,303
	Available-for-sale investment securities (c)	1,569			—			—			1,569			—			1,569
	Total assets	$	1,569		$	58,160		$	4,835		$	64,564		$	(2,692	)	$	61,872
	Liabilities
	Derivatives
	Commodity contracts
	Financial contracts	$	—		$	(2,953	)	$	(2,154	)	$	(5,107	)	$	1,746		$	(3,361	)
	Physical contracts	—			—			(3,463		)	(3,463		)	946			(2,517		)
	Total derivative liabilities	$	—		$	(2,953	)	$	(5,617	)	$	(8,570	)	$	2,692		$	(5,878	)
	(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis.  ONEOK Partners nets derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and ONEOK Partners. At December 31, 2013, we and ONEOK Partners had no cash collateral held or posted.
	(b) - Included in other current assets, other assets or other current liabilities in our Consolidated Balance Sheets.
	(c) - Available-for-sale investment securities represent assets of ONEOK.
	The following table sets forth the reconciliation of our Level 3 fair value measurements for our continuing operations for the periods indicated:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
	Derivative Assets (Liabilities)	2014			2013			2014			2013
		(Thousands of dollars)
	Net assets (liabilities) at beginning of period	$	(1,313	)	$	7,682		$	(782	)	$	(2,423	)
	Total realized/unrealized gains (losses):
	Included in earnings (a)	207			—			(688		)	—
	Included in other comprehensive income (loss)	402			(7,181		)	(2,968		)	2,924
Purchases, issuances and settlements	—			—			3,734			—
Net assets (liabilities) at end of period	$	(704	)	$	501		$	(704	)	$	501
(a) - Reported in commodity sales revenues in our Consolidated Statements of Income.
Realized/unrealized gains (losses) include the realization of ONEOK Partners’ derivative contracts through maturity. During the three and nine months ended September 30, 2014 and 2013, gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the end of the period were not material.
ONEOK Partners recognizes transfers into and out of the levels in the fair value hierarchy as of the end of each reporting period.  During the three and nine months ended September 30, 2014 and 2013, there were no transfers between levels.
Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and notes payable is equal to book value, due to the short-term nature of these items. Our cash and cash equivalents are comprised of bank and money market accounts and are classified as Level 1.  Our notes payable are classified as Level 2 since the estimated fair value of the notes payable can be determined using information available in the commercial paper market.
The estimated fair value of our consolidated long-term debt, including current maturities, was $7.9 billion and $8.2 billion at September 30, 2014, and December 31, 2013, respectively.  The book value of long-term debt, including current maturities, was $7.2 billion and $7.8 billion at September 30, 2014, and December 31, 2013, respectively.  The estimated fair value of the aggregate of ONEOK’s and ONEOK Partners’ senior notes outstanding was determined using quoted market prices for similar issues with similar terms and maturities.  The estimated fair value of our consolidated long-term debt is classified as Level 2.
During the three months ended September 30, 2014, ONEOK Partners recorded a noncash impairment to its equity investment in Bighorn Gas Gathering. The valuation of this investment required use of significant unobservable inputs. ONEOK Partners used an income approach to estimate the fair value of its investment. ONEOK Partners’ discounted cash flow analysis included the following inputs that are not readily available: a discount rate reflective of its cost of capital and estimated contract rates, volumes, operating and maintenance costs and capital expenditures. The estimated fair value of this investment is classified as Level 3. See Note K for additional information about ONEOK Partners’ investment in Bighorn Gas Gathering and the impairment charge.

RISK_MANAGEMENT_AND_HEDGING_AC

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES	'
	D.	RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES
	Risk-Management Activities - ONEOK Partners is sensitive to changes in natural gas, crude oil and NGL prices, principally as a result of contractual terms under which these commodities are processed, purchased and sold.  ONEOK Partners uses physical-forward sales and financial derivatives to secure a certain price for a portion of its natural gas, condensate and NGL products.  ONEOK Partners follows established policies and procedures to assess risk and approve, monitor and report its risk-management activities.  ONEOK Partners has not used these instruments for trading purposes.  We and ONEOK Partners are also subject to the risk of interest-rate fluctuation in the normal course of business.
	Commodity-price risk - ONEOK Partners is exposed to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs, crude oil and condensate.  ONEOK Partners uses the following commodity derivatives instruments to mitigate the commodity-price risk associated with a portion of the forecasted sales of these commodities:
	•	Futures contracts - Standardized contracts to purchase or sell natural gas and crude oil for future delivery or settlement under the provisions of exchange regulations;
	•	Forward contracts - Nonstandardized commitments between two parties to purchase or sell natural gas, crude oil or NGLs for future physical delivery. These contracts typically are nontransferable and only can be canceled with the consent of both parties; and
	•	Swaps - Exchange of one or more payments based on the value of one or more commodities. These instruments transfer the financial risk associated with a future change in value between the counterparties of the transaction, without also conveying ownership interest in the asset or liability.
	The Natural Gas Gathering and Processing segment is exposed to commodity-price risk as a result of receiving commodities in exchange for services associated with its POP contracts. ONEOK Partners is also exposed to basis risk between the various production and market locations where it receives and sells commodities.  As part of its hedging strategy, ONEOK Partners uses the previously described commodity derivative financial instruments and physical-forward contracts to minimize the impact of price fluctuations related to natural gas, NGLs and condensate.
	The Natural Gas Liquids segment is exposed to basis risk primarily as a result of the relative value of NGL purchases at one location and sales at another location. To a lesser extent, ONEOK Partners is exposed to commodity-price risk resulting from the relative values of the various NGL products to each other, NGLs in storage and the relative value of NGLs to natural gas. ONEOK Partners utilizes physical-forward contracts to reduce the impact of price fluctuations related to NGLs. At September 30, 2014, and December 31, 2013, there were no financial derivative instruments used in ONEOK Partners’ natural gas liquids operations.
	The Natural Gas Pipelines segment is exposed to commodity-price risk because its intrastate and interstate natural gas pipelines retain natural gas from its customers for operations or as part of its fee for services provided. When the amount of natural gas consumed as fuel in operations by these pipelines differs from the amount provided by its customers, ONEOK Partners’ pipelines must buy or sell natural gas, or store or use natural gas from inventory, which can expose it to commodity-price risk depending on the regulatory treatment for this activity. To the extent that commodity-price risk in the Natural Gas Pipelines segment is not mitigated by fuel cost-recovery mechanisms, ONEOK Partners uses physical-forward sales or purchases to reduce the impact of price fluctuations related to natural gas. At September 30, 2014, and December 31, 2013, there were no financial derivative instruments used in ONEOK Partners’ natural gas pipeline operations.
	Interest-rate risk - We and ONEOK Partners manage interest-rate risk through the use of fixed-rate debt, floating-rate debt and interest-rate swaps. Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts. At September 30, 2014, ONEOK Partners had forward-starting interest-rate swaps with notional amounts totaling $900 million that have been designated as cash flow hedges of the variability of interest payments on a portion of forecasted debt issuances that may result from changes in the benchmark interest rate before the debt is issued, of which $400 million have settlement dates greater than 12 months.
	Accounting Treatment - We and ONEOK Partners record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.
	The table below summarizes the various ways in which we and ONEOK Partners account for derivative instruments and the impact on our consolidated financial statements:
			Recognition and Measurement
	Accounting Treatment		Balance Sheet		Income Statement
	Normal purchases and normal	-	Fair value not recorded	-	Change in fair value not recognized in earnings
	sales
	Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
	Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the
					derivative instrument is recognized in earnings
		-	Effective portion of the gain or loss on the	-	Effective portion of the gain or loss on the
			derivative instrument is reported initially		derivative instrument is reclassified out of
			as a component of accumulated other		accumulated other comprehensive income (loss)
			comprehensive income (loss)		into earnings when the forecasted transaction
					affects earnings
	Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is
					recognized in earnings
		-	Change in fair value of the hedged item is	-	Change in fair value of the hedged item is
			recorded as an adjustment to book value		recognized in earnings
	Under certain conditions, we and ONEOK Partners designate derivative instruments as a hedge of exposure to changes in fair values or cash flows. We and ONEOK Partners formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness. We and ONEOK Partners specifically identify the forecasted transaction that has been designated as the hedged item in a cash flow hedge relationship. We and ONEOK Partners assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on fair value and cash flow hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis.  ONEOK Partners also documents normal purchases and normal sales transactions expected to result in physical delivery and that are exempted from derivative accounting treatment.
	The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are reported on a gross basis.
	Cash flows from futures, forwards and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.
	Fair Values of Derivative Instruments - See Note C for a discussion of the inputs associated with our fair value measurements. The following table sets forth the fair values of derivative instruments for our continuing operations for the periods indicated:
		September 30, 2014								December 31, 2013
		Assets (a)				(Liabilities) (a)				Assets (a)				(Liabilities) (a)
		(Thousands of dollars)
	Derivatives designated as hedging instruments
	Commodity contracts
	Financial contracts	$	9,532			$	(3,004	)		$	6,469			$	(5,107	)
	Physical contracts	2,554				(608		)		1,064				(3,463		)
	Interest-rate contracts	20,962				(23,308		)		54,503				—
	Total derivatives designated as hedging instruments	33,048				(26,920		)		62,036				(8,570		)
	Derivatives not designated as hedging instruments
	Commodity contracts
	Physical contracts	346				(75		)		959				—
	Total derivatives not designated as hedging instruments	346				(75		)		959				—
	Total derivatives	$	33,394			$	(26,995	)		$	62,995			$	(8,570	)
	(a) - Included on a net basis in other current assets, other assets or other current liabilities on our Consolidated Balance Sheets.
	Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments for our continuing operations for the periods indicated:
			September 30, 2014								December 31, 2013
		Contract	Purchased/				Sold/				Purchased/				Sold/
		Type	Payor				Receiver				Payor				Receiver
	Derivatives designated as hedging instruments:
	Cash flow hedges
	Fixed price
	- Natural gas (Bcf)	Futures and swaps	—				(31.2		)		—				(48.1		)
	- Crude oil and NGLs (MMbbl)	Futures, forwards	—				(1.7		)		—				(4.0		)
		and swaps
	Basis
	- Natural gas (Bcf)	Futures and swaps	—				(31.2		)		—				(48.1		)
	Interest-rate contracts (Millions of dollars)	Forward-starting	$	900			$	—			$	400			$	—
		swaps
	These notional quantities are used to summarize the volume of financial instruments; however, they do not reflect the extent to which the positions offset one another and consequently do not reflect ONEOK Partners’ actual exposure to market or credit risk.
	Cash Flow Hedges - Accumulated other comprehensive income (loss) at September 30, 2014, includes gains of approximately $1.5 million, net of tax, related to ONEOK Partners’ commodity derivative instruments that will be recognized within the next 15 months as the forecasted transactions affect earnings.  If prices remain at current levels, we will recognize $1.3 million in net gains over the next 12 months and net gains of $0.2 million thereafter.  The amount deferred in accumulated other comprehensive income (loss) attributable to our and ONEOK Partners’ settled interest-rate swaps is a loss of $38.6 million, net of tax, which will be recognized over the life of the long-term, fixed-rate debt. We expect that losses of $4.8 million will be reclassified into earnings during the next 12 months as the hedged items affect earnings. The remaining amounts in accumulated other comprehensive income (loss) are attributable primarily to ONEOK Partners’ forward-starting interest-rate swaps with future settlement dates, which will be amortized to interest expense over the life of long-term, fixed-rate debt upon issuance of ONEOK Partners’ debt.
The following table sets forth the effects of cash flow hedges recognized in other comprehensive income (loss) for our continuing operations for the periods indicated:
Derivatives in Cash Flow	Three Months Ended								Nine Months Ended
Hedging Relationships	September 30,								September 30,
	2014				2013				2014				2013
	(Thousands of dollars)
Commodity contracts	$	17,133			$	(10,317	)		$	(24,743	)		$	3,060
Interest-rate contracts	(9,755		)		6,721				(56,849		)		35,726
Total unrealized gain (loss) recognized in other comprehensive	$	7,378			$	(3,596	)		$	(81,592	)		$	38,786
income (loss) on derivatives(effective portion)
The following table sets forth the effect of cash flow hedges on our Consolidated Statements of Income for our continuing operations for the periods indicated:
Derivatives in Cash Flow	Location of Gain (Loss) Reclassified from	Three Months Ended								Nine Months Ended
Hedging Relationships	Accumulated Other Comprehensive Income	September 30,								September 30,
	(Loss) into Net Income (Effective Portion)	2014				2013				2014				2013
		(Thousands of dollars)
Commodity contracts	Commodity sales revenues	$	(355	)		$	361			$	(31,961	)		$	4,172
Interest-rate contracts	Interest expense	(3,525		)		(3,696		)		(18,372		)		(10,840		)
Total gain (loss) reclassified from accumulated other comprehensive		$	(3,880	)		$	(3,335	)		$	(50,333	)		$	(6,668	)
income (loss) into net income on derivatives (effective portion)
Ineffectiveness related to our and ONEOK Partners’ cash flow hedges was not material for the three and nine months ended September 30, 2014 and 2013.  In the event that it becomes probable that a forecasted transaction will not occur, ONEOK Partners will discontinue cash flow hedge treatment, which will affect earnings.
For the nine months ended September 30, 2014, we reclassified losses of $4.6 million, net of taxes of $3.1 million, to interest expense from accumulated other comprehensive income (loss) due to the discontinuance of cash flow hedge treatment from the de-designation of interest-rate swaps related to the early retirement of long-term debt. See Note F for additional information. There were no gains or losses due to the discontinuance of cash flow hedge treatment during the three months ended September 30, 2014, and the three and nine months ended September 30, 2013.
Credit Risk - In the first quarter 2014, outstanding commodity derivative positions with third parties entered into by our energy services business on ONEOK Partners’ behalf were transferred to ONEOK Partners. Beginning in the second quarter 2014, ONEOK Partners enters into all commodity derivative financial contracts directly with unaffiliated third parties.
We and ONEOK Partners monitor the creditworthiness of counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We and ONEOK Partners maintain credit policies on counterparties that we and ONEOK Partners believe minimize overall credit risk.  These policies include an evaluation of potential counterparties’ financial condition (including credit ratings, bond yields and credit default swap rates), collateral requirements under certain circumstances and the use of standardized master-netting agreements that allow us to net the positive and negative exposures associated with a single counterparty.  ONEOK Partners has counterparties whose credit is not rated, and for those customers it uses internally developed credit ratings.
Some of ONEOK Partners’ financial derivative instruments contain provisions that require it to maintain an investment-grade credit rating from S&P and/or Moody’s.  If ONEOK Partners’ credit ratings on senior unsecured long-term debt were to decline below investment grade, the counterparties to the derivative instruments could request collateralization on derivative instruments in net liability positions. There were no financial derivative instruments with contingent features related to credit risk in a net liability position at September 30, 2014.
The counterparties to ONEOK Partners’ derivative contracts consist primarily of major energy companies, financial institutions and commercial and industrial end users.  This concentration of counterparties may affect ONEOK Partners’ overall exposure to credit risk, either positively or negatively, in that the counterparties may be affected similarly by changes in economic, regulatory or other conditions.  Based on ONEOK Partners’ policies, exposures, credit and other reserves, it does not anticipate a material adverse effect on its financial position or results of operations as a result of counterparty nonperformance.

CREDIT_FACILITIES_AND_SHORTTER

CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE	9 Months Ended
	Sep. 30, 2014
Short-term Debt [Abstract]	'
CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE	'
	E.	CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE
	ONEOK Credit Agreement - The ONEOK Credit Agreement, which was amended and restated effective on January 31, 2014, and expires in January 2019, is a $300 million revolving credit facility and contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining a ratio of indebtedness to Consolidated EBITDA (EBITDA, as defined in our ONEOK Credit Agreement) of no more than 4.0 to 1. Upon breach of certain covenants by us in the ONEOK Credit Agreement, amounts outstanding under the ONEOK Credit Agreement, if any, may become due and payable immediately. At September 30, 2014, ONEOK’s ratio of indebtedness to Consolidated EBITDA was 1.9 to 1, and ONEOK was in compliance with all covenants under the ONEOK Credit Agreement. As a result of a reduction in the borrowing capacity of the ONEOK Credit Agreement, we wrote off approximately $2.9 million in interest expense of previously deferred credit agreement issuance costs in the first quarter 2014.
	The ONEOK Credit Agreement also includes a $50 million sublimit for the issuance of standby letters of credit and a $50 million sublimit for swingline loans. Under the terms of the ONEOK Credit Agreement, ONEOK may request an increase in the size of the facility to an aggregate of $500 million from $300 million by either commitments from new lenders or increased commitments from existing lenders. The ONEOK Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating. Based on our current credit rating, borrowings, if any, will accrue at LIBOR plus 125 basis points, and the annual facility fee is 25 basis points.
	In February 2014, we repaid all amounts outstanding under our commercial paper program, with a portion of the proceeds received from ONE Gas in connection with the separation, and terminated the program. See Note F for additional information. At September 30, 2014, ONEOK had $2.1 million in letters of credit issued and no borrowings under the ONEOK Credit Agreement.
	ONEOK Partners Credit Agreement - The amount of short-term borrowings authorized by ONEOK Partners GP’s Board of Directors is $2.5 billion. At September 30, 2014, ONEOK Partners had no commercial paper outstanding, $14.0 million in letters of credit issued and no borrowings under the ONEOK Partners Credit Agreement.
	The ONEOK Partners Credit Agreement, which was amended and restated effective on January 31, 2014, and expires in January 2019, is a $1.7 billion revolving credit facility and includes a $100 million sublimit for the issuance of standby letters of credit, a $150 million swingline sublimit and an option to request an increase in the size of the facility to an aggregate of $2.4 billion by either commitments from new lenders or increased commitments from existing lenders. The ONEOK Partners Credit Agreement is available for general partnership purposes. During the second quarter 2014, ONEOK Partners increased the size of its commercial paper program to $1.7 billion from $1.2 billion. Amounts outstanding under ONEOK Partners’ commercial paper program reduce the borrowing capacity under the ONEOK Partners Credit Agreement.
	The ONEOK Partners Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in its credit rating. Under the terms of the ONEOK Partners Credit Agreement, based on ONEOK Partners’ current credit ratings, borrowings, if any, will accrue at LIBOR plus 117.5 basis points, and the annual facility fee is 20 basis points. The ONEOK Partners Credit Agreement is guaranteed fully and unconditionally by the Intermediate Partnership.
	The ONEOK Partners Credit Agreement contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in the ONEOK Partners Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1.  If ONEOK Partners consummates one or more acquisitions in which the aggregate purchase price is $25 million or more, the allowable ratio of indebtedness to adjusted EBITDA will increase to 5.5 to 1 for the quarter in which the acquisition was completed and the two following quarters.  As a result of a pipeline acquisition ONEOK Partners completed in the first quarter 2014, the allowable ratio of indebtedness to adjusted EBITDA increased to 5.5 to 1 through the third quarter 2014. Upon breach of certain covenants by ONEOK Partners in the ONEOK Partners Credit Agreement, amounts outstanding under the ONEOK Partners Credit Agreement, if any, may become due and payable immediately.  At September 30, 2014, its ratio of indebtedness to adjusted EBITDA was 3.4 to 1, and ONEOK Partners was in compliance with all covenants under the ONEOK Partners Credit Agreement.
	Neither ONEOK nor ONEOK Partners guarantees the debt or other similar commitments of unaffiliated parties. ONEOK does not guarantee the debt, commercial paper or other similar commitments of ONEOK Partners, and ONEOK Partners does not guarantee the debt or other similar commitments of ONEOK.

LONGTERM_DEBT

LONG-TERM DEBT	9 Months Ended
	Sep. 30, 2014
Long-term Debt, Unclassified [Abstract]	'
LONG-TERM DEBT	'
	F.	LONG-TERM DEBT
	In January 2014, ONE Gas, which at the time was our wholly owned subsidiary, completed a private placement of three series of Senior Notes totaling $1.2 billion. The following table details information about each of the three series of Senior Notes:
			(In millions)
	2.07% notes due February 1, 2019		$	300
	3.61% notes due February 1, 2024		300
	4.658% notes due February 1, 2044		600
	Total		$	1,200
	Our obligations related to the ONE Gas Senior Notes terminated when we completed the separation of ONE Gas on January 31, 2014.
	ONE Gas made a cash payment to us of approximately $1.13 billion from the proceeds of this offering. In February 2014, we retired approximately $152.5 million of the 4.25 percent senior notes due in 2022 through a tender offer. The total amount paid was approximately $150 million. In February 2014, we called our $400 million, 5.2 percent senior notes due in 2015. The full repayment occurred in March 2014 and totaled $430.1 million, including accrued but unpaid interest to the redemption date. We recorded a loss on extinguishment of $24.8 million related to the debt retirements, which is included in other expense in our Consolidated Statements of Income.
	In September 2013, ONEOK Partners completed an underwritten public offering of $1.25 billion of senior notes, consisting of $425 million, 3.2 percent senior notes due 2018, $425 million, 5.0 percent senior notes due 2023 and $400 million, 6.2 percent senior notes due 2043. A portion of the net proceeds from the offering of approximately $1.24 billion was used to repay amounts outstanding under its commercial paper program, and the balance was used for general partnership purposes, including but not limited to capital expenditures.

EQUITY

EQUITY	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	G.	EQUITY
	The following table sets forth the changes in equity attributable to us and our noncontrolling interests, including other comprehensive income, net of tax, for the periods indicated:
		Three Months Ended									Three Months Ended
		30-Sep-14									30-Sep-13
		ONEOK			Noncontrolling			Total			ONEOK			Noncontrolling			Total
		Shareholders’			Interests in			Equity			Shareholders’			Interests in			Equity
		Equity			Consolidated						Equity			Consolidated
					Subsidiaries									Subsidiaries
		(Thousands of dollars)
	Beginning balance	$	656,425		$	3,136,906		$	3,793,331		$	2,085,349		$	2,089,007		$	4,174,356
	Net income	64,458			49,823			114,281			62,356			85,342			147,698
	Other comprehensive income	5,471			6,172			11,643			(7,522		)	(1,964		)	(9,486		)
	(loss)
	Common stock issued	5,757			—			5,757			4,142			—			4,142
	Common stock dividends	(121,367		)	—			(121,367		)	(78,367		)	—			(78,367		)
	Issuance of common units of	11,185			62,078			73,263			81,502			420,391			501,893
	ONEOK Partners
	Distribution of ONE Gas to shareholders	1,735			—			1,735			—			—			—
	Distributions to noncontrolling	—			(118,816		)	(118,816		)	—			(91,824		)	(91,824		)
	interests
	Other	(432		)	—			(432		)	42,234			—			42,234
	Ending balance	$	623,232		$	3,136,163		$	3,759,395		$	2,189,694		$	2,500,952		$	4,690,646
		Nine Months Ended									Nine Months Ended
		30-Sep-14									30-Sep-13
		ONEOK			Noncontrolling			Total			ONEOK			Noncontrolling			Total
		Shareholders’			Interests in			Equity			Shareholders’			Interests in			Equity
		Equity			Consolidated						Equity			Consolidated
					Subsidiaries									Subsidiaries
		(Thousands of dollars)
	Beginning balance	$	2,337,851		$	2,507,329		$	4,845,180		$	2,129,609		$	2,102,841		$	4,232,450
	Net income	219,563			241,980			461,543			175,796			217,102			392,898
	Other comprehensive income	10,942			(27,336		)	(16,394		)	(2,694		)	22,612			19,918
	(loss)
	Common stock issued	19,661			—			19,661			11,892			—			11,892
	Common stock dividends	(321,051		)	—			(321,051		)	(226,349		)	—			(226,349		)
	Issuance of common units of	138,310			739,348			877,658			84,458			431,743			516,201
	ONEOK Partners
	Distribution of ONE Gas to shareholders	(1,745,689		)	—			(1,745,689		)	—			—			—
	Distributions to noncontrolling	—			(325,158		)	(325,158		)	—			(273,346		)	(273,346		)
	interests
	Other	(36,355		)	—			(36,355		)	16,982			—			16,982
	Ending balance	$	623,232		$	3,136,163		$	3,759,395		$	2,189,694		$	2,500,952		$	4,690,646
	Dividends - Dividends paid on our common stock to shareholders of record at the close of business on February 10, 2014, April 30, 2014, and August 14, 2014, were $0.40 per share, $0.56 per share and $0.575 per share, respectively.  A dividend of $0.59 per share was declared for shareholders of record at the close of business on November 3, 2014, payable November 14, 2014.
	See Note L for a discussion of ONEOK Partners’ issuance of common units and distributions to noncontrolling interests.

ACCUMULATED_OTHER_COMPREHENSIV

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	'
	H.	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	The following table sets forth the balance in accumulated other comprehensive income (loss) for the period indicated:
		Unrealized Gains				Unrealized				Pension and				Accumulated
		(Losses) on Energy				Holding Gains				Postretirement				Other
		Marketing and				(Losses)				Benefit Plan				Comprehensive
		Risk-Management				on Investment				Obligations (a)				Income (Loss) (a)
		Assets/Liabilities (a)				Securities (a)
		(Thousands of dollars)
	1-Jan-14	$	(43,168	)		$	857			$	(79,676	)		$	(121,987	)
	Other comprehensive income (loss) before	(20,717		)		(6		)		(79		)		(20,802		)
	reclassifications
	Amounts reclassified from accumulated other	23,596				—				8,148				31,744
	comprehensive income (loss)
	Other comprehensive income	2,879				(6		)		8,069				10,942
	(loss) attributable to ONEOK
	Transfer to ONE Gas	—				—				3,389				3,389
	September 30, 2014	$	(40,289	)		$	851			$	(68,218	)		$	(107,656	)
	(a) All amounts are presented net of tax.
	The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) on our Consolidated Statements of Income for the periods indicated:
	Details about Accumulated Other		Three Months Ended								Nine Months Ended							Affected Line Item in
	Comprehensive Income (Loss)		September 30,								September 30,							the Consolidated
	Components		2014				2013				2014				2013			Statements of Income
			(Thousands of dollars)
	Unrealized (gains) losses on energy marketing and risk-management assets/liabilities
	Commodity contracts		$	355			$	(361	)		$	31,961			$	(4,172	)	Commodity sales revenues
	Interest-rate contracts		3,525				3,696				18,372				10,840			Interest expense
			3,880				3,335				50,333				6,668			Income before income taxes
			(748		)		(781		)		(9,845		)		(1,836		)	Income tax expense
			3,132				2,554				40,488				4,832			Income from continuing operations
			—				(1,765		)		7,682				(138		)	Income (loss) from discontinued operations
			3,132				789				48,170				4,694			Net income
	Noncontrolling interest		1,928				1,317				24,574				1,923			Less: Net income attributable to noncontrolling interest
			$	1,204			$	(528	)		$	23,596			$	2,771		Net income (loss) attributable to ONEOK
	Pension and postretirement benefit plan obligations (a)
	Amortization of net loss		$	4,009			$	5,078			$	11,936			$	15,234
	Amortization of unrecognized prior service cost		(368		)		(113		)		(1,102		)		(339		)
	Amortization of unrecognized net asset at adoption		—				7				—				21
			3,641				4,972				10,834				14,916			Income before income taxes
			(1,456		)		(1,924		)		(4,334		)		(5,770		)	Income tax expense
			2,185				3,048				6,500				9,146			Income from continuing operations
			—				8,379				1,648				25,381			Income from discontinued operations
			$	2,185			$	11,427			$	8,148			$	34,527		Net income attributable to ONEOK
	Total reclassifications for the period attributable to ONEOK		$	3,389			$	10,899			$	31,744			$	37,298		Net income attributable to ONEOK
	(a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note J for additional detail of our net periodic benefit cost.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	I.	EARNINGS PER SHARE
	The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:
		Three Months Ended September 30, 2014
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	64,629	209,489	$	0.31
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		1,270
	Income from continuing operations attributable to ONEOK available for common	$	64,629	210,759	$	0.31
	stock and common stock equivalents
		Three Months Ended September 30, 2013
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	72,482	206,235	$	0.35
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		3,658
	Income from continuing operations attributable to ONEOK available for common	$	72,482	209,893	$	0.35
	stock and common stock equivalents
		Nine Months Ended September 30, 2014
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	225,969	209,341	$	1.08
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		1,141
	Income from continuing operations attributable to ONEOK available for common	$	225,969	210,482	$	1.07
	stock and common stock equivalents
		Nine Months Ended September 30, 2013
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	205,002	205,952	$	1
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		3,456
	Income from continuing operations attributable to ONEOK available for common	$	205,002	209,408	$	0.98
	stock and common stock equivalents

EMPLOYEE_BENEFIT_PLANS

EMPLOYEE BENEFIT PLANS	9 Months Ended
	Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
EMPLOYEE BENEFIT PLANS	'
	J.	EMPLOYEE BENEFIT PLANS
	The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for our continuing operations for the periods indicated:
		Pension Benefits						Pension Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(Thousands of dollars)
	Components of net periodic benefit cost
	Service cost	$	1,784		$	1,532		$	5,429		$	4,596
	Interest cost	4,488			3,906			13,744			11,718
	Expected return on assets	(4,775		)	(4,969		)	(14,644		)	(14,907		)
	Amortization of unrecognized prior service cost	48			58			144			174
	Amortization of net loss	3,798			4,755			11,309			14,265
	Other	16			—			136			—
	Net periodic benefit cost	$	5,359		$	5,282		$	16,118		$	15,846
		Postretirement Benefits						Postretirement Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(Thousands of dollars)
	Components of net periodic benefit cost
	Service cost	$	175		$	118		$	533		$	354
	Interest cost	603			298			1,825			894
	Expected return on assets	(513		)	(314		)	(1,623		)	(942		)
	Amortization of unrecognized net asset at adoption	—			7			—			21
	Amortization of unrecognized prior service cost	(416		)	(171		)	(1,246		)	(513		)
	Amortization of net loss	211			323			627			969
	Other	—			—			(2		)	—
	Net periodic benefit cost	$	60		$	261		$	114		$	783

UNCONSOLIDATED_AFFILIATES

UNCONSOLIDATED AFFILIATES	9 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
UNCONSOLIDATED AFFILIATES	'
	K.	UNCONSOLIDATED AFFILIATES
	Equity Earnings from Investments - The following table sets forth ONEOK Partners’ equity earnings (losses) from investments for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014			2013
		(Thousands of dollars)
	Share of investee earnings (loss)
	Northern Border Pipeline	$	14,371		$	16,464	$	53,657		$	48,133
	Overland Pass Pipeline Company	3,856			5,783		12,708			14,210
	Fort Union Gas Gathering	4,169			2,946		12,578			9,895
	Bighorn Gas Gathering (a)	(23,472		)	559		(24,745		)	1,897
	Other	2,150			1,716		5,970			5,609
	Total share of investee earnings	1,074			27,468		60,168			79,744
	Impairment of investment in Bighorn Gas Gathering	(53,421		)	—		(53,421		)	—
	Equity earnings (loss) from investments	$	(52,347	)	$	27,468	$	6,747		$	79,744
	(a) Includes proportionate share of investee impairment of long-lived assets charge of $23.0 million.
	Unconsolidated Affiliates Financial Information - The following table sets forth summarized combined financial information of ONEOK Partners’ unconsolidated affiliates for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014			2013
		(Thousands of dollars)
	Income Statement
	Operating revenues	$	126,218		$	131,959	$	403,006		$	391,912
	Operating expenses (a)	$	123,620		$	63,971	$	247,169		$	189,366
	Net income (loss) (a)	$	(5,119	)	$	61,630	$	134,432		$	185,580
	Distributions paid to ONEOK Partners	$	31,574		$	34,409	$	109,223		$	103,913
	(a) - Includes long-lived asset impairment charge on Bighorn Gas Gathering.
	ONEOK Partners incurred expenses in transactions with unconsolidated affiliates of $15.0 million and $15.9 million for the three months ended September 30, 2014 and 2013, respectively, and $43.5 million and $36.3 million for the nine months ended September 30, 2014 and 2013, respectively, primarily related to Overland Pass Pipeline Company and Northern Border Pipeline Company, which are included in cost of sales and fuel in our Consolidated Statements of Income. Accounts payable to ONEOK Partners’ equity method investees at September 30, 2014, and December 31, 2013, were not material.
	Low natural gas prices and the relatively higher crude oil and NGL prices, compared with natural gas on a heating-value basis, have caused producers primarily to focus development efforts on crude oil and NGL-rich supply basins rather than areas with dry natural gas production, such as the coal-bed methane areas in the Powder River Basin.  The reduced coal-bed methane development activities and natural production declines in the dry natural gas formations of the Powder River Basin have resulted in lower natural gas volumes available to be gathered.  While the reserve potential in the dry natural gas formations of the Powder River Basin still exists, future drilling and development will be affected by commodity prices and producers’ alternative prospects.
	During 2014 through the third quarter, the volumes gathered on the Bighorn Gas Gathering system declined at a rate greater than in prior periods and greater than expected. Due to these additional declines in volumes, Bighorn Gas Gathering recorded an impairment of its underlying assets in September 2014, when the operator determined that the volume decline was other than temporary. As a result of these developments, ONEOK Partners reviewed its equity method investment in Bighorn Gas Gathering for impairment as of September 30, 2014. ONEOK Partners recorded noncash impairment charges of $76.4 million related to Bighorn Gas Gathering. The noncash impairment charges are included in equity earnings (loss) from investments in our accompanying Consolidated Statements of Income. The remaining net book value of ONEOK Partners’ equity method investment in Bighorn Gas Gathering is $8.8 million, and no equity method goodwill remains.

ONEOK_PARTNERS

ONEOK PARTNERS	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
ONEOK PARTNERS	'
	L.	ONEOK PARTNERS
	Equity Issuances - In May 2014, ONEOK Partners completed an underwritten public offering of approximately 13.9 million common units at a public offering price of $52.94 per common unit, generating net proceeds of approximately $714.5 million. In conjunction with this issuance, we contributed approximately $15.0 million in order to maintain our 2 percent general partner interest in ONEOK Partners. ONEOK Partners used the proceeds to repay commercial paper, fund capital expenditures and for general partnership purposes.
	ONEOK Partners has an “at-the-market” equity program for the offer and sale from time to time of its common units. The program allows ONEOK Partners to offer and sell its common units at prices ONEOK Partners deems appropriate through a sales agent. Sales of common units are made by means of ordinary brokers’ transactions on the NYSE, in block transactions, or as otherwise agreed to between ONEOK Partners and the sales agent. ONEOK Partners is under no obligation to offer and sell common units under the program.
	During the three months ended September 30, 2014, ONEOK Partners sold approximately 1.4 million common units through the “at-the-market” equity program. The net proceeds, including ONEOK Partners GP’s contribution to maintain its 2 percent general partner interest in ONEOK Partners, were approximately $81.3 million, which were used for general partnership purposes.
	During the nine months ended September 30, 2014, ONEOK Partners sold approximately 4.4 million common units through this program. The net proceeds, including ONEOK Partners GP’s contribution to maintain our 2 percent general partner interest in ONEOK Partners, were approximately $245.4 million, which were used for general partnership purposes.
	As a result of these transactions, our aggregate ownership interest in ONEOK Partners decreased to 38.3 percent at September 30, 2014, from 41.2 percent at December 31, 2013.
	In August 2013, ONEOK Partners completed an underwritten public offering of 11.5 million common units at a public offering price of $49.61 per common unit, generating net proceeds of approximately $553.4 million. In conjunction with this issuance, we contributed approximately $11.6 million in order to maintain our 2 percent general partner interest in ONEOK Partners. ONEOK Partners used a portion of the proceeds from its August 2013 equity issuance to repay amounts outstanding under its commercial paper program, and the balance was used for general partnership purposes.
	During the three months ended March 31, 2013, ONEOK Partners sold 300,000 common units through the “at-the-market” program that resulted in net proceeds, including ONEOK Partners GP’s contribution to maintain our 2 percent general partner interest in ONEOK Partners, of approximately $16.3 million and used the proceeds for general partnership purposes. There were no common units sold through this program in the second or third quarter 2013.
	We account for the difference between the carrying amount of our investment in ONEOK Partners and the underlying book value arising from issuance of common units by ONEOK Partners as an equity transaction.  If ONEOK Partners issues common units at a price different than our carrying value per unit, we account for the premium or deficiency as an adjustment to paid-in capital. As a result of ONEOK Partners’ issuance of common units, we recognized an increase to paid-in capital of approximately $138.3 million, net of taxes, for the nine months ended September 30, 2014.
	Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below at September 30, 2014:
	General partner interest	2	%
	Limited partner interest (a)	36.3	%
	Total ownership interest	38.3	%
	(a) - Represents 19.8 million common units and approximately 73.0 million Class B units, which are convertible, at our option, into common units.
	Cash Distributions - We receive distributions from ONEOK Partners on the common and Class B units we own and the 2 percent general partner interest, which includes our incentive distribution rights.  Under the Partnership Agreement, distributions are made to the partners with respect to each calendar quarter in an amount equal to 100 percent of available cash as defined in the Partnership Agreement.  Available cash generally will be distributed 98 percent to limited partners and 2 percent to the general partner.  The general partner’s percentage interest in quarterly distributions is increased after certain specified target levels are met during the quarter.  Under the incentive distribution provisions, as set forth in the Partnership Agreement, the general partner receives:
	•	15 percent of amounts distributed in excess of $0.3025 per unit;
	•	25 percent of amounts distributed in excess of $0.3575 per unit; and
	•	50 percent of amounts distributed in excess of $0.4675 per unit.
	In October 2014, a cash distribution of $0.775 per unit ($3.10 per unit on an annualized basis), an increase of 1.5 cents from the previous quarter, was declared for the third quarter 2014 and will be paid on November 14, 2014, to unitholders of record at the close of business on November 3, 2014.
	The following table shows ONEOK Partners’ distributions paid in the periods indicated:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands, except per unit amounts)
	Distribution per unit	$	0.76	$	0.72	$	2.235	$	2.145
	General partner distributions	$	5,501	$	4,512	$	15,361	$	13,399
	Incentive distributions	80,381		62,634		220,547		184,647
	Distributions to general partner	85,882		67,146		235,908		198,046
	Limited partner distributions to ONEOK	70,519		66,807		207,381		199,031
	Limited partner distributions to noncontrolling interest	118,644		91,676		324,805		272,904
	Total distributions paid	$	275,045	$	225,629	$	768,094	$	669,981
	The following table shows ONEOK Partners’ distributions declared for the periods indicated and paid within 45 days of the end of the period:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands, except per unit amounts)
	Distribution per unit	$	0.775	$	0.725	$	2.28	$	2.16
	General partner distributions	$	5,683	$	4,795	$	16,195	$	13,776
	Incentive distributions	84,452		67,017		236,744		191,226
	Distributions to general partner	90,135		71,812		252,939		205,002
	Limited partner distributions to ONEOK	71,911		67,271		211,557		200,422
	Limited partner distributions to noncontrolling interest	122,105		100,650		345,255		283,365
	Total distributions declared	$	284,151	$	239,733	$	809,751	$	688,789
	West Texas LPG Acquisition - In October 2014, ONEOK Partners announced that it has agreed to acquire an 80 percent interest in the West Texas LPG Limited Partnership (West Texas LPG) and 100 percent interest in the Mesquite Pipeline (Mesquite) from affiliates of Chevron Corporation for approximately $800 million, subject to customary post-closing adjustments. Closing is subject to customary conditions, including antitrust clearance from the Federal Trade Commission under the Hart-Scott-Rodino Act. Following the closing of the transaction, ONEOK Partners will be the operator of both pipelines. Financing to close this transaction is expected to come from ONEOK Partners’ available cash on hand or borrowing under its existing $1.7 billion commercial paper program or its existing $1.7 billion credit facility. We expect to account for this transaction using the acquisition method of accounting, which requires, among other things, that the asset acquired and liabilities assumed, which could include intangible assets and goodwill, be recognized on the balance sheet at their fair values as of the acquisition date.
	The West Texas LPG and Mesquite systems consist of approximately 2,600 miles of NGL gathering pipelines extending from the Permian Basin in southeastern New Mexico to East Texas and Mont Belvieu, Texas. The West Texas LPG and Mesquite systems are expected to provide ONEOK Partners additional fee-based earnings and its NGL infrastructure with access to a new NGL supply basin. The pipelines are expected to initially add an additional 230,000 bpd of unfractionated NGLs to ONEOK Partners’ expanding NGL systems. The West Texas LPG and Mesquite pipelines access NGL supply from producers actively developing the Delaware, Midland and Central Basins in the Permian Basin, in addition to the Barnett Shale, East Texas and north Louisiana regions.
	Sage Creek Acquisition - On September 30, 2013, ONEOK Partners completed the Sage Creek acquisition for $305 million of certain natural gas gathering and processing, and natural gas liquids facilities in Converse and Campbell counties, Wyoming, in the NGL-rich Niobrara Shale formation of the Powder River Basin. The Sage Creek acquisition consists primarily of a 50 MMcf/d natural gas processing facility, the Sage Creek plant, and related natural gas gathering and natural gas liquids infrastructure. Included in the acquisition were supply contracts providing for long-term acreage dedications from producers in the area, which are structured with POP and fee-based contractual terms.
	ONEOK Partners accounted for this acquisition as a business combination, which, among other things, requires assets acquired and liabilities assumed to be measured at their acquisition-date fair values. ONEOK Partners allocated $152 million to the Natural Gas Gathering and Processing segment, and allocated $153 million to the Natural Gas Liquids Segment. The excess of the purchase price over the fair values of the identifiable assets acquired of $92 million was recorded as goodwill.
	Revenues and earnings related to the Sage Creek acquisition are included within the Consolidated Statement of Income since the acquisition dates. Supplemental pro forma revenue and earnings reflecting this acquisition as if it had occurred as of January 1, 2013, are not materially different from the information presented in the accompanying Consolidated Statement of Income and are, therefore, not presented.
	Relationship - We consolidate ONEOK Partners in our consolidated financial statements; however, we are restricted from the assets and cash flows of ONEOK Partners except for the distributions we receive.  Distributions are declared quarterly by ONEOK Partners’ general partner based on the terms of the Partnership Agreement.  See Note N for more information on ONEOK Partners’ results.
	Affiliate Transactions - We have certain transactions with ONEOK Partners and its subsidiaries.
	Prior to the wind down of our energy services business, ONEOK Partners sold natural gas from its natural gas gathering and processing operations to our energy services business.  In addition, a portion of ONEOK Partners’ revenues from its natural gas pipelines business were from our former energy services and natural gas distribution businesses, which contracted with ONEOK Partners for natural gas transportation and storage services. ONEOK Partners also purchased natural gas from our former energy services business for its natural gas liquids and its natural gas gathering and processing operations.
	As a result of the wind down discussed in Note B, our energy services business no longer executes affiliate transactions with ONEOK Partners. Beginning in the second quarter, ONEOK Partners enters into all commodity derivative financial contracts with unaffiliated third parties. ONEOK Partners continues to provide natural gas transportation and storage services to ONE Gas after the separation.
	We provide a variety of services to our affiliates, including cash management and financial services, employee benefits, legal and administrative services by our employees and management, insurance and office space leased in our headquarters building and other field locations.  Where costs are incurred specifically on behalf of an affiliate, the costs are billed directly to the affiliate by us.  In other situations, the costs may be allocated to the affiliates through a variety of methods, depending upon the nature of the expenses and the activities of the affiliates.  Beginning in the second quarter 2014, we allocate substantially all of our general overhead costs to ONEOK Partners as a result of the separation of our natural gas distribution business and the wind down of our energy services business in the first quarter 2014.  For the first quarter 2014 and the three and nine months ended September 30, 2013, it is not practicable to determine what these general overhead costs would have been on a stand-alone basis.
	The following table shows ONEOK Partners’ transactions with us for the periods indicated:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands of dollars)
	Revenues	$	—	$	81,324	$	53,526	$	255,298
	Expenses
	Cost of sales and fuel	$	—	$	9,562	$	10,835	$	27,855
	Administrative and general expenses	84,221		58,549		240,172		192,906
	Total expenses	$	84,221	$	68,111	$	251,007	$	220,761
Prior to the ONE Gas separation, ONEOK Partners provided natural gas sales and transportation and storage services to our former natural gas distribution business. Prior to February 1, 2014, these revenues and related costs were eliminated in consolidation. Beginning February 1, 2014, these revenues represent third-party transactions with ONE Gas and are not eliminated in consolidation, as such sales and services have continued subsequent to the separation and are expected to continue in future periods. Prior to the completion of the energy services wind down, ONEOK Partners provided natural gas and natural gas liquids sales and transportation and storage services to our energy services business. While these transactions were eliminated in consolidation in previous periods, they are now reflected as affiliate transactions and not eliminated in consolidation as these transactions have continued with third parties. See Note B for additional detail on these revenues.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	M.	COMMITMENTS AND CONTINGENCIES
	Environmental Matters - ONEOK Partners is subject to multiple historical preservation, wildlife preservation and environmental laws and/or regulations that affect many aspects of its present and future operations.  Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetland preservation, hazardous materials transportation and pipeline and facility construction. These laws and regulations require ONEOK Partners to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals.  Failure to comply with these laws, regulations, licenses and permits may expose ONEOK Partners to fines, penalties and/or interruptions in its operations that could be material to its results of operations. For example, if a leak or spill of hazardous substances or petroleum products occurs from pipelines or facilities that ONEOK Partners owns, operates or otherwise uses, ONEOK Partners could be held jointly and severally liable for all resulting liabilities, including response, investigation and cleanup costs, which could affect materially its results of operations and cash flows.  In addition, emissions controls and/or other regulatory or permitting mandates under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures at its facilities.  ONEOK Partners cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to it.
	In June 2013, the Executive Office of the President of the United States (the President) issued the President’s Climate Action Plan, which includes, among other things, plans for further regulatory actions to reduce carbon emissions from various sources. On March 28, 2014, the President released the Climate Action Plan - Strategy to Reduce Methane Emissions (Methane Strategy) that lists a number of actions that the federal agencies will undertake to continue to reduce above-ground methane emissions from several industries, including the oil and natural gas sectors. The proposed measures outlined in the Methane Strategy include, without limitation, the following: collaboration with the states to encourage emission reductions; standards to minimize natural gas venting and flaring on public lands; policy recommendations for reducing emissions from energy infrastructure to increase the performance of the nation’s energy transmission, storage and distribution systems; and continued efforts by PHMSA to require pipeline operators to take steps to eliminate leaks and prevent accidental methane releases and evaluate the progress of states in replacing cast-iron pipelines. The impact of any such proposed regulatory actions on ONEOK Partners’ facilities and operations is unknown. ONEOK Partners continues to monitor these developments and the impact they may have on its business. Revised or additional statutes or regulations that result in increased compliance costs or additional operating restrictions could have a significant impact on its business, financial position, results of operations and cash flows.
	The legal responsibility for the environmental conditions at former manufactured natural gas sites in Kansas was transferred from us to ONE Gas on January 31, 2014, upon the completion of the separation. Our expenditures for environmental assessment, mitigation, remediation and compliance prior to the separation were not significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters have had no material effects on earnings or cash flows during the three and nine months ended September 30, 2014 and 2013.
	The EPA’s “Tailoring Rule” regulates greenhouse gas emissions at new or modified facilities that meet certain criteria. Affected facilities are required to review best available control technology (BACT), conduct air-quality and impact analysis and public reviews with respect to such emissions.  At current emissions threshold levels, this rule has had a minimal impact on ONEOK Partners’ existing facilities.  In addition, on June 23, 2014, the Supreme Court of the United States, in a case styled, Utility Air Regulatory Group v. EPA, 530 U.S. (2014), held that an industrial facility’s potential to emit greenhouse gas (GHG) emissions alone cannot subject a facility to the permitting requirements for major stationary source provisions of the Clean Air Act. The decision invalidated the EPA’s current Triggering and Tailoring Rule for GHG Prevention of Significant Deterioration (PSD) and Title V requirements as applied to facilities considered major sources only for GHGs. However, the Court also ruled that to the extent a source pursues a capital project (new construction or expansion of existing facility), which otherwise subjects the source to major source PSD permitting for conventional criteria pollutants, the permitting authorities may impose BACT analysis and emission limits for GHGs from those sources. We are in the process of evaluating the effects the decision and related pending judicial proceedings at the lower court level may have on ONEOK Partners’ existing operations and the opportunities it creates for design decisions for new project applications.
	In July 2011, the EPA issued a proposed rule that would change the air emissions New Source Performance Standards, also known as NSPS, and Maximum Achievable Control Technology requirements applicable to the oil and natural gas industry, including natural gas production, processing, transmission and underground storage sectors. In April 2012, the EPA released the final rule, which includes new NSPS and air toxic standards for a variety of sources within natural gas processing plants, oil and natural gas production facilities and natural gas transmission stations. The rule also regulates emissions from the hydraulic fracturing of wells for the first time. The EPA’s final rule reflects significant changes from the proposal issued in 2011 and allows for more manageable compliance options. The NSPS final rule became effective in October 2012, but the dates for compliance vary and depend in part upon the type of affected facility and the date of construction, reconstruction or modification.
	The rule was most recently amended in September 2013, and a further proposed rule-making was published in July 2014. The EPA has indicated that further amendments may be issued in 2014. Based on the amendments, ONEOK Partners’ understanding of pending stakeholder responses to the NSPS rule and the proposed rule-making, ONEOK Partners does not anticipate a material impact to its anticipated capital, operations and maintenance costs resulting from compliance with the regulation. However, the EPA may issue additional responses, amendments and/or policy guidance on the final rule, which could alter its present expectations. Generally, the NSPS rule will require expenditures for updated emissions controls, monitoring and record-keeping at affected facilities in the crude oil and natural gas industry. ONEOK Partners does not expect these expenditures will have a material impact on its results of operations, financial position or cash flows.
	Pipeline Safety - ONEOK Partners is subject to PHMSA regulations, including asset integrity-management regulations.  The Pipeline Safety Improvement Act of 2002 requires pipeline companies operating high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas. In January 2012, The Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011 was signed into law.  The law increased maximum penalties for violating federal pipeline safety regulations and directs the DOT and Secretary of Transportation to conduct further review or studies on issues that may or may not be material to ONEOK Partners. These issues include but are not limited to the following:
	•	an evaluation on whether hazardous natural gas liquids and natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;
	•	a review of all natural gas and hazardous natural gas liquids gathering pipeline exemptions;
	•	a verification of records for pipelines in Class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and
	•	a requirement to test previously untested pipelines operating above 30 percent yield strength in high-consequence areas.
	The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.
	Legal Proceedings - Gas Index Pricing Litigation - As previously reported, ONEOK and its subsidiary, ONEOK Energy Services Company L.P. (OESC), along with several other energy companies, are defending multiple lawsuits arising from alleged market manipulation or false reporting of natural gas prices to natural gas-index publications. On April 10, 2013, the United States Court of Appeals for the Ninth Circuit reversed the summary judgments that had been granted in favor of ONEOK, OESC and other unaffiliated defendants in the following cases: Reorganized FLI, Learjet, Arandell, Heartland and NewPage. The Ninth Circuit also reversed the summary judgment that had been granted in favor of OESC on all state law claims asserted in the Sinclair case. ONEOK, OESC and the other unaffiliated defendants filed a Petition for Writ of Certiorari with the United States Supreme Court on August 26, 2013, seeking review of the Ninth Circuit decision. On July 1, 2014, the United States Supreme Court granted the the Petition for Writ of Certiorari. We expect a decision by mid 2015.
	Because of the uncertainty surrounding the Gas Index Pricing Litigation, including an insufficient description of the purported classes and other related matters, we cannot reasonably estimate a range of potential exposures at this time. However, it is reasonably possible that the ultimate resolution of these matters could result in future charges that may be material to our results of operations.
	Other Legal Proceedings - We are a party to various other litigation matters and claims that have arisen in the normal course of our operations. While the results of these various other litigation matters and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such matters will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.
	ONE Gas Separation - In connection with the separation of ONE Gas, we entered into a Separation and Distribution Agreement with ONE Gas, which sets forth the agreements between us regarding the principal transactions necessary to effect the separation, including cross-indemnities between us and ONE Gas. In general, we agreed to indemnify ONE Gas for any liabilities relating to our business following the separation, including ONEOK Partners and our energy services business, and ONE Gas agreed to indemnify us for liabilities relating to the natural gas distribution business. If a liability does not relate to either our remaining business or to ONE Gas, then we and ONE Gas will each be responsible for a portion of such liability.
	In addition, we entered into a Transition Services Agreement with ONE Gas. Under this agreement, ONEOK and ONE Gas agreed to provide each other with various services, including services relating to treasury and risk management, accounting, human resources and payroll management, tax compliance, telecommunications services and information technology services.

SEGMENTS

SEGMENTS	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
SEGMENTS	'
	N.	SEGMENTS
	Segment Descriptions - Our reportable business segments are based upon the segments of ONEOK Partners, which include the following:
	•	the Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;
	•	the Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and
	•	the Natural Gas Pipelines segment operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities.
	Change in Reportable Segments - On January 31, 2014, we completed the separation of our former natural gas distribution business into a stand-alone publicly traded company called ONE Gas. ONE Gas consists of our former Natural Gas Distribution segment. On March 31, 2014, we completed the accelerated wind down of our Energy Services segment. These former segments are included in discontinued operations for all periods presented. See Notes A and B for additional information.
	Following the separation of our natural gas distribution business into ONE Gas and wind down of our energy services business, our chief operating decision maker reviews the financial performance of each of the three businesses of ONEOK Partners on a regular basis to assess the performance of, and allocate resources to, ONEOK Partners. As a result, effective for the first quarter 2014, our reportable segments have changed to reflect the three business segments of ONEOK Partners. Prior periods presented have been recast to conform to the current presentation.
	Accounting Policies - We evaluate performance based principally on each segment’s operating income and equity earnings. The accounting policies of the segments are described in Note A of the Notes to Consolidated Financial Statements in our Annual Report.  Affiliate and intersegment sales are recorded on the same basis as sales to unaffiliated customers.  Net margin is comprised of total revenues less cost of sales and fuel.  Cost of sales and fuel includes commodity purchases, fuel, storage and transportation costs. Revenues from sales and services provided by ONEOK Partners to our former natural gas distribution business, which were previously disclosed as intersegment revenues and eliminated in consolidation, are now reported as third-party revenues.
	Customers - The primary customers of the Natural Gas Gathering and Processing segment are major and independent crude oil and natural gas production companies.  The Natural Gas Liquids segment’s customers are primarily NGL and natural gas gathering and processing companies, major and independent crude oil and natural gas production companies, propane distributors, ethanol producers and petrochemical, refining and NGL marketing companies. The Natural Gas Pipelines segment’s customers include natural gas distribution, electric-generation, natural gas marketing, industrial and major and independent crude oil and natural gas production companies.
	For the three and nine months ended September 30, 2014 and 2013, ONEOK Partners had no single customer from which it received 10 percent or more of consolidated revenues.
	Operating Segment Information - The following tables set forth certain selected financial information for our and ONEOK Partners’ operating segments for the periods indicated:
	Three Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations
	30-Sep-14	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	374,403		$	2,667,939		$	77,027		$	776		$	3,120,145
	Intersegment revenues	403,399			66,581			2,133			(472,113		)	—
	Total revenues	$	777,802		$	2,734,520		$	79,160		$	(471,337	)	$	3,120,145
	Net margin	$	178,171		$	282,963		$	73,399		$	2,408		$	536,941
	Operating costs	64,279			76,946			27,998			3,272			172,495
	Depreciation and amortization	31,327			31,661			10,913			687			74,588
	Gain (loss) on sale of assets	324			(535		)	1,746			(1		)	1,534
	Operating income	$	82,889		$	173,821		$	36,234		$	(1,552	)	$	291,392
	Equity earnings (loss) from investments	$	(71,069	)	$	4,351		$	14,371		$	—		$	(52,347	)
	Capital expenditures	$	214,917		$	153,785		$	10,650		$	2,833		$	382,185
	(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $190.3 million, of which $170.1 million was related to sales within the segment, net margin of $94.3 million and operating income of $46.4 million.
	(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $65.2 million, net margin of $57.4 million and operating income of $23.4 million.
	Three Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
	30-Sep-13	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	162,677		$	2,840,108		$	50,624		$	648		$	3,054,057
	Sales to affiliated customers	57,400			—			23,924			—			81,324
	Intersegment revenues	312,940			34,740			1,330			(349,010		)	—
	Total revenues	$	533,017		$	2,874,848		$	75,878		$	(348,362	)	$	3,135,381
	Net margin	$	130,882		$	226,242		$	69,457		$	(2,359	)	$	424,222
	Operating costs	45,074			57,010			23,457			5,460			131,001
	Depreciation and amortization	27,356			22,993			10,833			668			61,850
	Gain (loss) on sale of assets	31			7			(16		)	(1		)	21
	Operating income	$	58,483		$	146,246		$	35,151		$	(8,488	)	$	231,392
	Equity earnings from investments	$	4,668		$	6,336		$	16,464		$	—		$	27,468
	Capital expenditures	$	204,542		$	230,780		$	11,148		$	91,017		$	537,487
	(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $147.1 million, of which $130.2 million was related to sales within the segment, net margin of $89.5 million and operating income of $53.4 million.
	(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $57.5 million, net margin of $52.8 million and operating income of $22.6 million.
	(c) - Other and Eliminations includes capital expenditures of discontinued operations of $83.8 million.
	Nine Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
	30-Sep-14	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	1,095,531		$	7,950,930		$	247,420		$	2,916		$	9,296,797
	Sales to affiliated customers	41,214			—			12,312			—			53,526
	Intersegment revenues	1,126,547			160,712			6,206			(1,293,465		)	—
	Total revenues	$	2,263,292		$	8,111,642		$	265,938		$	(1,290,549	)	$	9,350,323
	Net margin	$	486,695		$	818,086		$	242,359		$	(4,092	)	$	1,543,048
	Operating costs	188,489			218,129			82,747			4,263			493,628
	Depreciation and amortization	89,612			89,848			32,623			2,046			214,129
	Gain (loss) on sale of assets	277			(572		)	1,663			165			1,533
	Operating income	$	208,871		$	509,537		$	128,652		$	(10,236	)	$	836,824
	Equity earnings (loss) from investments	$	(60,484	)	$	13,574		$	53,657		$	—		$	6,747
	Investments in unconsolidated affiliates	$	253,930		$	484,238		$	390,341		$	—		$	1,128,509
	Total assets	$	4,415,814		$	7,337,688		$	1,832,368		$	726,326		$	14,312,196
	Noncontrolling interests in consolidated subsidiaries	$	4,394		$	—		$	—		$	3,131,769		$	3,136,163
	Capital expenditures	$	506,016		$	637,524		$	25,987		$	34,859		$	1,204,386
(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $479.4 million, of which $417.0 million was related to sales within the segment, net margin of $263.4 million and operating income of $126.0 million.
(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $214.8 million, net margin of $185.5 million and operating income of $84.6 million.
(c) - Other and Eliminations includes assets and capital expenditures of discontinued operations of $84.2 million and $23.9 million, respectively.
Nine Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
	Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
30-Sep-13	Processing
	(Thousands of dollars)
Sales to unaffiliated customers	$	466,631		$	7,539,470		$	158,960		$	1,961		$	8,167,022
Sales to affiliated customers	179,636			—			75,662			—			255,298
Intersegment revenues	806,523			91,161			2,327			(900,011		)	—
Total revenues	$	1,452,790		$	7,630,631		$	236,949		$	(898,050	)	$	8,422,320
Net margin	$	365,436		$	632,087		$	211,224		$	(660	)	$	1,208,087
Operating costs	141,737			171,076			75,608			9,480			397,901
Depreciation and amortization	76,366			65,033			32,687			1,930			176,016
Gain (loss) on sale of assets	344			10			(12		)	(1		)	341
Operating income	$	147,677		$	395,988		$	102,917		$	(12,071	)	$	634,511
Equity earnings from investments	$	16,228		$	15,383		$	48,133		$	—		$	79,744
Investments in unconsolidated affiliates	$	331,124		$	494,702		$	376,047		$	—		$	1,201,873
Total assets	$	3,808,135		$	6,610,205		$	1,786,413		$	5,405,590		$	17,610,343
Noncontrolling interests in consolidated subsidiaries	$	4,574		$	—		$	—		$	2,496,378		$	2,500,952
Capital expenditures	$	574,509		$	774,284		$	22,497		$	226,530		$	1,597,820
(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $376.9 million, of which $321.3 million was related to sales within the segment, net margin of $227.8 million and operating income of $129.0 million.
(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $182.0 million, net margin of $162.5 million and operating income of $67.0 million.
(c) - Other and Eliminations includes assets and capital expenditures of discontinued operations of $4.0 billion and $206.4 million, respectively.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Accounting	'
	Our accompanying unaudited consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. These statements have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair presentation of the results for the interim periods presented.  All such adjustments are of a normal recurring nature. The 2013 year-end consolidated balance sheet data was derived from our audited financial statements but does not include all disclosures required by GAAP.  These unaudited consolidated financial statements should be read in conjunction with our audited consolidated financial statements in our Annual Report.
	Our significant accounting policies are consistent with those disclosed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.
	Organization and Nature of Operations - We are the sole general partner and own limited partner units of ONEOK Partners (NYSE: OKS), which together represent an aggregate 38.3 percent interest in ONEOK Partners at September 30, 2014. On January 31, 2014, we completed the separation of our natural gas distribution business into a stand-alone publicly traded company called ONE Gas (NYSE: OGS). On March 31, 2014, we completed the accelerated wind down of our energy services business. The results of operations for our former natural gas distribution and energy services businesses have been classified as discontinued operations for all periods presented. Following the ONE Gas separation and wind down of our energy services business, our primary source of income and cash flow is generated from our investment in ONEOK Partners. See Note B for additional information.
	Unless indicated otherwise, the information in the Notes to the Consolidated Financial Statements relates to our continuing operations.
Segment Reporting, Policy	'
	Change in Reportable Segments - Following the separation of our natural gas distribution business into ONE Gas and wind down of our energy services business, our chief operating decision maker reviews the financial performance of each of the three businesses of ONEOK Partners on a regular basis to assess the performance of, and allocate resources to, ONEOK Partners. As a result, our reportable segments have changed effective for the first quarter 2014 to reflect the three business segments of ONEOK Partners, which include the following:
	•	the Natural Gas Gathering and Processing segment, which gathers, treats and processes natural gas;
	•	the Natural Gas Liquids segment, which gathers, treats, fractionates and transports NGLs and stores, markets and distributes NGL products; and
	•	the Natural Gas Pipelines segment, which operates regulated interstate and intrastate natural gas transmission pipelines and natural gas storage facilities.
	We have reflected the change in reporting segments for all periods presented. See Note N for additional information.
Income Taxes	'
	Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse. Deferred tax liabilities and deferred income tax expense were reduced by $34.6 million in the first quarter 2014 due to a reduction in our estimate of the effective state income tax rate to reflect a change in the mix of taxable income in the states in which we now operate, resulting from the separation of our former natural gas distribution business and the wind down of our energy services business. We also recorded a valuation allowance of $8.2 million in the first quarter 2014 for state tax credits as it is more likely than not that we will not be able to utilize these credits as a result of the separation of our former natural gas distribution business and the wind down of our energy services business. Together, these adjustments resulted in a net $26.4 million reduction in deferred tax liabilities and deferred income tax expense.
Accounting Standards Update 2014-08 [Member]	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
New Accounting Pronouncement or Change in Accounting Principle, Description	'In April 2014, the FASB issued ASU 2014-08, bReporting Discontinued Operations and Disclosures of Disposals of Components of an Entity,b which alters the definition of a discontinued operation to include only asset disposals that represent a strategic shift with a major effect on an entity's operations and financial results.B The amendments also require more extensive disclosures about a discontinued operationbs assets, liabilities, income, expenses and cash flows. This guidance will be effective for interim and annual periods for all assets that are disposed of or classified as being held for sale in fiscal years that begin on or after December 15, 2014. We will adopt this guidance beginning in the first quarter 2015, and it could impact us in the future if we dispose of any individually significant components.
Accounting Standards Update 2014-09 [Member]	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
New Accounting Pronouncement or Change in Accounting Principle, Description	'In May 2014, the FASB issued ASU 2014-09, bRevenue from Contracts with Customers,b which outlines the principles an entity must apply to measure and recognize revenue for entities that enter into contracts to provide goods or services to their customers. The core principle is that an entity should recognize revenue at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. The amendments also require more extensive disaggregated revenue disclosures in interim and annual financial statements. This update will be effective for interim and annual periods that begin on or after December 15, 2016, with either retrospective application for all periods presented or retrospective application with a cumulative effect adjustment. We will adopt this guidance beginning in the first quarter 2017, and we are evaluating the impact on us.
Accounting Standards Update 2014-15 [Domain]	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
New Accounting Pronouncement or Change in Accounting Principle, Description	'In August 2014, the FASB issued ASU 2014-15, bGoing Concern,b which provides guidance on determining when and how to disclose going-concern uncertainties in the financial statements. The new standard requires management to perform interim and annual assessments of an entitybs ability to continue as a going concern within one year of the date the financial statements are issued. An entity must provide certain disclosures if conditions or events raise substantial doubt about the entitybs ability to continue as a going concern. The standard applies to all entities and is effective for annual periods ending after December 15, 2016, and interim periods thereafter, with early adoption permitted. We will adopt this guidance beginning in the first quarter 2017, and we do not expect it to materially impact us.

FAIR_VALUE_MEASUREMENTS_Fair_V

FAIR VALUE MEASUREMENTS Fair Value Accounting Policy (Policies)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments, Policy [Policy Text Block]	'
	Determining Fair Value - We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.  We use market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed.  We measure the fair value of groups of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.
	In the first quarter 2014, outstanding commodity derivative positions with third parties entered into by our energy services business on ONEOK Partners’ behalf were transferred to ONEOK Partners. Beginning in the second quarter 2014, ONEOK Partners enters into all commodity derivative financial contracts directly with unaffiliated third parties.
	While many of the contracts in ONEOK Partners’ portfolio are executed in liquid markets where price transparency exists, some contracts are executed in markets for which market prices may exist, but the market may be relatively inactive.  This results in limited price transparency that requires management’s judgment and assumptions to estimate fair values.  For certain transactions, ONEOK Partners utilizes modeling techniques using NYMEX-settled pricing data and implied forward LIBOR curves. Inputs into ONEOK Partners’ fair value estimates include commodity-exchange prices, over-the-counter quotes, historical correlations of pricing data and LIBOR and other liquid money-market instrument rates.  ONEOK Partners also utilizes internally developed basis curves that incorporate observable and unobservable market data.  ONEOK Partners validates its valuation inputs with third-party information and settlement prices from other sources, where available.
	In addition, as prescribed by the income approach, ONEOK Partners computes the fair value of its derivative portfolio by discounting the projected future cash flows from its derivative assets and liabilities to present value using interest-rate yields to calculate present-value discount factors derived from LIBOR, Eurodollar futures and interest-rate swaps.  ONEOK Partners also takes into consideration the potential impact on market prices of liquidating positions in an orderly manner over a reasonable period of time under current market conditions.  It considers current market data in evaluating counterparties’, as well as its own, nonperformance risk, net of collateral, by using specific and sector bond yields and monitoring the credit default swap markets.  Although ONEOK Partners uses its best estimates to determine the fair value of the derivative contracts it has executed, the ultimate market prices realized could differ from its estimates, and the differences could be material.
	The fair value of ONEOK Partners’ forward-starting interest-rate swaps is determined using financial models that incorporate the implied forward LIBOR yield curve for the same period as the future interest-rate swap settlements.
	Fair Value Hierarchy - At each balance sheet date, we and ONEOK Partners utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in the financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:
	•	Level 1 - fair value measurements are based on unadjusted quoted prices in active markets, including NYMEX-settled prices and actively quoted prices for equity securities. These balances are comprised predominantly of exchange-traded derivative contracts for natural gas and crude oil. Also included in Level 1 are equity securities.
	•	Level 2 - fair value measurements are based on significant observable pricing inputs, such as NYMEX-settled prices for natural gas and crude oil, and financial models that utilize implied forward LIBOR yield curves for interest-rate swaps.
	•	Level 3 - fair value measurements are based on inputs that may include one or more unobservable inputs, including internally developed basis curves that incorporate observable and unobservable market data, NGL price curves from broker quotes, market volatilities derived from the most recent NYMEX close spot prices and forward LIBOR curves, and adjustments for the credit risk of ONEOK Partners’ counterparties.  ONEOK Partners corroborates the data on which its fair value estimates are based using its market knowledge of recent transactions, analysis of historical correlations and validation with independent broker quotes.  These balances categorized as Level 3 are comprised of derivatives for natural gas and NGLs.  ONEOK Partners does not believe that its Level 3 fair value estimates have a material impact on its results of operations, as the majority of its derivatives are accounted for as hedges for which ineffectiveness is not material.
Investment, Policy [Policy Text Block]	'
	During the three months ended September 30, 2014, ONEOK Partners recorded a noncash impairment to its equity investment in Bighorn Gas Gathering. The valuation of this investment required use of significant unobservable inputs. ONEOK Partners used an income approach to estimate the fair value of its investment. ONEOK Partners’ discounted cash flow analysis included the following inputs that are not readily available: a discount rate reflective of its cost of capital and estimated contract rates, volumes, operating and maintenance costs and capital expenditures. The estimated fair value of this investment is classified as Level 3.

RISK_MANAGEMENT_AND_HEDGING_AC1

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Policies)	9 Months Ended
	Sep. 30, 2014
RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES [Abstract]	'
Accounting treatment for derivative instruments	'
	Accounting Treatment - We and ONEOK Partners record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery.  The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it.
	The table below summarizes the various ways in which we and ONEOK Partners account for derivative instruments and the impact on our consolidated financial statements:
			Recognition and Measurement
	Accounting Treatment		Balance Sheet		Income Statement
	Normal purchases and normal	-	Fair value not recorded	-	Change in fair value not recognized in earnings
	sales
	Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in earnings
	Cash flow hedge	-	Recorded at fair value	-	Ineffective portion of the gain or loss on the
					derivative instrument is recognized in earnings
		-	Effective portion of the gain or loss on the	-	Effective portion of the gain or loss on the
			derivative instrument is reported initially		derivative instrument is reclassified out of
			as a component of accumulated other		accumulated other comprehensive income (loss)
			comprehensive income (loss)		into earnings when the forecasted transaction
					affects earnings
	Fair value hedge	-	Recorded at fair value	-	The gain or loss on the derivative instrument is
					recognized in earnings
		-	Change in fair value of the hedged item is	-	Change in fair value of the hedged item is
			recorded as an adjustment to book value		recognized in earnings
	Under certain conditions, we and ONEOK Partners designate derivative instruments as a hedge of exposure to changes in fair values or cash flows. We and ONEOK Partners formally document all relationships between hedging instruments and hedged items, as well as risk-management objectives, strategies for undertaking various hedge transactions and methods for assessing and testing correlation and hedge ineffectiveness. We and ONEOK Partners specifically identify the forecasted transaction that has been designated as the hedged item in a cash flow hedge relationship. We and ONEOK Partners assess the effectiveness of hedging relationships quarterly by performing an effectiveness analysis on fair value and cash flow hedging relationships to determine whether the hedge relationships are highly effective on a retrospective and prospective basis.  ONEOK Partners also documents normal purchases and normal sales transactions expected to result in physical delivery and that are exempted from derivative accounting treatment.
	The realized revenues and purchase costs of derivative instruments that are not considered held for trading purposes and derivatives that qualify as normal purchases or normal sales that are expected to result in physical delivery are reported on a gross basis.
	Cash flows from futures, forwards and swaps that are accounted for as hedges are included in the same category as the cash flows from the related hedged items in our Consolidated Statements of Cash Flows.

ONEOK_PARTNERS_Policies

ONEOK PARTNERS (Policies)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Allocation of Costs Incurred by Related Party, Policy [Policy Text Block]	'
	We provide a variety of services to our affiliates, including cash management and financial services, employee benefits, legal and administrative services by our employees and management, insurance and office space leased in our headquarters building and other field locations.  Where costs are incurred specifically on behalf of an affiliate, the costs are billed directly to the affiliate by us.  In other situations, the costs may be allocated to the affiliates through a variety of methods, depending upon the nature of the expenses and the activities of the affiliates.  Beginning in the second quarter 2014, we allocate substantially all of our general overhead costs to ONEOK Partners as a result of the separation of our natural gas distribution business and the wind down of our energy services business in the first quarter 2014.  For the first quarter 2014 and the three and nine months ended September 30, 2013, it is not practicable to determine what these general overhead costs would have been on a stand-alone basis.
Business Combinations Policy [Policy Text Block]	'
	ONEOK Partners accounted for this acquisition as a business combination, which, among other things, requires assets acquired and liabilities assumed to be measured at their acquisition-date fair values.
Cash Distributions	'
	Cash Distributions - We receive distributions from ONEOK Partners on the common and Class B units we own and the 2 percent general partner interest, which includes our incentive distribution rights.  Under the Partnership Agreement, distributions are made to the partners with respect to each calendar quarter in an amount equal to 100 percent of available cash as defined in the Partnership Agreement.  Available cash generally will be distributed 98 percent to limited partners and 2 percent to the general partner.  The general partner’s percentage interest in quarterly distributions is increased after certain specified target levels are met during the quarter.  Under the incentive distribution provisions, as set forth in the Partnership Agreement, the general partner receives:
	•	15 percent of amounts distributed in excess of $0.3025 per unit;
	•	25 percent of amounts distributed in excess of $0.3575 per unit; and
	•	50 percent of amounts distributed in excess of $0.4675 per unit.

SEGMENTS_Policies

SEGMENTS (Policies)	9 Months Ended
	Sep. 30, 2014
Segment Accounting Policies [Abstract]	'
Segments Accounting Policies [Text Block]	'
	Accounting Policies - We evaluate performance based principally on each segment’s operating income and equity earnings. The accounting policies of the segments are described in Note A of the Notes to Consolidated Financial Statements in our Annual Report.  Affiliate and intersegment sales are recorded on the same basis as sales to unaffiliated customers.  Net margin is comprised of total revenues less cost of sales and fuel.  Cost of sales and fuel includes commodity purchases, fuel, storage and transportation costs. Revenues from sales and services provided by ONEOK Partners to our former natural gas distribution business, which were previously disclosed as intersegment revenues and eliminated in consolidation, are now reported as third-party revenues.

DISCONTINUED_OPERATIONS_Tables

DISCONTINUED OPERATIONS (Tables)	9 Months Ended
	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Restructuring and Related Costs [Table Text Block]	'
	The following table summarizes the change in our liability related to released capacity contracts for the period indicated:
		Nine Months Ended
		September 30, 2014
		(Millions of dollars)
	Beginning balance	$	122
	Noncash charges	1.7
	Settlements	(38.6		)
	Accretion	1.5
	Ending balance	$	86.6
Components of Net Income (Loss) [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	Results of Operations of Discontinued Operations - The results of operations for our former natural gas distribution and energy services businesses have been reported as discontinued operations for all periods presented. The tables below provide selected financial information reported in discontinued operations in the Consolidated Statements of Income:
			Three Months Ended										Nine Months Ended
			30-Sep-14										September 30, 2014
			Natural Gas			Energy				Total			Natural Gas				Energy			Total
			Distribution			Services							Distribution				Services
			(Thousands of dollars)
	Revenues		$	—		$	—			$	—		$	287,249			$	353,404		$	640,653
	Cost of sales and fuel		—			—				—			190,893				364,648			555,541
	Net margin		—			—				—			96,356				(11,244		)	85,112
	Operating costs		—			142			(b)	142			60,847			(a)	4,664			65,511
	Depreciation and amortization		—			—				—			11,035				319			11,354
	Operating income (loss)		—			(142		)		(142		)	24,474				(16,227		)	8,247
	Other income (expense), net		—			—				—			(888		)		(7		)	(895		)
	Interest expense, net		—			—				—			(4,592		)		(413		)	(5,005		)
	Income taxes		—			(29		)		(29		)	(16,415		)		7,662			(8,753		)
	Income (loss) from discontinued operations, net		$	—		$	(171	)		$	(171	)	$	2,579			$	(8,985	)	$	(6,406	)
	(a) - Includes approximately $23.0 million for the nine months ended September 30, 2014, of costs related to the ONE Gas separation.
	(b) - Represents primarily accretion expense.
			Three Months Ended										Nine Months Ended
			30-Sep-13										30-Sep-13
			Natural Gas			Energy				Total			Natural Gas				Energy			Total
			Distribution			Services							Distribution				Services
			(Thousands of dollars)
	Revenues		$	219,723		$	298,145			$	517,868		$	1,167,260			$	1,128,324		$	2,295,584
	Cost of sales and fuel		60,492			320,411				380,903			577,912				1,287,731			1,865,643
	Net margin		159,231			(22,266		)		136,965			589,348				(159,407		)	429,941
	Operating costs		103,682			2,178				105,860			321,467				10,545			332,012
	Depreciation and amortization		32,347			70				32,417			100,118				209			100,327
	Operating income (loss)		23,202			(24,514		)		(1,312		)	167,763				(170,161		)	(2,398		)
	Other income (expense), net		1,354			41				1,395			1,929				86			2,015
	Interest expense, net		(15,233		)	(488		)		(15,721		)	(45,702		)		(1,581		)	(47,283		)
	Income taxes		(3,571		)	9,083				5,512			(44,372		)		62,832			18,460
	Income (loss) from discontinued operations, net		$	5,752		$	(15,878	)		$	(10,126	)	$	79,618			$	(108,824	)	$	(29,206	)
Carrying Value of Assets and Liabilities [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	'
	Statement of Financial Position of Discontinued Operations - The following table presents the carrying value of assets and liabilities of our former natural gas distribution and energy services businesses included in assets and liabilities of discontinued operations in the Consolidated Balance Sheets for the period presented:
			31-Dec-13
			Natural Gas			Energy				Total
			Distribution			Services
			(Thousands of dollars)
	Assets
	Cash and cash equivalents		$	3,535		$	213			$	3,748
	Accounts receivable, net		368,214			87,315				455,529
	Natural gas and natural gas liquids in storage		166,128			62,663				228,791
	Other current assets		30,328			29,476				59,804
	Net property, plant and equipment		3,065,272			279				3,065,551
	Goodwill		157,953			—				157,953
	Other assets		402,161			385				402,546
	Total assets		$	4,193,591		$	180,331			$	4,373,922
	Liabilities
	Current maturities of long-term debt		$	6		$	—			$	6
	Accounts payable		168,785			77,287				246,072
	Other current liabilities		168,964			40,646				209,610
	Long-term debt, excluding current maturities		1,318			—				1,318
	Deferred income taxes		826,921			(35,221		)		791,700
	Other deferred credits		184,214			70,998				255,212
	Total liabilities		$	1,350,208		$	153,710			$	1,503,918

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Recurring Fair Value Measurments	'
	Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements for our continuing operations for the periods indicated:
		September 30, 2014
		Level 1			Level 2			Level 3			Total - Gross			Netting (a)			Total - Net (b)
		(Thousands of dollars)
	Assets
	Derivatives
	Commodity contracts
	Financial contracts	$	9,093		$	439		$	—		$	9,532		$	(3,004	)	$	6,528
	Physical contracts	—			—			2,900			2,900			(329		)	2,571
	Interest-rate contracts	—			20,962			—			20,962			—			20,962
	Total derivatives	9,093			21,401			2,900			33,394			(3,333		)	30,061
	Available-for-sale investment securities (c)	1,599			—			—			1,599			—			1,599
	Total assets	$	10,692		$	21,401		$	2,900		$	34,993		$	(3,333	)	$	31,660
	Liabilities
	Derivatives
	Commodity contracts
	Financial contracts	$	(83	)	$	—		$	(2,921	)	$	(3,004	)	$	3,004		$	—
	Physical contracts	—			—			(683		)	(683		)	329			(354		)
	Interest-rate contracts	—			(23,308		)	—			(23,308		)	—			(23,308		)
	Total liabilities	$	(83	)	$	(23,308	)	$	(3,604	)	$	(26,995	)	$	3,333		$	(23,662	)
	(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis.  ONEOK Partners nets derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and ONEOK Partners.  At September 30, 2014, we and ONEOK Partners had no cash collateral held or posted.
	(b) - Included in other current assets, other assets or other current liabilities in our Consolidated Balance Sheets.
	(c) - Available-for-sale investment securities represent assets of ONEOK.
		December 31, 2013
		Level 1			Level 2			Level 3			Total - Gross			Netting (a)			Total - Net (b)
		(Thousands of dollars)
	Assets
	Derivatives
	Commodity contracts
	Financial contracts	$	—		$	3,657		$	2,812		$	6,469		$	(1,746	)	$	4,723
	Physical contracts	—			—			2,023			2,023			(946		)	1,077
	Interest-rate contracts	—			54,503			—			54,503			—			54,503
	Total derivatives	—			58,160			4,835			62,995			(2,692		)	60,303
	Available-for-sale investment securities (c)	1,569			—			—			1,569			—			1,569
	Total assets	$	1,569		$	58,160		$	4,835		$	64,564		$	(2,692	)	$	61,872
	Liabilities
	Derivatives
	Commodity contracts
	Financial contracts	$	—		$	(2,953	)	$	(2,154	)	$	(5,107	)	$	1,746		$	(3,361	)
	Physical contracts	—			—			(3,463		)	(3,463		)	946			(2,517		)
	Total derivative liabilities	$	—		$	(2,953	)	$	(5,617	)	$	(8,570	)	$	2,692		$	(5,878	)
	(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis.  ONEOK Partners nets derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and ONEOK Partners. At December 31, 2013, we and ONEOK Partners had no cash collateral held or posted.
	(b) - Included in other current assets, other assets or other current liabilities in our Consolidated Balance Sheets.
	(c) - Available-for-sale investment securities represent assets of ONEOK.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	'
	The following table sets forth the reconciliation of our Level 3 fair value measurements for our continuing operations for the periods indicated:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
	Derivative Assets (Liabilities)	2014			2013			2014			2013
		(Thousands of dollars)
	Net assets (liabilities) at beginning of period	$	(1,313	)	$	7,682		$	(782	)	$	(2,423	)
	Total realized/unrealized gains (losses):
	Included in earnings (a)	207			—			(688		)	—
	Included in other comprehensive income (loss)	402			(7,181		)	(2,968		)	2,924
	Purchases, issuances and settlements	—			—			3,734			—
	Net assets (liabilities) at end of period	$	(704	)	$	501		$	(704	)	$	501
	(a) - Reported in commodity sales revenues in our Consolidated Statements of Income.

RISK_MANAGEMENT_AND_HEDGING_AC2

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair value of derivatives	'
	Fair Values of Derivative Instruments - See Note C for a discussion of the inputs associated with our fair value measurements. The following table sets forth the fair values of derivative instruments for our continuing operations for the periods indicated:
		September 30, 2014								December 31, 2013
		Assets (a)				(Liabilities) (a)				Assets (a)				(Liabilities) (a)
		(Thousands of dollars)
	Derivatives designated as hedging instruments
	Commodity contracts
	Financial contracts	$	9,532			$	(3,004	)		$	6,469			$	(5,107	)
	Physical contracts	2,554				(608		)		1,064				(3,463		)
	Interest-rate contracts	20,962				(23,308		)		54,503				—
	Total derivatives designated as hedging instruments	33,048				(26,920		)		62,036				(8,570		)
	Derivatives not designated as hedging instruments
	Commodity contracts
	Physical contracts	346				(75		)		959				—
	Total derivatives not designated as hedging instruments	346				(75		)		959				—
	Total derivatives	$	33,394			$	(26,995	)		$	62,995			$	(8,570	)
	(a) - Included on a net basis in other current assets, other assets or other current liabilities on our Consolidated Balance Sheets.
Notional amounts of derivative instruments	'
	Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments for our continuing operations for the periods indicated:
			September 30, 2014								December 31, 2013
		Contract	Purchased/				Sold/				Purchased/				Sold/
		Type	Payor				Receiver				Payor				Receiver
	Derivatives designated as hedging instruments:
	Cash flow hedges
	Fixed price
	- Natural gas (Bcf)	Futures and swaps	—				(31.2		)		—				(48.1		)
	- Crude oil and NGLs (MMbbl)	Futures, forwards	—				(1.7		)		—				(4.0		)
		and swaps
	Basis
	- Natural gas (Bcf)	Futures and swaps	—				(31.2		)		—				(48.1		)
	Interest-rate contracts (Millions of dollars)	Forward-starting	$	900			$	—			$	400			$	—
		swaps
Schedule of cash flow hedging instruments effect on comprehensive income (loss)	'
	The following table sets forth the effects of cash flow hedges recognized in other comprehensive income (loss) for our continuing operations for the periods indicated:
	Derivatives in Cash Flow	Three Months Ended								Nine Months Ended
	Hedging Relationships	September 30,								September 30,
		2014				2013				2014				2013
		(Thousands of dollars)
	Commodity contracts	$	17,133			$	(10,317	)		$	(24,743	)		$	3,060
	Interest-rate contracts	(9,755		)		6,721				(56,849		)		35,726
	Total unrealized gain (loss) recognized in other comprehensive	$	7,378			$	(3,596	)		$	(81,592	)		$	38,786
	income (loss) on derivatives(effective portion)
Schedule of cash flow hedging instruments effect on income	'
	The following table sets forth the effect of cash flow hedges on our Consolidated Statements of Income for our continuing operations for the periods indicated:
	Derivatives in Cash Flow	Location of Gain (Loss) Reclassified from	Three Months Ended								Nine Months Ended
	Hedging Relationships	Accumulated Other Comprehensive Income	September 30,								September 30,
		(Loss) into Net Income (Effective Portion)	2014				2013				2014				2013
			(Thousands of dollars)
	Commodity contracts	Commodity sales revenues	$	(355	)		$	361			$	(31,961	)		$	4,172
	Interest-rate contracts	Interest expense	(3,525		)		(3,696		)		(18,372		)		(10,840		)
	Total gain (loss) reclassified from accumulated other comprehensive		$	(3,880	)		$	(3,335	)		$	(50,333	)		$	(6,668	)
	income (loss) into net income on derivatives (effective portion)

LONGTERM_DEBT_Long_term_debt_t

LONG-TERM DEBT Long term debt table (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]	'
Schedule of Long-term Debt Instruments [Table Text Block]	'
	The following table details information about each of the three series of Senior Notes:
		(In millions)
	2.07% notes due February 1, 2019	$	300
	3.61% notes due February 1, 2024	300
	4.658% notes due February 1, 2044	600
	Total	$	1,200

EQUITY_Tables

EQUITY (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Changes in equity, including other comprehensive income, net of tax	'
	The following table sets forth the changes in equity attributable to us and our noncontrolling interests, including other comprehensive income, net of tax, for the periods indicated:
		Three Months Ended									Three Months Ended
		30-Sep-14									30-Sep-13
		ONEOK			Noncontrolling			Total			ONEOK			Noncontrolling			Total
		Shareholders’			Interests in			Equity			Shareholders’			Interests in			Equity
		Equity			Consolidated						Equity			Consolidated
					Subsidiaries									Subsidiaries
		(Thousands of dollars)
	Beginning balance	$	656,425		$	3,136,906		$	3,793,331		$	2,085,349		$	2,089,007		$	4,174,356
	Net income	64,458			49,823			114,281			62,356			85,342			147,698
	Other comprehensive income	5,471			6,172			11,643			(7,522		)	(1,964		)	(9,486		)
	(loss)
	Common stock issued	5,757			—			5,757			4,142			—			4,142
	Common stock dividends	(121,367		)	—			(121,367		)	(78,367		)	—			(78,367		)
	Issuance of common units of	11,185			62,078			73,263			81,502			420,391			501,893
	ONEOK Partners
	Distribution of ONE Gas to shareholders	1,735			—			1,735			—			—			—
	Distributions to noncontrolling	—			(118,816		)	(118,816		)	—			(91,824		)	(91,824		)
	interests
	Other	(432		)	—			(432		)	42,234			—			42,234
	Ending balance	$	623,232		$	3,136,163		$	3,759,395		$	2,189,694		$	2,500,952		$	4,690,646
		Nine Months Ended									Nine Months Ended
		30-Sep-14									30-Sep-13
		ONEOK			Noncontrolling			Total			ONEOK			Noncontrolling			Total
		Shareholders’			Interests in			Equity			Shareholders’			Interests in			Equity
		Equity			Consolidated						Equity			Consolidated
					Subsidiaries									Subsidiaries
		(Thousands of dollars)
	Beginning balance	$	2,337,851		$	2,507,329		$	4,845,180		$	2,129,609		$	2,102,841		$	4,232,450
	Net income	219,563			241,980			461,543			175,796			217,102			392,898
	Other comprehensive income	10,942			(27,336		)	(16,394		)	(2,694		)	22,612			19,918
	(loss)
	Common stock issued	19,661			—			19,661			11,892			—			11,892
	Common stock dividends	(321,051		)	—			(321,051		)	(226,349		)	—			(226,349		)
	Issuance of common units of	138,310			739,348			877,658			84,458			431,743			516,201
	ONEOK Partners
	Distribution of ONE Gas to shareholders	(1,745,689		)	—			(1,745,689		)	—			—			—
	Distributions to noncontrolling	—			(325,158		)	(325,158		)	—			(273,346		)	(273,346		)
	interests
	Other	(36,355		)	—			(36,355		)	16,982			—			16,982
	Ending balance	$	623,232		$	3,136,163		$	3,759,395		$	2,189,694		$	2,500,952		$	4,690,646

ACCUMULATED_OTHER_COMPREHENSIV1

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Accumulated other comprehensive income (loss)	'
	The following table sets forth the balance in accumulated other comprehensive income (loss) for the period indicated:
		Unrealized Gains				Unrealized				Pension and				Accumulated
		(Losses) on Energy				Holding Gains				Postretirement				Other
		Marketing and				(Losses)				Benefit Plan				Comprehensive
		Risk-Management				on Investment				Obligations (a)				Income (Loss) (a)
		Assets/Liabilities (a)				Securities (a)
		(Thousands of dollars)
	1-Jan-14	$	(43,168	)		$	857			$	(79,676	)		$	(121,987	)
	Other comprehensive income (loss) before	(20,717		)		(6		)		(79		)		(20,802		)
	reclassifications
	Amounts reclassified from accumulated other	23,596				—				8,148				31,744
	comprehensive income (loss)
	Other comprehensive income	2,879				(6		)		8,069				10,942
	(loss) attributable to ONEOK
	Transfer to ONE Gas	—				—				3,389				3,389
	September 30, 2014	$	(40,289	)		$	851			$	(68,218	)		$	(107,656	)
	(a) All amounts are presented net of tax.
Statement [Line Items]	'
Disclosure of Reclassification Amount [Text Block]	'
	The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) on our Consolidated Statements of Income for the periods indicated:
	Details about Accumulated Other		Three Months Ended								Nine Months Ended							Affected Line Item in
	Comprehensive Income (Loss)		September 30,								September 30,							the Consolidated
	Components		2014				2013				2014				2013			Statements of Income
			(Thousands of dollars)
	Unrealized (gains) losses on energy marketing and risk-management assets/liabilities
	Commodity contracts		$	355			$	(361	)		$	31,961			$	(4,172	)	Commodity sales revenues
	Interest-rate contracts		3,525				3,696				18,372				10,840			Interest expense
			3,880				3,335				50,333				6,668			Income before income taxes
			(748		)		(781		)		(9,845		)		(1,836		)	Income tax expense
			3,132				2,554				40,488				4,832			Income from continuing operations
			—				(1,765		)		7,682				(138		)	Income (loss) from discontinued operations
			3,132				789				48,170				4,694			Net income
	Noncontrolling interest		1,928				1,317				24,574				1,923			Less: Net income attributable to noncontrolling interest
			$	1,204			$	(528	)		$	23,596			$	2,771		Net income (loss) attributable to ONEOK
	Pension and postretirement benefit plan obligations (a)
	Amortization of net loss		$	4,009			$	5,078			$	11,936			$	15,234
	Amortization of unrecognized prior service cost		(368		)		(113		)		(1,102		)		(339		)
	Amortization of unrecognized net asset at adoption		—				7				—				21
			3,641				4,972				10,834				14,916			Income before income taxes
			(1,456		)		(1,924		)		(4,334		)		(5,770		)	Income tax expense
			2,185				3,048				6,500				9,146			Income from continuing operations
			—				8,379				1,648				25,381			Income from discontinued operations
			$	2,185			$	11,427			$	8,148			$	34,527		Net income attributable to ONEOK
	Total reclassifications for the period attributable to ONEOK		$	3,389			$	10,899			$	31,744			$	37,298		Net income attributable to ONEOK
	(a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note J for additional detail of our net periodic benefit cost.

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:
		Three Months Ended September 30, 2014
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	64,629	209,489	$	0.31
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		1,270
	Income from continuing operations attributable to ONEOK available for common	$	64,629	210,759	$	0.31
	stock and common stock equivalents
		Three Months Ended September 30, 2013
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	72,482	206,235	$	0.35
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		3,658
	Income from continuing operations attributable to ONEOK available for common	$	72,482	209,893	$	0.35
	stock and common stock equivalents
		Nine Months Ended September 30, 2014
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	225,969	209,341	$	1.08
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		1,141
	Income from continuing operations attributable to ONEOK available for common	$	225,969	210,482	$	1.07
	stock and common stock equivalents
		Nine Months Ended September 30, 2013
		Income		Shares	Per Share
					Amount
		(Thousands, except per share amounts)
	Basic EPS from continuing operations
	Income from continuing operations attributable to ONEOK available for common	$	205,002	205,952	$	1
	stock
	Diluted EPS from continuing operations
	Effect of dilutive securities	—		3,456
	Income from continuing operations attributable to ONEOK available for common	$	205,002	209,408	$	0.98
	stock and common stock equivalents

EMPLOYEE_BENEFIT_PLANS_Tables

EMPLOYEE BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
The components of net periodic benefit cost	'
	The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for our continuing operations for the periods indicated:
		Pension Benefits						Pension Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(Thousands of dollars)
	Components of net periodic benefit cost
	Service cost	$	1,784		$	1,532		$	5,429		$	4,596
	Interest cost	4,488			3,906			13,744			11,718
	Expected return on assets	(4,775		)	(4,969		)	(14,644		)	(14,907		)
	Amortization of unrecognized prior service cost	48			58			144			174
	Amortization of net loss	3,798			4,755			11,309			14,265
	Other	16			—			136			—
	Net periodic benefit cost	$	5,359		$	5,282		$	16,118		$	15,846
		Postretirement Benefits						Postretirement Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(Thousands of dollars)
	Components of net periodic benefit cost
	Service cost	$	175		$	118		$	533		$	354
	Interest cost	603			298			1,825			894
	Expected return on assets	(513		)	(314		)	(1,623		)	(942		)
	Amortization of unrecognized net asset at adoption	—			7			—			21
	Amortization of unrecognized prior service cost	(416		)	(171		)	(1,246		)	(513		)
	Amortization of net loss	211			323			627			969
	Other	—			—			(2		)	—
	Net periodic benefit cost	$	60		$	261		$	114		$	783

UNCONSOLIDATED_AFFILIATES_Tabl

UNCONSOLIDATED AFFILIATES (Tables)	9 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Equity Earnings from Investments	'
	Equity Earnings from Investments - The following table sets forth ONEOK Partners’ equity earnings (losses) from investments for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014			2013
		(Thousands of dollars)
	Share of investee earnings (loss)
	Northern Border Pipeline	$	14,371		$	16,464	$	53,657		$	48,133
	Overland Pass Pipeline Company	3,856			5,783		12,708			14,210
	Fort Union Gas Gathering	4,169			2,946		12,578			9,895
	Bighorn Gas Gathering (a)	(23,472		)	559		(24,745		)	1,897
	Other	2,150			1,716		5,970			5,609
	Total share of investee earnings	1,074			27,468		60,168			79,744
	Impairment of investment in Bighorn Gas Gathering	(53,421		)	—		(53,421		)	—
	Equity earnings (loss) from investments	$	(52,347	)	$	27,468	$	6,747		$	79,744
	(a) Includes proportionate share of investee impairment of long-lived assets charge of $23.0 million.
Unconsolidated Affiliates Financial Information [Table Text Block]	'
	Unconsolidated Affiliates Financial Information - The following table sets forth summarized combined financial information of ONEOK Partners’ unconsolidated affiliates for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014			2013
		(Thousands of dollars)
	Income Statement
	Operating revenues	$	126,218		$	131,959	$	403,006		$	391,912
	Operating expenses (a)	$	123,620		$	63,971	$	247,169		$	189,366
	Net income (loss) (a)	$	(5,119	)	$	61,630	$	134,432		$	185,580
	Distributions paid to ONEOK Partners	$	31,574		$	34,409	$	109,223		$	103,913
	(a) - Includes long-lived asset impairment charge on Bighorn Gas Gathering.

ONEOK_PARTNERS_Tables

ONEOK PARTNERS (Tables)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Ownership interest in ONEOK Partners	'
	Ownership Interest in ONEOK Partners - Our ownership interest in ONEOK Partners is shown in the table below at September 30, 2014:
	General partner interest	2	%
	Limited partner interest (a)	36.3	%
	Total ownership interest	38.3	%
	(a) - Represents 19.8 million common units and approximately 73.0 million Class B units, which are convertible, at our option, into common units.
ONEOK Partners' Distributions Paid	'
	The following table shows ONEOK Partners’ distributions paid in the periods indicated:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands, except per unit amounts)
	Distribution per unit	$	0.76	$	0.72	$	2.235	$	2.145
	General partner distributions	$	5,501	$	4,512	$	15,361	$	13,399
	Incentive distributions	80,381		62,634		220,547		184,647
	Distributions to general partner	85,882		67,146		235,908		198,046
	Limited partner distributions to ONEOK	70,519		66,807		207,381		199,031
	Limited partner distributions to noncontrolling interest	118,644		91,676		324,805		272,904
	Total distributions paid	$	275,045	$	225,629	$	768,094	$	669,981
ONEOK Partners' Distributions Declared	'
	The following table shows ONEOK Partners’ distributions declared for the periods indicated and paid within 45 days of the end of the period:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands, except per unit amounts)
	Distribution per unit	$	0.775	$	0.725	$	2.28	$	2.16
	General partner distributions	$	5,683	$	4,795	$	16,195	$	13,776
	Incentive distributions	84,452		67,017		236,744		191,226
	Distributions to general partner	90,135		71,812		252,939		205,002
	Limited partner distributions to ONEOK	71,911		67,271		211,557		200,422
	Limited partner distributions to noncontrolling interest	122,105		100,650		345,255		283,365
	Total distributions declared	$	284,151	$	239,733	$	809,751	$	688,789
ONEOK Partners' transactions	'
	The following table shows ONEOK Partners’ transactions with us for the periods indicated:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(Thousands of dollars)
	Revenues	$	—	$	81,324	$	53,526	$	255,298
	Expenses
	Cost of sales and fuel	$	—	$	9,562	$	10,835	$	27,855
	Administrative and general expenses	84,221		58,549		240,172		192,906
	Total expenses	$	84,221	$	68,111	$	251,007	$	220,761

SEGMENTS_Tables

SEGMENTS (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segments	'
	The following tables set forth certain selected financial information for our and ONEOK Partners’ operating segments for the periods indicated:
	Three Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations
	30-Sep-14	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	374,403		$	2,667,939		$	77,027		$	776		$	3,120,145
	Intersegment revenues	403,399			66,581			2,133			(472,113		)	—
	Total revenues	$	777,802		$	2,734,520		$	79,160		$	(471,337	)	$	3,120,145
	Net margin	$	178,171		$	282,963		$	73,399		$	2,408		$	536,941
	Operating costs	64,279			76,946			27,998			3,272			172,495
	Depreciation and amortization	31,327			31,661			10,913			687			74,588
	Gain (loss) on sale of assets	324			(535		)	1,746			(1		)	1,534
	Operating income	$	82,889		$	173,821		$	36,234		$	(1,552	)	$	291,392
	Equity earnings (loss) from investments	$	(71,069	)	$	4,351		$	14,371		$	—		$	(52,347	)
	Capital expenditures	$	214,917		$	153,785		$	10,650		$	2,833		$	382,185
	(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $190.3 million, of which $170.1 million was related to sales within the segment, net margin of $94.3 million and operating income of $46.4 million.
	(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $65.2 million, net margin of $57.4 million and operating income of $23.4 million.
	Three Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
	30-Sep-13	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	162,677		$	2,840,108		$	50,624		$	648		$	3,054,057
	Sales to affiliated customers	57,400			—			23,924			—			81,324
	Intersegment revenues	312,940			34,740			1,330			(349,010		)	—
	Total revenues	$	533,017		$	2,874,848		$	75,878		$	(348,362	)	$	3,135,381
	Net margin	$	130,882		$	226,242		$	69,457		$	(2,359	)	$	424,222
	Operating costs	45,074			57,010			23,457			5,460			131,001
	Depreciation and amortization	27,356			22,993			10,833			668			61,850
	Gain (loss) on sale of assets	31			7			(16		)	(1		)	21
	Operating income	$	58,483		$	146,246		$	35,151		$	(8,488	)	$	231,392
	Equity earnings from investments	$	4,668		$	6,336		$	16,464		$	—		$	27,468
	Capital expenditures	$	204,542		$	230,780		$	11,148		$	91,017		$	537,487
	(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $147.1 million, of which $130.2 million was related to sales within the segment, net margin of $89.5 million and operating income of $53.4 million.
	(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $57.5 million, net margin of $52.8 million and operating income of $22.6 million.
	(c) - Other and Eliminations includes capital expenditures of discontinued operations of $83.8 million.
	Nine Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
	30-Sep-14	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	1,095,531		$	7,950,930		$	247,420		$	2,916		$	9,296,797
	Sales to affiliated customers	41,214			—			12,312			—			53,526
	Intersegment revenues	1,126,547			160,712			6,206			(1,293,465		)	—
	Total revenues	$	2,263,292		$	8,111,642		$	265,938		$	(1,290,549	)	$	9,350,323
	Net margin	$	486,695		$	818,086		$	242,359		$	(4,092	)	$	1,543,048
	Operating costs	188,489			218,129			82,747			4,263			493,628
	Depreciation and amortization	89,612			89,848			32,623			2,046			214,129
	Gain (loss) on sale of assets	277			(572		)	1,663			165			1,533
	Operating income	$	208,871		$	509,537		$	128,652		$	(10,236	)	$	836,824
	Equity earnings (loss) from investments	$	(60,484	)	$	13,574		$	53,657		$	—		$	6,747
	Investments in unconsolidated affiliates	$	253,930		$	484,238		$	390,341		$	—		$	1,128,509
	Total assets	$	4,415,814		$	7,337,688		$	1,832,368		$	726,326		$	14,312,196
	Noncontrolling interests in consolidated subsidiaries	$	4,394		$	—		$	—		$	3,131,769		$	3,136,163
	Capital expenditures	$	506,016		$	637,524		$	25,987		$	34,859		$	1,204,386
	(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $479.4 million, of which $417.0 million was related to sales within the segment, net margin of $263.4 million and operating income of $126.0 million.
	(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $214.8 million, net margin of $185.5 million and operating income of $84.6 million.
	(c) - Other and Eliminations includes assets and capital expenditures of discontinued operations of $84.2 million and $23.9 million, respectively.
	Nine Months Ended	Natural Gas			Natural Gas			Natural Gas			Other and			Total
		Gathering and			Liquids (a)			Pipelines (b)			Eliminations (c)
	30-Sep-13	Processing
		(Thousands of dollars)
	Sales to unaffiliated customers	$	466,631		$	7,539,470		$	158,960		$	1,961		$	8,167,022
	Sales to affiliated customers	179,636			—			75,662			—			255,298
	Intersegment revenues	806,523			91,161			2,327			(900,011		)	—
Total revenues	$	1,452,790		$	7,630,631		$	236,949		$	(898,050	)	$	8,422,320
Net margin	$	365,436		$	632,087		$	211,224		$	(660	)	$	1,208,087
Operating costs	141,737			171,076			75,608			9,480			397,901
Depreciation and amortization	76,366			65,033			32,687			1,930			176,016
Gain (loss) on sale of assets	344			10			(12		)	(1		)	341
Operating income	$	147,677		$	395,988		$	102,917		$	(12,071	)	$	634,511
Equity earnings from investments	$	16,228		$	15,383		$	48,133		$	—		$	79,744
Investments in unconsolidated affiliates	$	331,124		$	494,702		$	376,047		$	—		$	1,201,873
Total assets	$	3,808,135		$	6,610,205		$	1,786,413		$	5,405,590		$	17,610,343
Noncontrolling interests in consolidated subsidiaries	$	4,574		$	—		$	—		$	2,496,378		$	2,500,952
Capital expenditures	$	574,509		$	774,284		$	22,497		$	226,530		$	1,597,820
(a) - The Natural Gas Liquids segment has regulated and nonregulated operations. The Natural Gas Liquids segment’s regulated operations had revenues of $376.9 million, of which $321.3 million was related to sales within the segment, net margin of $227.8 million and operating income of $129.0 million.
(b) - The Natural Gas Pipelines segment has regulated and nonregulated operations. The Natural Gas Pipelines segment’s regulated operations had revenues of $182.0 million, net margin of $162.5 million and operating income of $67.0 million.
(c) - Other and Eliminations includes assets and capital expenditures of discontinued operations of $4.0 billion and $206.4 million, respectively.

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Entity [Line Items]	'	'
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	38.30%	41.20%
Reduction in deferred tax liabilities and deferred income tax expense	$34.60	'
Valuation allowance for deferred tax asset	8.2	'
Net change in deferred taxes from change in tax rate and valuation allowance	$26.40	'

DISCONTINUED_OPERATIONS_Detail

DISCONTINUED OPERATIONS (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Mar. 31, 2014

Jan. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Distribution Regulated Segment [Member]

Distribution Regulated Segment [Member]

2014 [Member]

2015 [Member]

2016 [Member]

2017 - 2023 [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

Distribution Regulated Segment [Member]

Distribution Regulated Segment [Member]

Distribution Regulated Segment [Member]

Energy Services [Member]

Energy Services [Member]

Energy Services [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated Charges Attributable To Exit Activities

$86,600,000

'

$86,600,000

'

$122,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Costs related to separation

'

'

23,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related Party Transaction, Other Revenues from Transactions with Related Party

'

'

'

'

'

'

'

'

'

'

'

17,700,000

7,500,000

45,800,000

63,600,000

46,000,000

209,500,000

Assets

14,312,196,000

17,610,343,000

14,312,196,000

17,610,343,000

17,741,481,000

'

4,300,000,000

'

'

'

'

'

'

'

'

'

'

Liabilities

'

'

'

'

'

'

2,600,000,000

'

'

'

'

'

'

'

'

'

'

Distribution of ONE Gas to shareholders

1,735,000

0

-1,745,689,000

0

'

1,700,000,000

'

'

'

'

'

'

'

'

'

'

'

Noncash charges

'

'

1,739,000

130,753,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Settlements

'

'

-38,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion

'

'

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effect on Future Cash Flows, Amount

'

'

$53,000,000

'

'

'

'

$8,000,000

$23,000,000

$11,000,000

$11,000,000

'

'

'

'

'

'

DISCONTINUED_OPERATIONS_Discon

DISCONTINUED OPERATIONS Discontinued Operation Income Statement Disclosures (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Revenues	$0	$517,868,000	$640,653,000	$2,295,584,000
Cost of sales and fuel	0	380,903,000	555,541,000	1,865,643,000
Net margin	0	136,965,000	85,112,000	429,941,000
Operating costs	142,000	105,860,000	65,511,000	332,012,000
Depreciation and amortization	0	32,417,000	11,354,000	100,327,000
Operating income (loss)	-142,000	-1,312,000	8,247,000	-2,398,000
Other income (expense), net	0	1,395,000	-895,000	2,015,000
Interest expense, net	0	-15,721,000	-5,005,000	-47,283,000
Income taxes	-29,000	5,512,000	-8,753,000	18,460,000
Income (loss) from discontinued operations, net	-171,000	-10,126,000	-6,406,000	-29,206,000
Costs related to separation	'	'	23,000,000	'
Distribution Regulated Segment [Member]	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Revenues	0	219,723,000	287,249,000	1,167,260,000
Cost of sales and fuel	0	60,492,000	190,893,000	577,912,000
Net margin	0	159,231,000	96,356,000	589,348,000
Operating costs	0	103,682,000	60,847,000	321,467,000
Depreciation and amortization	0	32,347,000	11,035,000	100,118,000
Operating income (loss)	0	23,202,000	24,474,000	167,763,000
Other income (expense), net	0	1,354,000	-888,000	1,929,000
Interest expense, net	0	-15,233,000	-4,592,000	-45,702,000
Income taxes	0	-3,571,000	-16,415,000	-44,372,000
Income (loss) from discontinued operations, net	0	5,752,000	2,579,000	79,618,000
Energy Services [Member]	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Revenues	0	298,145,000	353,404,000	1,128,324,000
Cost of sales and fuel	0	320,411,000	364,648,000	1,287,731,000
Net margin	0	-22,266,000	-11,244,000	-159,407,000
Operating costs	142,000	2,178,000	4,664,000	10,545,000
Depreciation and amortization	0	70,000	319,000	209,000
Operating income (loss)	-142,000	-24,514,000	-16,227,000	-170,161,000
Other income (expense), net	0	41,000	-7,000	86,000
Interest expense, net	0	-488,000	-413,000	-1,581,000
Income taxes	-29,000	9,083,000	7,662,000	62,832,000
Income (loss) from discontinued operations, net	($171,000)	($15,878,000)	($8,985,000)	($108,824,000)

DISCONTINUED_OPERATIONS_Discon1

DISCONTINUED OPERATIONS Discontinued Operations Balance Sheet Disclosures (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Cash and cash equivalents	'	$3,748,000
Accounts receivable, net	'	455,529,000
Disposal Group, Including Discontinued Operation, Inventory	'	228,791,000
Other current assets	'	59,804,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	'	3,065,551,000
Disposal Group, Including Discontinued Operation, Goodwill	'	157,953,000
Other assets	'	402,546,000
Total assets	'	4,373,922,000
Current maturities of long-term debt	'	6,000
Accounts payable	'	246,072,000
Other current liabilities	'	209,610,000
Long-term debt, excluding current maturities	'	1,318,000
Deferred income taxes	'	791,700,000
Other deferred credits	'	255,212,000
Total liabilities	'	1,503,918,000
Distribution Regulated Segment [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Cash and cash equivalents	'	3,535,000
Accounts receivable, net	'	368,214,000
Disposal Group, Including Discontinued Operation, Inventory	'	166,128,000
Other current assets	'	30,328,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	'	3,065,272,000
Disposal Group, Including Discontinued Operation, Goodwill	'	157,953,000
Other assets	'	402,161,000
Total assets	'	4,193,591,000
Current maturities of long-term debt	'	6,000
Accounts payable	'	168,785,000
Other current liabilities	'	168,964,000
Long-term debt, excluding current maturities	'	1,318,000
Deferred income taxes	'	826,921,000
Other deferred credits	'	184,214,000
Total liabilities	'	1,350,208,000
Energy Services [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Cash and cash equivalents	'	213,000
Accounts receivable, net	'	87,315,000
Disposal Group, Including Discontinued Operation, Inventory	'	62,663,000
Other current assets	'	29,476,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	'	279,000
Disposal Group, Including Discontinued Operation, Goodwill	'	0
Other assets	'	385,000
Total assets	'	180,331,000
Current maturities of long-term debt	'	0
Accounts payable	'	77,287,000
Other current liabilities	'	40,646,000
Long-term debt, excluding current maturities	'	0
Deferred income taxes	'	-35,221,000
Other deferred credits	'	70,998,000
Total liabilities	'	153,710,000
Income taxes receivable	43,800,000	'
Current tax assets	12,400,000	'
Deferred tax assets	25,700,000	'
Current capacity release obligations	43,500,000	'
Current tax liability	11,700,000	'
Noncurrent capacity release obligations	$43,100,000	'

FAIR_VALUE_MEASUREMENTS_Part_1

FAIR VALUE MEASUREMENTS - Part 1 (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Derivatives	'	'	'	'	'
Cash collateral held	'	'	'	'	$0
Cash collateral posted	0	'	0	'	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0	0	0	0	'
Fair Value, Measurements, Recurring [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	6,528,000	'	6,528,000	'	4,723,000
Commodity contracts - physical	2,571,000	'	2,571,000	'	1,077,000
Interest-rate contracts	20,962,000	'	20,962,000	'	54,503,000
Total derivatives assets	30,061,000	'	30,061,000	'	60,303,000
Other	'	'	'	'	'
Available-for-sale investment securities	1,599,000	'	1,599,000	'	1,569,000
Total assets	31,660,000	'	31,660,000	'	61,872,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	0	'	0	'	-3,361,000
Commodity contracts - physical	-354,000	'	-354,000	'	-2,517,000
Interest Rate Derivative Liabilities, at Fair Value	-23,308,000	'	-23,308,000	'	'
Total liabilities	-23,662,000	'	-23,662,000	'	-5,878,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	9,093,000	'	9,093,000	'	0
Commodity contracts - physical	0	'	0	'	0
Interest-rate contracts	0	'	0	'	0
Total derivatives assets	9,093,000	'	9,093,000	'	0
Other	'	'	'	'	'
Available-for-sale investment securities	1,599,000	'	1,599,000	'	1,569,000
Total assets	10,692,000	'	10,692,000	'	1,569,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	-83,000	'	-83,000	'	0
Commodity contracts - physical	0	'	0	'	0
Interest Rate Derivative Liabilities, at Fair Value	0	'	0	'	'
Total liabilities	-83,000	'	-83,000	'	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	439,000	'	439,000	'	3,657,000
Commodity contracts - physical	0	'	0	'	0
Interest-rate contracts	20,962,000	'	20,962,000	'	54,503,000
Total derivatives assets	21,401,000	'	21,401,000	'	58,160,000
Other	'	'	'	'	'
Available-for-sale investment securities	0	'	0	'	0
Total assets	21,401,000	'	21,401,000	'	58,160,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	0	'	0	'	-2,953,000
Commodity contracts - physical	0	'	0	'	0
Interest Rate Derivative Liabilities, at Fair Value	-23,308,000	'	-23,308,000	'	'
Total liabilities	-23,308,000	'	-23,308,000	'	-2,953,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	0	'	0	'	2,812,000
Commodity contracts - physical	2,900,000	'	2,900,000	'	2,023,000
Interest-rate contracts	0	'	0	'	0
Total derivatives assets	2,900,000	'	2,900,000	'	4,835,000
Other	'	'	'	'	'
Available-for-sale investment securities	0	'	0	'	0
Total assets	2,900,000	'	2,900,000	'	4,835,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	-2,921,000	'	-2,921,000	'	-2,154,000
Commodity contracts - physical	-683,000	'	-683,000	'	-3,463,000
Interest Rate Derivative Liabilities, at Fair Value	0	'	0	'	'
Total liabilities	-3,604,000	'	-3,604,000	'	-5,617,000
Fair Value, Measurements, Recurring [Member] | Total Gross, Fair Value Disclosure [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	9,532,000	'	9,532,000	'	6,469,000
Commodity contracts - physical	2,900,000	'	2,900,000	'	2,023,000
Interest-rate contracts	20,962,000	'	20,962,000	'	54,503,000
Total derivatives assets	33,394,000	'	33,394,000	'	62,995,000
Other	'	'	'	'	'
Available-for-sale investment securities	1,599,000	'	1,599,000	'	1,569,000
Total assets	34,993,000	'	34,993,000	'	64,564,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	-3,004,000	'	-3,004,000	'	-5,107,000
Commodity contracts - physical	-683,000	'	-683,000	'	-3,463,000
Interest Rate Derivative Liabilities, at Fair Value	-23,308,000	'	-23,308,000	'	'
Total liabilities	-26,995,000	'	-26,995,000	'	-8,570,000
Fair Value, Measurements, Recurring [Member] | Netting [Member]	'	'	'	'	'
Derivatives	'	'	'	'	'
Commodity contracts - financial	-3,004,000	'	-3,004,000	'	-1,746,000
Commodity contracts - physical	-329,000	'	-329,000	'	-946,000
Interest-rate contracts	0	'	0	'	0
Total derivatives assets	-3,333,000	'	-3,333,000	'	-2,692,000
Other	'	'	'	'	'
Available-for-sale investment securities	0	'	0	'	0
Total assets	-3,333,000	'	-3,333,000	'	-2,692,000
Derivatives	'	'	'	'	'
Commodity contracts - financial	3,004,000	'	3,004,000	'	1,746,000
Commodity contracts - physical	329,000	'	329,000	'	946,000
Interest Rate Derivative Liabilities, at Fair Value	0	'	0	'	'
Total liabilities	$3,333,000	'	$3,333,000	'	$2,692,000

FAIR_VALUE_MEASUREMENTS_Fair_V1

FAIR VALUE MEASUREMENTS, Fair Value Measurements - Part 2 (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Total realized/unrealized gains (losses):	'	'	'	'	'	'	'	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	$0	$0	$0	$0	'	'	'	'
Derivative Financial Instruments, Assets Liabilities [Member]	'	'	'	'	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Calculation [Roll Forward]	'	'	'	'	'	'	'	'
Net assets (liabilities)	-704	501	-704	501	-1,313	-782	7,682	-2,423
Total realized/unrealized gains (losses):	'	'	'	'	'	'	'	'
Included in earnings	207	0	-688	0	'	'	'	'
Included in other comprehensive income (loss)	402	-7,181	-2,968	2,924	'	'	'	'
Purchases, issuances and settlements	$0	$0	$3,734	$0	'	'	'	'

FAIR_VALUE_MEASUREMENTS_Fair_V2

FAIR VALUE MEASUREMENTS, Fair Value - Part 3 (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Billions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term Debt, Fair Value	$7.90	$8.20
Long-term Debt, Book Value	$7.20	$7.80

RISK_MANAGEMENT_AND_HEDGING_AC3

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 1 (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]	'	'
Assets	$33,394,000	$62,995,000
Liabilities	-26,995,000	-8,570,000
Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	33,048,000	62,036,000
Liabilities	-26,920,000	-8,570,000
Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	346,000	959,000
Liabilities	-75,000	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	20,962,000	54,503,000
Liabilities	-23,308,000	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative, Notional Amount	900,000,000	'
Notional Amount Of Cash Flow Hedge Instruments Greater Than 12 Months	400,000,000	'
Cash Flow Hedging [Member] | Commodity Contract [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Commodity cash flow hedge gain to be reclassified	1,500,000	'
Commodity cash flow hedge gain to be reclassified within 12 months	1,300,000	'
Commodity Cash Flow Hedge Gain To Be Reclassified After Next 12 Months Net	200,000	'
Cash Flow Hedging [Member] | Interest Rate Contract [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps.	-38,600,000	'
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	-4,800,000	'
ONEOK Partners [Member] | Cash Flow Hedging [Member] | Forward Starting Interest Rate Swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount Of Cash Flow Hedge Instruments Greater Than 12 Months	'	400,000,000
Financial Derivative Instrument [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	9,532,000	6,469,000
Liabilities	-3,004,000	-5,107,000
Physical Derivative Instrument [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	2,554,000	1,064,000
Liabilities	-608,000	-3,463,000
Physical Derivative Instrument [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Assets	346,000	959,000
Liabilities	($75,000)	$0
Natural Gas Liquids [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative nonmonetary notional amount	0	0
Natural Gas Pipelines [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative nonmonetary notional amount	0	0

RISK_MANAGEMENT_AND_HEDGING_AC4

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 2 (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	MMcf	MMcf
Derivative [Line Items]	'	'
Derivative, Net Liability Position, Aggregate Fair Value	0	'
Cash Flow Hedging [Member] | Fixed Price [Member] | Sold [Member] | Natural Gas [Member] | Swap [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	-31,200	-48,100
Cash Flow Hedging [Member] | Fixed Price [Member] | Sold [Member] | Crude oil and NGLs [Member] | Forwards and Swaps Contracts [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	-1.7	-4
Cash Flow Hedging [Member] | Fixed Price [Member] | Purchased [Member] | Natural Gas [Member] | Swap [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	0	0
Cash Flow Hedging [Member] | Fixed Price [Member] | Purchased [Member] | Crude oil and NGLs [Member] | Forwards and Swaps Contracts [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	0	0
Cash Flow Hedging [Member] | Basis [Member] | Sold [Member] | Natural Gas [Member] | Swap [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	-31,200	-48,100
Cash Flow Hedging [Member] | Basis [Member] | Purchased [Member] | Natural Gas [Member] | Swap [Member]	'	'
Derivative [Line Items]	'	'
Derivative nonmonetary notional amount	0	0
Cash Flow Hedging [Member] | Interest Rate Forward Starting Swaps [Member] | Sold [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	0	0
Cash Flow Hedging [Member] | Interest Rate Forward Starting Swaps [Member] | Purchased [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	900	400
Interest Rate Contract [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	900	'

RISK_MANAGEMENT_AND_HEDGING_AC5

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total unrealized gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	'	'	($20,717,000)	'
Cash Flow Hedging [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	4,600,000	0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Tax	0	0	3,100,000	0
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)	-3,880,000	-3,335,000	-50,333,000	-6,668,000
Total unrealized gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	7,378,000	-3,596,000	-81,592,000	38,786,000
Commodity Contract [Member] | Cash Flow Hedging [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total unrealized gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	17,133,000	-10,317,000	-24,743,000	3,060,000
Commodity cash flow hedge gain to be reclassified	1,500,000	'	1,500,000	'
Commodity cash flow hedge gain to be reclassified within 12 months	1,300,000	'	1,300,000	'
Commodity Cash Flow Hedge Gain To Be Reclassified After Next 12 Months Net	200,000	'	200,000	'
Commodity Contract [Member] | Revenues [Member] | Cash Flow Hedging [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)	-355,000	361,000	-31,961,000	4,172,000
Interest Rate Contract [Member] | Cash Flow Hedging [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total unrealized gain (loss) recognized in other comprehensive income (loss) on derivatives (effective portion)	-9,755,000	6,721,000	-56,849,000	35,726,000
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps.	-38,600,000	'	-38,600,000	'
Amount of loss to be recognized in the next 12 months	-4,800,000	'	-4,800,000	'
Interest Rate Contract [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total gain (loss) reclassified from accumulated other comprehensive income (loss) into net income on derivatives (effective portion)	($3,525,000)	($3,696,000)	($18,372,000)	($10,840,000)

CREDIT_FACILITIES_AND_SHORTTER1

CREDIT FACILITIES AND SHORT-TERM NOTES PAYABLE (Details) (USD $)	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2014
			Partnership Credit Agreement [Member]	ONEOK Credit Agreement [Member]
Line of Credit Facility [Line Items]	'	'	'	'
Line Of Credit Facility Option To Increase Borrowing Capacity	'	'	$2,400,000,000	$500,000,000
Maximum Amount Of Commercial Paper	1,700,000,000	1,200,000,000	'	'
Commercial paper	'	'	0	'
Letters of credit issued	'	'	14,000,000	2,100,000
Total short-term borrowings authorized by our general partner's Board of Directors	'	'	2,500,000,000	'
Interest rate description	'	'	'borrowings, if any, will accrue at LIBOR plus 117.5 basis points	'borrowings, if any, will accrue at LIBOR plus 125 basis points
Annual fee descripton	'	'	'the annual facility fee is 20 basis points	'the annual facility fee is 25 basis points
Indebtedness To Adjusted EBITDA Maximum	'	'	5	4
Acquisition price threshold for increase in permitted debt to EBITDA covenant ratio	'	'	25,000,000	'
Indebtedness To Adjusted EBITDA From Acquisitions Maximum	'	'	5.5	'
Indebtedness To Adjusted EBITDA Current	'	'	3.4	1.9
Partnership Credit Agreement sublimit for issuance of standby letters of credit	'	'	100,000,000	50,000,000
line of credit facility swingline subfacility	'	'	150,000,000	50,000,000
Maximum borrowing capacity	'	'	1,700,000,000	300,000,000
Write off of Deferred Debt Issuance Cost	'	'	'	2,900,000
Short-term Bank Loans and Notes Payable	'	'	$0	$0

LONGTERM_DEBT_Details

LONG-TERM DEBT (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Note Payable from Public Offering Due 2022 [Member]

note payable due 2015 [Member]

ONE Gas [Member]

ONE Gas [Member]

ONE Gas [Member]

ONE Gas [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Partnership Interest [Member]

Senior Notes [Member]

Rate

Rate

Notes Payable due 2019 [Member]

Notes Payable due 2024 [Member]

Notes Payable due 2044 [Member]

Note Payable from Public Offering Due 2018 [Member]

Note Payable from Public Offering Due 2023 [Member]

Note Payable from Public Offering Due 2043 [Member]

Partnership Interest [Member]

Rate

Rate

Rate

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

$7,200,000,000

$7,800,000,000

'

'

$1,200,000,000

$300,000,000

$300,000,000

$600,000,000

'

'

'

'

Related Party Transaction, Amounts of Transaction

1,130,000,000

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Amount

'

'

152,500,000

400,000,000

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

4.25%

5.20%

'

2.07%

3.61%

4.66%

3.20%

5.00%

6.20%

'

Early Repayment of Senior Debt

'

'

150,000,000

430,100,000

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

24,800,000

'

'

'

'

'

'

'

'

'

'

'

Senior Notes, Noncurrent

'

'

'

'

'

'

'

'

'

'

'

1,250,000,000

Long-term Debt, Gross

'

'

'

'

'

'

'

'

425,000,000

425,000,000

400,000,000

'

Proceeds from Debt, Net of Issuance Costs

'

'

'

'

'

'

'

'

'

'

'

$1,240,000,000

EQUITY_Details

EQUITY (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Common Stock, Dividends, Per Share, Cash Paid	$0.57	$0.56	$0.40	$0.38	$1.53	$1.10
Stockholders' equity, beginning balance	$3,793,331	'	$4,845,180	$4,174,356	$4,845,180	$4,232,450
Net income	114,281	'	'	147,698	461,543	392,898
Other comprehensive income (loss)	11,643	'	'	-9,486	-16,394	19,918
Common stock issued	5,757	'	'	4,142	19,661	11,892
Common stock dividends	-121,367	'	'	-78,367	-321,051	-226,349
Issuance of common units of ONEOK Partners	73,263	'	'	501,893	877,658	516,201
Distribution of ONE Gas to shareholders	1,735	'	'	0	-1,745,689	0
Distributions to noncontrolling interests	-118,816	'	'	-91,824	-325,158	-273,346
Other	-432	'	'	42,234	-36,355	16,982
Stockholders' equity, ending balance	3,759,395	3,793,331	'	4,690,646	3,759,395	4,690,646
Dividends declared per share of common stock	$0.59	'	'	'	'	'
Dividends Payable, Date of Record	3-Nov-14	'	'	'	'	'
Dividends Payable, Date to be Paid	14-Nov-14	'	'	'	'	'
ONEOK Shareholders' Equity [Member]	'	'	'	'	'	'
Stockholders' equity, beginning balance	656,425	'	2,337,851	2,085,349	2,337,851	2,129,609
Net income	64,458	'	'	62,356	219,563	175,796
Other comprehensive income (loss)	5,471	'	'	-7,522	10,942	-2,694
Common stock issued	5,757	'	'	4,142	19,661	11,892
Common stock dividends	-121,367	'	'	-78,367	-321,051	-226,349
Issuance of common units of ONEOK Partners	11,185	'	'	81,502	138,310	84,458
Distribution of ONE Gas to shareholders	1,735	'	'	0	-1,745,689	0
Distributions to noncontrolling interests	0	'	'	0	0	0
Other	-432	'	'	42,234	-36,355	16,982
Stockholders' equity, ending balance	623,232	'	'	2,189,694	623,232	2,189,694
Noncontrolling Interests in Consolidated Subsidiaries [Member]	'	'	'	'	'	'
Stockholders' equity, beginning balance	3,136,906	'	2,507,329	2,089,007	2,507,329	2,102,841
Net income	49,823	'	'	85,342	241,980	217,102
Other comprehensive income (loss)	6,172	'	'	-1,964	-27,336	22,612
Common stock issued	0	'	'	0	0	0
Common stock dividends	0	'	'	0	0	0
Issuance of common units of ONEOK Partners	62,078	'	'	420,391	739,348	431,743
Distribution of ONE Gas to shareholders	0	'	'	0	0	0
Distributions to noncontrolling interests	-118,816	'	'	-91,824	-325,158	-273,346
Other	0	'	'	0	0	0
Stockholders' equity, ending balance	$3,136,163	'	'	$2,500,952	$3,136,163	$2,500,952

ACCUMULATED_OTHER_COMPREHENSIV2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Part 1 (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Balance of Accumulated Other Comprehensive Income (Loss) [Abstract]	'	'	'	'	'
Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities	($40,289)	'	($40,289)	'	($43,168)
Unrealized Holding Gains (Losses) on Investment Securities	851	'	851	'	857
Pension and Postretirement Benefit Plan Obligations	-68,218	'	-68,218	'	-79,676
Accumulated Other Comprehensive Income (Loss)	-107,656	'	-107,656	'	-121,987
Other comprehensive income (loss) attributable to ONEOK [Abstract]	'	'	'	'	'
Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities	'	'	2,879	'	'
Unrealized Gains (Losses) on Energy Marketing and Risk Management Assets/Liabilities	'	'	-20,717	'	'
Unrealized Holding Gains (Losses) on Investment Securities	'	'	-6	'	'
Unrealized Holding Gains (Losses) on Investment Securities	'	'	0	'	'
Unrealized Holding Gains (Losses) on Investment Securities	107	-440	-6	-234	'
Pension and Postretirement Benefit Plan Obligations	'	'	-79	'	'
Pension and Postretirement Benefit Plan Obligations	2,185	-7,293	8,069	-21,637	'
Accumulated Other Comprehensive Income (Loss)	'	'	-20,802	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-3,132	-789	-48,170	-4,694	'
Accumulated Other Comprehensive Income (Loss)	3,389	10,899	31,744	37,298	'
Accumulated Other Comprehensive Income (Loss)	'	'	10,942	'	'
Transfer to ONE Gas [Abstract]	'	'	'	'	'
Unrealized gains (losses) on energy marketing and risk-management assets/liabilities	'	'	0	'	'
Unrealized holding gains (losses) on investment securities	'	'	0	'	'
Pension and postretirement benefit plan obligations	'	'	3,389	'	'
Accumulated other comprehensive income (loss)	'	'	3,389	'	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'	'
Other comprehensive income (loss) attributable to ONEOK [Abstract]	'	'	'	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-1,204	528	-23,596	-2,771	'
Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'	'	'
Other comprehensive income (loss) attributable to ONEOK [Abstract]	'	'	'	'	'
Pension and Postretirement Benefit Plan Obligations	$2,185	$11,427	$8,148	$34,527	'

ACCUMULATED_OTHER_COMPREHENSIV3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Part 2 (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Total reclassifications for the period attributable to ONEOK	$3,389	$10,899	$31,744	$37,298
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income tax expense	-748	333	-14,966	-1,748
Income net of tax	3,132	789	48,170	4,694
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income net of tax	1,204	-528	23,596	2,771
Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'	'
Pension and postretirement benefit plan obligations [Abstract]	'	'	'	'
Amortization of net loss	4,009	5,078	11,936	15,234
Amortization of unrecognized prior service cost	-368	-113	-1,102	-339
Amortization of unrecognized net asset at adoption	0	7	0	21
Income before income taxes	3,641	4,972	10,834	14,916
Income tax expense	-1,456	-1,924	-4,334	-5,770
Income net of tax	2,185	11,427	8,148	34,527
Sales [Member] | Commodity Contract [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Commodity sales revenues	355	-361	31,961	-4,172
Interest Expense [Member] | Interest Rate Contract [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Interest expense	3,525	3,696	18,372	10,840
Total before tax [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income before income taxes	3,880	3,335	50,333	6,668
Tax benefit [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income tax expense	-748	-781	-9,845	-1,836
Income from continuing operations | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income net of tax	3,132	2,554	40,488	4,832
Income from continuing operations | Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'	'
Pension and postretirement benefit plan obligations [Abstract]	'	'	'	'
Income net of tax	2,185	3,048	6,500	9,146
Income from discontinued operations | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income net of tax	0	-1,765	7,682	-138
Income from discontinued operations | Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'	'
Pension and postretirement benefit plan obligations [Abstract]	'	'	'	'
Income net of tax	0	8,379	1,648	25,381
Net income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income net of tax	3,132	789	48,170	4,694
Net income attributable to noncontrolling interest [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Net income attributable to noncontrolling interest	1,928	1,317	24,574	1,923
Cash Flow Hedging [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income before income taxes	-3,880	-3,335	-50,333	-6,668
Cash Flow Hedging [Member] | Sales [Member] | Commodity Contract [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income before income taxes	-355	361	-31,961	4,172
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contract [Member]	'	'	'	'
Unrealized (gains) losses on derivatives [Abstract]	'	'	'	'
Income before income taxes	($3,525)	($3,696)	($18,372)	($10,840)

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic EPS from continuing operations [Abstract]	'	'	'	'
Income from continuing operations attributable to ONEOK available for common stock	$64,629	$72,482	$225,969	$205,002
Weighted Average number of share, basic (in shares)	209,489	206,235	209,341	205,952
Per share amount, basic (in dollars per shares)	$0.31	$0.35	$1.08	$1
Diluted EPS from continuing operations [Abstract]	'	'	'	'
Effect of dilutive securities	0	0	0	0
Effect of dilutive securities, number of shares (in shares)	1,270	3,658	1,141	3,456
Income from continuing operations attributable to ONEOK available for common stock and common stock equivalents	$64,629	$72,482	$225,969	$205,002
Weighted Average number of share, diluted (in shares)	210,759	209,893	210,482	209,408
Per Share amount, diluted (in dollars per share)	$0.31	$0.35	$1.07	$0.98
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0

EMPLOYEE_BENEFIT_PLANS_Details

EMPLOYEE BENEFIT PLANS (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Benefits [Member]	'	'	'	'
Components of net periodic benefit cost	'	'	'	'
Service cost	$1,784	$1,532	$5,429	$4,596
Interest cost	4,488	3,906	13,744	11,718
Expected return on assets	-4,775	-4,969	-14,644	-14,907
Amortization of unrecognized prior service cost	48	58	144	174
Amortization of net loss	3,798	4,755	11,309	14,265
Other	16	0	136	0
Net periodic benefit cost	5,359	5,282	16,118	15,846
Postretirement Benefits [Member]	'	'	'	'
Components of net periodic benefit cost	'	'	'	'
Service cost	175	118	533	354
Interest cost	603	298	1,825	894
Expected return on assets	-513	-314	-1,623	-942
Amortization of unrecognized net asset at adoption	0	7	0	21
Amortization of unrecognized prior service cost	-416	-171	-1,246	-513
Amortization of net loss	211	323	627	969
Other	0	0	-2	0
Net periodic benefit cost	$60	$261	$114	$783

UNCONSOLIDATED_AFFILIATES_Deta

UNCONSOLIDATED AFFILIATES (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Northern Border Pipeline [Member]

Northern Border Pipeline [Member]

Northern Border Pipeline [Member]

Northern Border Pipeline [Member]

Overland Pass Pipeline Company [Member]

Overland Pass Pipeline Company [Member]

Overland Pass Pipeline Company [Member]

Overland Pass Pipeline Company [Member]

Fort Union Gas Gathering, L.L.C. [Member]

Fort Union Gas Gathering, L.L.C. [Member]

Fort Union Gas Gathering, L.L.C. [Member]

Fort Union Gas Gathering, L.L.C. [Member]

Bighorn Gas Gathering L.L.C. [Member]

Bighorn Gas Gathering L.L.C. [Member]

Bighorn Gas Gathering L.L.C. [Member]

Bighorn Gas Gathering L.L.C. [Member]

Bighorn Gas Gathering L.L.C. [Member]

Other Unconsolidated Affiliate [Member]

Other Unconsolidated Affiliate [Member]

Other Unconsolidated Affiliate [Member]

Other Unconsolidated Affiliate [Member]

Unconsolidated Affiliates [Member]

Unconsolidated Affiliates [Member]

Unconsolidated Affiliates [Member]

Unconsolidated Affiliates [Member]

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related Party Transaction, Expenses from Transactions with Related Party

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$15,000,000

$15,900,000

$43,500,000

$36,300,000

Equity Method Investment, Other than Temporary Impairment

'

'

-53,400,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity earnings from investments

-52,347,000

27,468,000

6,747,000

79,744,000

'

14,371,000

16,464,000

53,657,000

48,133,000

3,856,000

5,783,000

12,708,000

14,210,000

4,169,000

2,946,000

12,578,000

9,895,000

-23,472,000

559,000

-24,745,000

1,897,000

'

2,150,000

1,716,000

5,970,000

5,609,000

'

'

'

'

Income (loss) from equity method investments before impairments

1,074,000

27,468,000

60,168,000

79,744,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

impairment on equity method investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

76,400,000

'

'

'

'

'

'

'

'

'

'

Investments in unconsolidated affiliates

1,128,509,000

1,201,873,000

1,128,509,000

1,201,873,000

1,229,838,000

'

'

'

'

'

'

'

'

'

'

'

'

8,800,000

'

8,800,000

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23,000,000

'

'

'

'

'

'

'

'

Income Statement

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating revenues

126,218,000

131,959,000

403,006,000

391,912,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating expenses

123,620,000

63,971,000

247,169,000

189,366,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

-5,119,000

61,630,000

134,432,000

185,580,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distributions paid to ONEOK Partners

$31,574,000

$34,409,000

$109,223,000

$103,913,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ONEOK_PARTNERS_Details

ONEOK PARTNERS (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

ONEOK Partners [Member]

General Partner [Member]

Limited Partner [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Paid [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Distribution Declared [Member]

Issued Under Public Offering [Member]

Issued Under Public Offering [Member]

Paid-in Capital [Member]

Issued Under Equity Distribution Agreement [Member]

Issued Under Equity Distribution Agreement [Member]

Issued Under Equity Distribution Agreement [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

Partnership Credit Agreement [Member]

West Texas LPG Acquisition [Member]

Sage Creek Acquisition [Member]

Sage Creek Acquisition [Member]

Sage Creek Acquisition [Member]

Sage Creek Acquisition [Member]

Distribution Regulated Segment [Member]

Distribution Regulated Segment [Member]

Distribution Regulated Segment [Member]

Energy Services [Member]

Energy Services [Member]

Energy Services [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

ONEOK [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

General Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Limited Partner [Member]

Subsequent Event [Member]

Natural Gas Gathering And Processing [Member]

Natural Gas Liquids [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$800,000,000

'

'

'

'

Maximum Amount Of Commercial Paper

1,700,000,000

'

'

1,700,000,000

'

'

1,200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Public offering price of common units

$52.94

$49.61

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Units, Sold in Public Offering

13,900,000

11,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest (in hundreths)

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

36.30%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related Party Transaction, Other Revenues from Transactions with Related Party

'

'

'

'

'

'

'

17,700,000

7,500,000

45,800,000

63,600,000

46,000,000

209,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Limited Partner, Distribution Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14-Nov-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest

'

'

'

38.30%

'

41.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Interest in Partnership Unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

714,500,000

553,400,000

'

81,300,000

16,300,000

245,400,000

'

'

'

'

'

'

'

'

'

'

Partners' Capital Account, Contributions

15,000,000

11,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,700,000,000

'

'

'

'

'

Common units

19,800,000

'

'

19,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Class B units

73,000,000

'

'

73,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution per unit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.76

$0.72

$2.23

$2.15

'

'

'

'

'

'

'

'

'

'

'

'

$0.78

$0.73

$2.28

$2.16

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made To Member Or Limited Parter Annualized Quarterly Distribution

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made To Member Or Limited Parter Change From Prior Quarter

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.015

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General partner distributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,501,000

4,512,000

15,361,000

13,399,000

'

'

'

'

'

'

'

'

'

'

'

'

5,683,000

4,795,000

16,195,000

13,776,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distributions to general partner

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85,882,000

67,146,000

235,908,000

198,046,000

'

'

'

'

'

'

'

'

'

'

'

'

90,135,000

71,812,000

252,939,000

205,002,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive distributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

80,381,000

62,634,000

220,547,000

184,647,000

'

'

'

'

'

'

'

'

'

'

'

'

84,452,000

67,017,000

236,744,000

191,226,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited partner distributions to ONEOK

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

70,519,000

66,807,000

207,381,000

199,031,000

'

'

'

'

'

'

'

'

'

'

'

'

71,911,000

67,271,000

211,557,000

200,422,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited partner distributions to noncontrolling interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

118,644,000

91,676,000

324,805,000

272,904,000

'

'

'

'

'

'

'

'

'

'

'

'

122,105,000

100,650,000

345,255,000

283,365,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total distributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

275,045,000

225,629,000

768,094,000

669,981,000

'

'

'

'

'

'

'

'

'

'

'

'

284,151,000

239,733,000

809,751,000

688,789,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

81,324,000

53,526,000

255,298,000

'

'

'

'

'

'

Expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost of sales and fuel

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

9,562,000

10,835,000

27,855,000

'

'

'

'

'

'

Administrative and general expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

84,221,000

58,549,000

240,172,000

192,906,000

'

'

'

'

'

'

Total expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

84,221,000

68,111,000

251,007,000

220,761,000

'

'

'

'

'

'

Distribution Made to Limited Partner, Date of Record

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3-Nov-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Increase from Subsidiary Equity Issuance

73,263,000

501,893,000

'

877,658,000

516,201,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

138,310,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Partners capital account units sold under equity distribution agreement

1,400,000

'

300,000

4,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

305,000,000

152,000,000

153,000,000

Goodwill

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$92,000,000

'

'

'

SEGMENTS_Details

SEGMENTS (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Segment Reporting, Disclosure of Major Customers	'ONEOK Partners had no single customer from which it received 10 percent or more of consolidated revenues	'we had no single external customer from which we received 10 percent or more of our consolidated gross revenues	'we had no single external customer from which we received 10 percent or more of our consolidated gross revenues	'we had no single external customer from which we received 10 percent or more of our consolidated gross revenues	'
Total revenues	$3,120,145	$3,135,381	$9,350,323	$8,422,320	'
Net margin	536,941	424,222	1,543,048	1,208,087	'
Operating costs	172,495	131,001	493,628	397,901	'
Depreciation and amortization	74,588	61,850	214,129	176,016	'
Gain (loss) on sale of assets	1,534	21	1,533	341	'
Operating income	291,392	231,392	836,824	634,511	'
Equity earnings from investments	-52,347	27,468	6,747	79,744	'
Investments in unconsolidated affiliates	1,128,509	1,201,873	1,128,509	1,201,873	1,229,838
Total assets	14,312,196	17,610,343	14,312,196	17,610,343	17,741,481
Noncontrolling interests in consolidated subsidiaries	3,136,163	2,500,952	3,136,163	2,500,952	2,507,329
Capital expenditures	382,185	537,487	1,204,386	1,597,820	'
Natural Gas Gathering And Processing [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	777,802	533,017	2,263,292	1,452,790	'
Net margin	178,171	130,882	486,695	365,436	'
Operating costs	64,279	45,074	188,489	141,737	'
Depreciation and amortization	31,327	27,356	89,612	76,366	'
Gain (loss) on sale of assets	324	31	277	344	'
Operating income	82,889	58,483	208,871	147,677	'
Equity earnings from investments	-71,069	4,668	-60,484	16,228	'
Investments in unconsolidated affiliates	253,930	331,124	253,930	331,124	'
Total assets	4,415,814	3,808,135	4,415,814	3,808,135	'
Noncontrolling interests in consolidated subsidiaries	4,394	4,574	4,394	4,574	'
Capital expenditures	214,917	204,542	506,016	574,509	'
Natural Gas Liquids [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	2,734,520	2,874,848	8,111,642	7,630,631	'
Net margin	282,963	226,242	818,086	632,087	'
Operating costs	76,946	57,010	218,129	171,076	'
Depreciation and amortization	31,661	22,993	89,848	65,033	'
Gain (loss) on sale of assets	-535	7	-572	10	'
Operating income	173,821	146,246	509,537	395,988	'
Equity earnings from investments	4,351	6,336	13,574	15,383	'
Investments in unconsolidated affiliates	484,238	494,702	484,238	494,702	'
Total assets	7,337,688	6,610,205	7,337,688	6,610,205	'
Noncontrolling interests in consolidated subsidiaries	0	0	0	0	'
Capital expenditures	153,785	230,780	637,524	774,284	'
Natural Gas Liquids [Member] | Natural Gas Liquids for Regulated Segment [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	190,300	147,100	479,400	376,900	'
Net margin	94,300	89,500	263,400	227,800	'
Operating income	46,400	53,400	126,000	129,000	'
Natural Gas Pipelines [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	79,160	75,878	265,938	236,949	'
Net margin	73,399	69,457	242,359	211,224	'
Operating costs	27,998	23,457	82,747	75,608	'
Depreciation and amortization	10,913	10,833	32,623	32,687	'
Gain (loss) on sale of assets	1,746	-16	1,663	-12	'
Operating income	36,234	35,151	128,652	102,917	'
Equity earnings from investments	14,371	16,464	53,657	48,133	'
Investments in unconsolidated affiliates	390,341	376,047	390,341	376,047	'
Total assets	1,832,368	1,786,413	1,832,368	1,786,413	'
Noncontrolling interests in consolidated subsidiaries	0	0	0	0	'
Capital expenditures	10,650	11,148	25,987	22,497	'
Natural Gas Pipelines [Member] | Natural Gas Pipelines for Regulated Segment [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	65,200	57,500	214,800	182,000	'
Net margin	57,400	52,800	185,500	162,500	'
Operating income	23,400	22,600	84,600	67,000	'
Corporate Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	-471,337	-348,362	-1,290,549	-898,050	'
Net margin	2,408	-2,359	-4,092	-660	'
Operating costs	3,272	5,460	4,263	9,480	'
Depreciation and amortization	687	668	2,046	1,930	'
Gain (loss) on sale of assets	-1	-1	165	-1	'
Operating income	-1,552	-8,488	-10,236	-12,071	'
Equity earnings from investments	0	0	0	0	'
Investments in unconsolidated affiliates	0	0	0	0	'
Total assets	726,326	5,405,590	726,326	5,405,590	'
Noncontrolling interests in consolidated subsidiaries	3,131,769	2,496,378	3,131,769	2,496,378	'
Capital expenditures	2,833	91,017	34,859	226,530	'
Discontinued Operations [Member] | Corporate Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total assets	84,200	4,000,000	84,200	4,000,000	'
Capital expenditures	0	83,800	23,900	206,400	'
Sales to unaffiliated customers	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	3,120,145	3,054,057	9,296,797	8,167,022	'
Sales to unaffiliated customers | Natural Gas Gathering And Processing [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	374,403	162,677	1,095,531	466,631	'
Sales to unaffiliated customers | Natural Gas Liquids [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	2,667,939	2,840,108	7,950,930	7,539,470	'
Sales to unaffiliated customers | Natural Gas Pipelines [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	77,027	50,624	247,420	158,960	'
Sales to unaffiliated customers | Corporate Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	776	648	2,916	1,961	'
Sales to affiliated customers	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	'	81,324	53,526	255,298	'
Sales to affiliated customers | Natural Gas Gathering And Processing [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	'	57,400	41,214	179,636	'
Sales to affiliated customers | Natural Gas Liquids [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	'	0	0	0	'
Sales to affiliated customers | Natural Gas Pipelines [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	'	23,924	12,312	75,662	'
Sales to affiliated customers | Corporate Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	'	0	0	0	'
Intersegment revenues	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	0	0	0	0	'
Intersegment revenues | Natural Gas Gathering And Processing [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	403,399	312,940	1,126,547	806,523	'
Intersegment revenues | Natural Gas Liquids [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	66,581	34,740	160,712	91,161	'
Intersegment revenues | Natural Gas Liquids [Member] | Natural Gas Liquids for Regulated Segment [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	170,100	130,200	417,000	321,300	'
Intersegment revenues | Natural Gas Pipelines [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	2,133	1,330	6,206	2,327	'
Intersegment revenues | Corporate Elimination [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total revenues	($472,113)	($349,010)	($1,293,465)	($900,011)	'