10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2023.

OR

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from __________ to __________.

Commission file number   001-13643

ONEOK, Inc.

(Exact name of registrant as specified in its charter)

Oklahoma	73-1520922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

100 West Fifth Street,	Tulsa,	OK	74103
(Address of principal executive offices)			(Zip Code)

Registrant’s telephone number, including area code  (918) 588-7000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, par value of $0.01	OKE	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒  No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒  No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer ☒  Accelerated filer ☐  Non-accelerated filer ☐  Smaller reporting company ☐   Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

On October 23, 2023, the Company had 582,550,734 shares of common stock outstanding.

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2

ONEOK, Inc.

TABLE OF CONTENTS

Part I.	Financial Information	Page No.
Item 1.	Financial Statements (Unaudited)	6
	Consolidated Statements of Income - Three and Nine Months Ended September 30, 2023 and 2022	6
	Consolidated Statements of Comprehensive Income - Three and Nine Months Ended September 30, 2023 and 2022	7
	Consolidated Balance Sheets - September 30, 2023 and December 31, 2022	8
	Consolidated Statements of Cash Flows - Nine Months Ended September 30, 2023 and 2022	9
	Consolidated Statements of Changes in Equity - Three and Nine Months Ended September 30, 2023 and 2022	10
	Notes to Consolidated Financial Statements	12
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	47
Item 4.	Controls and Procedures	48
Part II.	Other Information	48
Item 1.	Legal Proceedings	48
Item 1A.	Risk Factors	49
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosures	51
Item 5.	Other Information	51
Item 6.	Exhibits	51
Signature		54

As used in this Quarterly Report, references to “we,” “our” or “us” refer to ONEOK, Inc., an Oklahoma corporation, and its predecessors and subsidiaries, unless the context indicates otherwise.

The statements in this Quarterly Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements. Forward-looking statements may include words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “guidance,” “intend,” “may,” “might,” “outlook,” “plan,” “potential,” “project,” “scheduled,” “should,” “target,” “will,” “would” and other words and terms of similar meaning. Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations or assumptions will be achieved. Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations “Forward-Looking Statements,” and Part II, Item 1A, “Risk Factors,” in this Quarterly Report and under Part I, Item 1A, “Risk Factors,” in our Annual Report.

INFORMATION AVAILABLE ON OUR WEBSITE

We make available, free of charge, on our website (www.oneok.com) copies of our Annual Reports, Quarterly Reports, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC. Copies of our Code of Business Conduct and Ethics, Corporate Governance Guidelines, Director Independence Guidelines, Corporate Sustainability Report and the written charters of our Board Committees also are available on our website, and we will provide copies of these documents upon request.

In addition to our filings with the SEC and materials posted on our website, we also use social media platforms as additional channels of distribution to reach public investors. Information contained on our website, posted on our social media accounts, and any corresponding applications, are not incorporated by reference into this report.

3

GLOSSARY

The abbreviations, acronyms and industry terminology used in this Quarterly Report are defined as follows:

$2.5 Billion Credit Agreement	ONEOK’s $2.5 billion amended and restated revolving credit agreement, as amended
AFUDC	Allowance for funds used during construction
Annual Report	Annual Report on Form 10-K for the year ended December 31, 2022
ASU	Accounting Standards Update
Bbl	Barrels, 1 barrel is equivalent to 42 United States gallons
BBtu/d	Billion British thermal units per day
Bcf	Billion cubic feet
BridgeTex	BridgeTex Pipeline Company, LLC, a 30% owned joint venture
CFTC	United States Commodity Futures Trading Commission
DJ	Denver-Julesburg
EBITDA	Earnings before interest expense, income taxes, depreciation and amortization
EPA	United States Environmental Protection Agency
EPS	Earnings per share of common stock
Exchange Act	Securities Exchange Act of 1934, as amended
FERC	Federal Energy Regulatory Commission
Fitch	Fitch Ratings, Inc.
GAAP	Accounting principles generally accepted in the United States of America
GHG	Greenhouse gas
Guardian	Guardian Pipeline, L.L.C., a wholly owned subsidiary of ONEOK, Inc.
Guardian Term Loan Agreement	Guardian’s senior unsecured three-year $120 million term loan agreement dated June 2022
Homeland Security	United States Department of Homeland Security
HoustonLink	HoustonLink Pipeline Company, LLC, a 50% owned joint venture
Intermediate Partnership	ONEOK Partners Intermediate Limited Partnership, a wholly owned subsidiary of ONEOK Partners, L.P.
Magellan	Magellan Midstream Partners, L.P., a wholly owned subsidiary of ONEOK, Inc.
Magellan Acquisition	The transaction completed on September 25, 2023, pursuant to which ONEOK acquired all of Magellan’s outstanding common units in a cash-and-stock transaction, pursuant to the Merger Agreement
MBbl/d	Thousand barrels per day
MDth/d	Thousand dekatherms per day
Merger Agreement	Agreement and Plan of Merger of ONEOK, Otter Merger Sub, LLC and Magellan, dated May 14, 2023
MMBbl	Million barrels
MMBtu	Million British thermal units
MMcf/d	Million cubic feet per day
Moody’s	Moody’s Investors Service, Inc.
MVP	MVP Terminalling, LLC, a 25% owned joint venture
Natural Gas Act	Natural Gas Act of 1938, as amended
NGL(s)	Natural gas liquid(s)
Northern Border	Northern Border Pipeline Company, a 50% owned joint venture
NYMEX	New York Mercantile Exchange
ONEOK	ONEOK, Inc.
ONEOK Partners	ONEOK Partners, L.P., a wholly owned subsidiary of ONEOK, Inc.
OPIS	Oil Price Information Service
Overland Pass	Overland Pass Pipeline Company, LLC, a 50% owned joint venture

4

PHMSA	United States Department of Transportation Pipeline and Hazardous Materials Safety Administration
POP	Percent of Proceeds
Powder Springs	Powder Springs Logistics, LLC, a 50% owned joint venture
Purity NGLs	Marketable natural gas liquid purity products, such as ethane, ethane/propane mix, propane, iso-butane, normal butane and natural gasoline
Quarterly Report(s)	Quarterly Report(s) on Form 10-Q
RINs	Renewable Identification Numbers, which represent credits required for renewable fuel standard compliance
Refined Products	The output from crude oil refineries, including products such as gasoline, diesel fuel, aviation fuel, kerosene and heating oil
Roadrunner	Roadrunner Gas Transmission, LLC, a 50% owned joint venture
S&P	S&P Global Ratings
Saddlehorn	Saddlehorn Pipeline Company, LLC, a 30% owned joint venture
Seabrook	Seabrook Logistics, LLC, a 50% owned joint venture
SEC	Securities and Exchange Commission
Series E Preferred Stock	Series E Non-Voting, Perpetual Preferred Stock, par value $0.01 per share
Term SOFR	The forward-looking term rate based on Secured Overnight Financing Rate (SOFR)
Texas Frontera	Texas Frontera, LLC, a 50% owned joint venture
Viking	Viking Gas Transmission Company, a wholly owned subsidiary of ONEOK, Inc.
Viking Term Loan Agreement	Viking’s senior unsecured three-year $60 million term loan agreement dated March 2023
WTI	West Texas Intermediate
XBRL	eXtensible Business Reporting Language

5

PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF INCOME
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Unaudited)	2023		2022		2023		2022
	(Millions of dollars, except per share amounts)
Revenues
Commodity sales	$	3,760	$	5,564	$	11,287	$	16,320
Services	429		350		1,155		1,035
Total revenues (Note L)	4,189		5,914		12,442		17,355
Cost of sales and fuel (exclusive of items shown separately below)	2,799		4,773		8,628		14,017
Operations and maintenance	308		238		833		683
Depreciation and amortization	177		157		509		469
General taxes	44		48		148		144
Transaction costs (Note B)	123		—		133		—
Other operating (income) expense, net (Note C)	(1)		(2)		(782)		(9)
Operating income	739		700		2,973		2,051
Equity in net earnings from investments (Note J)	49		39		132		111
Other income (expense), net	22		(8)		43		(30)
Interest expense (net of capitalized interest of $8, $17, $32, and $42, respectively)	(215)		(167)		(561)		(510)
Income before income taxes	595		564		2,587		1,622
Income taxes	(141)		(132)		(616)		(385)
Net income	454		432		1,971		1,237
Less: Preferred stock dividends	1		1		1		1
Net income available to common shareholders	$	453	$	431	$	1,970	$	1,236
Basic EPS (Note I)	$	0.99	$	0.96	$	4.37	$	2.76
Diluted EPS (Note I)	$	0.99	$	0.96	$	4.36	$	2.76
Average shares (millions)
Basic	457.3		447.7		451.2		447.4
Diluted	458.2		448.2		452.1		448.3

See accompanying Notes to Consolidated Financial Statements.

6

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Unaudited)	2023		2022		2023		2022
	(Millions of dollars)
Net income	$	454	$	432	$	1,971	$	1,237
Other comprehensive income (loss), net of tax
Change in fair value of derivatives, net of tax of $(3), $(31), $(25) and $(17), respectively	12		107		86		57
Derivative amounts reclassified to net income, net of tax of $4, $(16), $14 and $(57), respectively	(7)		54		(44)		190
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1), $(1), $(1) and $(3), respectively	2		3		3		9
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $—, $(1), $1 and $(5), respectively	—		3		(5)		16
Total other comprehensive income, net of tax	7		167		40		272
Comprehensive income	$	461	$	599	$	2,011	$	1,509

See accompanying Notes to Consolidated Financial Statements.

7

ONEOK, Inc. and Subsidiaries
CONSOLIDATED BALANCE SHEETS
		September 30,		December 31,
(Unaudited)		2023		2022
Assets	(Millions of dollars)
Current assets
Cash and cash equivalents		$	284	$	220
Accounts receivable, net		1,571		1,532
Materials and supplies		142		149
Inventories		869		432
Commodity imbalances		22		43
Other current assets		300		172
Total current assets		3,188		2,548
Property, plant and equipment
Property, plant and equipment		37,626		25,015
Accumulated depreciation and amortization		5,537		5,063
Net property, plant and equipment		32,089		19,952
Other assets
Investments in unconsolidated affiliates		1,795		802
Goodwill		5,682		528
Intangible assets, net		861		225
Other assets		324		324
Total other assets		8,662		1,879
Total assets		$	43,939	$	24,379
Liabilities and equity
Current liabilities
Current maturities of long-term debt (Note F)		$	500	$	925
Accounts payable		1,619		1,359
Commodity imbalances		248		254
Accrued taxes		220		136
Accrued interest		218		233
Operating lease liability		32		12
Other current liabilities		461		132
Total current liabilities		3,298		3,051
Long-term debt, excluding current maturities (Note F)		21,450		12,696
Deferred credits and other liabilities
Deferred income taxes		2,349		1,739
Operating lease liability		77		68
Other deferred credits		466		331
Total deferred credits and other liabilities		2,892		2,138
Commitments and contingencies (Note K)
Equity (Note G)
Preferred stock, $0.01 par value: authorized and issued 20,000 shares at September 30, 2023, and December 31, 2022		—		—
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 609,713,834 shares and outstanding 582,536,892 shares at September 30, 2023; issued 474,916,234 shares and outstanding   447,157,771 shares at December 31, 2022		6		5
Paid-in capital		16,315		7,253
Accumulated other comprehensive loss (Note H)		(68)		(108)
Retained earnings		737		50
Treasury stock, at cost: 27,176,942 shares at September 30, 2023, and 27,758,463 shares at   December 31, 2022		(691)		(706)
Total equity		16,299		6,494
Total liabilities and equity		$	43,939	$	24,379

See accompanying Notes to Consolidated Financial Statements.

8

    

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CASH FLOWS
	Nine Months Ended
	September 30,
(Unaudited)	2023		2022
	(Millions of dollars)
Operating activities
Net income	$	1,971	$	1,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	509		469
Equity in net earnings from investments	(132)		(111)
Distributions received from unconsolidated affiliates	134		110
Deferred income taxes	599		345
Medford settlement gain	(779)		—
Medford settlement proceeds	502		—
Other, net	79		46
Changes in assets and liabilities:
Accounts receivable	153		(260)
Inventories, net of commodity imbalances	(104)		(165)
Accounts payable	38		296
Other assets and liabilities, net	(57)		(101)
Cash provided by operating activities	2,913		1,866
Investing activities
Capital expenditures (less allowance for equity funds used during construction)	(992)		(886)
Cash paid for Magellan Acquisition, net of cash acquired	(5,008)		—
Contributions to unconsolidated affiliates	(111)		(2)
Distributions received from unconsolidated affiliates in excess of cumulative earnings	18		18
Medford settlement proceeds	328		—
Other, net	6		6
Cash used in investing activities	(5,759)		(864)
Financing activities
Dividends paid	(1,283)		(1,253)
Short-term borrowings, net	—		901
Issuance of long-term debt, net of discounts	5,298		120
Debt financing costs	(71)		(1)
Repayment of long-term debt	(1,040)		(896)
Other, net	6		3
Cash provided by (used in) financing activities	2,910		(1,126)
Change in cash and cash equivalents	64		(124)
Cash and cash equivalents at beginning of period	220		146
Cash and cash equivalents at end of period	$	284	$	22

See accompanying Notes to Consolidated Financial Statements.

9

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
(Unaudited)	Preferred Stock Issued	Common Stock Issued	Preferred Stock		Common Stock		Paid-in Capital
	(Shares)		(Millions of dollars)
January 1, 2023	20,000	474,916,234	$	—	$	5	$	7,253
Net income	—	—	—		—		—
Other comprehensive income (Note H)	—	—	—		—		—
Preferred stock dividends - $13.75 per share (Note G)	—	—	—		—		—
Common stock issued	—	—	—		—		(3)
Common stock dividends - $0.955 per share (Note G)	—	—	—		—		—
Other, net	—	—	—		—		3
March 31, 2023	20,000	474,916,234	—		5		7,253
Net income	—	—	—		—		—
Other comprehensive income (Note H)	—	—	—		—		—
Preferred stock dividends - $13.75 per share (Note G)	—	—	—		—		—
Common stock issued	—	—	—		—		7
Common stock dividends - $0.955 per share (Note G)	—	—	—		—		—
Other, net	—	—	—		—		10
June 30, 2023	20,000	474,916,234	—		5		7,270
Net income	—	—	—		—		—
Other comprehensive income (Note H)	—	—	—		—		—
Preferred stock dividends - $13.75 per share (Note G)	—	—	—		—		—
Magellan Acquisition consideration	—	134,797,600	—		1		9,061
Common stock issued	—	—	—		—		3
Common stock dividends - $0.955 per share (Note G)	—	—	—		—		—
Other, net	—	—	—		—		(19)
September 30, 2023	20,000	609,713,834	$	—	$	6	$	16,315

January 1, 2022	20,000	474,916,234	$	—	$	5	$	7,214
Net income	—	—	—		—		—
Other comprehensive income	—	—	—		—		—
Preferred stock dividends - $13.75 per share	—	—	—		—		—
Common stock issued	—	—	—		—		(6)
Common stock dividends - $0.935 per share	—	—	—		—		(26)
Other, net	—	—	—		—		(5)
March 31, 2022	20,000	474,916,234	—		5		7,177
Net income	—	—	—		—		—
Other comprehensive income	—	—	—		—		—
Preferred stock dividends - $13.75 per share	—	—	—		—		—
Common stock issued	—	—	—		—		7
Common stock dividends - $0.935 per share	—	—	—		—		(4)
Other, net	—	—	—		—		10
June 30, 2022	20,000	474,916,234	—		5		7,190
Net income	—	—	—		—		—
Other comprehensive income	—	—	—		—		—
Preferred stock dividends - $13.75 per share	—	—	—		—		—
Common stock issued	—	—	—		—		4
Common stock dividends - $0.935 per share	—	—	—		—		13
Other, net	—	—	—		—		11
September 30, 2022	20,000	474,916,234	$	—	$	5	$	7,218

10

ONEOK, Inc. and Subsidiaries
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
(Continued)
(Unaudited)	Accumulated Other Comprehensive Loss		Retained Earnings		Treasury Stock		Total Equity
	(Millions of dollars)
January 1, 2023	$	(108)	$	50	$	(706)	$	6,494
Net income	—		1,049		—		1,049
Other comprehensive income (Note H)	9		—		—		9
Preferred stock dividends - $13.75 per share (Note G)	—		—		—		—
Common stock issued	—		—		7		4
Common stock dividends - $0.955 per share (Note G)	—		(427)		—		(427)
Other, net	—		—		—		3
March 31, 2023	(99)		672		(699)		7,132
Net income	—		468		—		468
Other comprehensive income (Note H)	24		—		—		24
Preferred stock dividends - $13.75 per share (Note G)	—		—		—		—
Common stock issued	—		—		6		13
Common stock dividends - $0.955 per share (Note G)	—		(429)		—		(429)
Other, net	—		—		—		10
June 30, 2023	(75)		711		(693)		7,218
Net income	—		454		—		454
Other comprehensive income (Note H)	7		—		—		7
Preferred stock dividends - $13.75 per share (Note G)	—		(1)		—		(1)
Magellan Acquisition consideration	—		—		—		9,062
Common stock issued	—		—		2		5
Common stock dividends - $0.955 per share (Note G)	—		(427)		—		(427)
Other, net	—		—		—		(19)
September 30, 2023	$	(68)	$	737	$	(691)	$	16,299

January 1, 2022	$	(472)	$	—	$	(732)	$	6,015
Net income	—		391		—		391
Other comprehensive income	4		—		—		4
Preferred stock dividends - $13.75 per share	—		—		—		—
Common stock issued	—		—		12		6
Common stock dividends - $0.935 per share	—		(391)		—		(417)
Other, net	—		—		—		(5)
March 31, 2022	(468)		—		(720)		5,994
Net income	—		414		—		414
Other comprehensive income	101		—		—		101
Preferred stock dividends - $13.75 per share	—		—		—		—
Common stock issued	—		—		7		14
Common stock dividends - $0.935 per share	—		(414)		—		(418)
Other, net	—		—		—		10
June 30, 2022	(367)		—		(713)		6,115
Net income	—		432		—		432
Other comprehensive income	167		—		—		167
Preferred stock dividends - $13.75 per share	—		(1)		—		(1)
Common stock issued	—		—		2		6
Common stock dividends - $0.935 per share	—		(431)		—		(418)
Other, net	—		—		—		11
September 30, 2022	$	(200)	$	—	$	(711)	$	6,312

See accompanying Notes to Consolidated Financial Statements.

11

ONEOK, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 statement of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2022 year-end Consolidated Balance Sheet data was derived from our audited Consolidated Financial Statements but does not include all disclosures required by GAAP. Certain reclassifications have been made in the prior year Consolidated Financial Statements to conform to the current year presentation. These unaudited Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements in our Annual Report.

Goodwill Impairment Review - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. At July 1, 2023, we assessed qualitative factors to determine whether it was more likely than not that the fair value of each of our reporting units with goodwill was less than its carrying amount. After assessing qualitative factors (including macroeconomic conditions, industry and market considerations, costs and overall financial performance), we determined that it was more likely than not that the fair value of the Natural Gas Pipelines and Natural Gas Liquids reporting units were not less than their respective carrying value, that no further testing was necessary and that goodwill was not considered impaired.

Recently Issued Accounting Standards Update - Changes to GAAP are established by the Financial Accounting Standards Board (FASB) in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. ASUs not discussed herein or in our Annual Report were assessed and determined to be either not applicable or clarifications of ASUs previously issued. There have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us.

B.    MAGELLAN ACQUISITION

On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. The acquisition strategically diversifies our complementary asset base and allows for significant expected synergies as a combined entity. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash, for a total consideration of $14.1 billion. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition. We funded the cash portion of the acquisition with an underwritten public offering of $5.25 billion senior unsecured notes. In connection with the underwritten public offering, we terminated the undrawn commitment letter for the $5.25 billion unsecured 364-day bridge loan facility. For additional information on our long-term debt, see Note F.

Magellan’s operations are principally composed of transportation, storage and distribution of Refined Products, certain NGLs and crude oil. The assets acquired consist of an approximately 9,800-mile Refined Products pipeline system with 54 terminals, including one marine storage terminal, and crude oil infrastructure with approximately 1,000 miles of pipelines, one condensate splitter and three storage terminals. We also acquired ownership interests in Magellan’s eight unconsolidated affiliates. In conjunction with the Magellan Acquisition, Magellan’s results of operations will be reported within our new Refined Products and Crude segment, consistent with how information is presented to our chief operating decision maker.

The Magellan Acquisition was accounted for using the acquisition method of accounting for business combinations pursuant to Accounting Standards Codification 805, “Business Combinations,” which requires, among other things, assets acquired and liabilities assumed to be recorded at their fair values on the acquisition date. Determining the fair value of acquired assets and liabilities assumed requires management’s judgment and the use of independent valuation specialists. The purchase price allocation presented below is preliminary, as certain data necessary to complete the purchase price allocation is not yet available, including, but not limited to, the final valuation of assets acquired and liabilities assumed. Management is also evaluating certain assumptions of assets acquired and liabilities assumed and may adjust the allocation in subsequent periods. The final valuation will be completed no later than one year from the acquisition date.

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The following tables set forth the acquisition consideration and preliminary purchase price allocation of assets acquired and liabilities assumed:

	At September 25, 2023
	(Millions of dollars and shares/units, except per share/unit data)
Magellan public common units outstanding	202.1
Cash consideration per Magellan unit	$25.00
Cash consideration	$	5,052
Magellan public common units outstanding	202.1
ONEOK exchange ratio per Magellan unit	0.667
Shares of ONEOK common stock issued	134.8
ONEOK common stock closing price on September 25, 2023	$66.54
Fair value of common stock issued	$	8,969
Fair value of Magellan replacement equity awards	93
Equity consideration	$	9,062
Total consideration	$	14,114

	At September 25, 2023
Assets acquired:	(Millions of dollars)
Cash and cash equivalents	$	44
Accounts receivables, net	245
Inventories	348
Other current assets	65
Property, plant and equipment	11,562
Investments in unconsolidated affiliates	909
Intangible assets	645
Other assets	112
Total assets acquired	13,930
Liabilities assumed:
Accounts payable	221
Other current liabilities	533
Long-term debt, excluding current maturities	4,013
Other deferred credits and liabilities	203
Total liabilities assumed	4,970
Total identifiable net assets	8,960
Goodwill	5,154
Total purchase price	$	14,114

Property, plant and equipment:

Property, plant and equipment consists primarily of pipeline, pipeline-related equipment, storage tanks and processing equipment and will be depreciated on a straight-line basis over the estimated useful lives of the assets.

Intangible assets:

The preliminary value of net identifiable intangible assets relates to contract-based customer relationships that will be amortized over the period of expected benefit.

Long-term debt, excluding current maturities:

We assumed the outstanding debt of Magellan and utilized publicly traded prices to estimate the fair value. The debt comprises senior unsecured obligations with varying maturities and interest rates as outlined in Note F. Recognizing the debt at its acquisition date fair value resulted in a discount from the notional value. The discount will be amortized into interest expense over the remaining life of the debt.

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Other deferred credits and liabilities:

Magellan’s pension and postretirement benefit net liabilities of $71 million were assumed in conjunction with the Magellan Acquisition. These defined benefit plans are composed of two pension plans, including one for non-union employees and one for union employees, as well as a postretirement welfare benefit plan for certain employees.

Goodwill:

The following table sets forth the amounts of goodwill by segment for the periods indicated:

	Natural Gas Gathering and Processing		Natural Gas Liquids		Natural Gas Pipelines		Refined Products and Crude		Total
	(Millions of dollars)
Gross goodwill	$	153	$	371	$	157	$	—	$	681
Accumulated impairment losses	(153)		—		—		—		(153)
December 31, 2022	—		371		157		—		528
Acquisitions (a)	—		—		—		5,154		5,154
September 30, 2023	$	—	$	371	$	157	$	5,154	$	5,682

(a) - Goodwill from the Magellan Acquisition primarily represents expected commercial and cost synergies and is expected to be fully deductible for tax purposes. Allocation is preliminary and may be updated as we continue to evaluate the benefits of expected commercial and cost synergies to reporting units.

Results of Operations

The results of operations attributable to the Magellan Acquisition have been included in our Consolidated Financial Statements since the date of the acquisition through September 30, 2023. Revenue and net income attributable to the assets acquired for the period September 25, 2023, through September 30, 2023, were $72 million and $29 million, respectively.

For the nine months ended September 30, 2023, we recognized approximately $154 million of transaction costs associated with the Magellan Acquisition, as outlined in the table below. These non-recurring costs are primarily related to advisory fees, severance and settlement of share-based awards for certain Magellan employees, as well as bridge facility commitment fees. The following table sets forth the impact of acquisition related transaction costs in our Consolidated Statements of Income as of the periods indicated:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2023		2023
	(Millions of dollars)
Transaction costs	$	123	$	133
Interest expense	13		21
Total	$	136	$	154

Pro Forma Financial Information

The following table sets forth the unaudited supplemental pro forma financial information for the three and nine months ended September 30, 2023 and 2022, as if we had completed the Magellan Acquisition on January 1, 2022:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Revenue	$	4,850	$	6,723	$	14,764	$	19,548
Net income	$	572	$	596	$	2,364	$	1,336

The summarized unaudited pro forma information reflects the following adjustments:

•Reflects depreciation and amortization based on the preliminary fair values of property, plant and equipment, and intangible assets;

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•Reflects $136 million and $154 million of non-recurring transaction costs incurred for the three and nine months ended September 30, 2023, respectively, that were reclassified and included in pro forma net income for the nine months ended September 30, 2022, as if they had been incurred on January 1, 2022;

•Reflects interest expense related to the underwritten public offering of $5.25 billion senior unsecured notes used to fund the cash consideration and other costs related to the Magellan Acquisition;

•Reflects the amortization of the debt discount to fair value of the Magellan long-term debt assumed;

•Reflects the amortization of excess fair value of the replacement share-based awards;

•Reflects the income tax effect of the pro forma adjustments; and

•Excludes the impact of historical activity between ONEOK and Magellan.

The unaudited pro forma financial information for the nine months ended September 30, 2023, includes a one-time operational gain of $779 million related to insurance proceeds on the Medford incident. The unaudited pro forma financial information is presented for informational purposes only and is not necessarily indicative of our operating results that would have occurred had the transaction been completed at the beginning of the period presented, nor is it necessarily indicative of future results.

C.    MEDFORD INCIDENT

On July 9, 2022, a fire occurred at our 210 MBbl/d Medford, Oklahoma, natural gas liquids fractionation facility. Beginning in August 2022, we developed claims related to the Medford incident and recorded accruals for the expected insurance recoveries. We assessed incurred costs and lost earnings related to business interruption and property damage to our facility, as well as timing of recognition under applicable insurance recovery guidance, and recorded accruals of $151 million in 2022 for insurance recoveries that offset our incurred costs and losses.

On January 9, 2023, we reached an agreement with our insurers to settle all claims for physical damage and business interruption related to the Medford incident. Under the terms of the settlement agreement, we agreed to resolve the claims for total insurance payments of $930 million, $100 million of which was received in 2022. The remaining $830 million was received in the first quarter 2023. The proceeds serve as settlement for property damage, business interruption claims to the date of the settlement and as payment in lieu of future business interruption insurance claims.

In the first quarter 2023, we applied the $830 million received to our outstanding insurance receivable at December 31, 2022, of $51 million, and recorded an operational gain for the remaining $779 million in other operating (income) expense, net, within the Consolidated Statement of Income. We classified proceeds received within the Consolidated Statement of Cash Flows based on our assessment of the nature of the loss (property and business interruption) included in the settlement.

D.    FAIR VALUE MEASUREMENTS

Determining Fair Value - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date. Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety. Our valuation techniques and inputs are consistent with those discussed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.

Magellan Acquisition - Included in our commodity derivative contracts are exchange-traded, exchange cleared and over-the-counter derivative contracts related to Refined Products, certain NGLs and crude oil. The exchange-traded contracts are valued based on quoted prices in active markets and are classified within Level 1 of our fair value hierarchy. The exchange cleared and over-the-counter derivatives are valued based on significant observable pricing inputs including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence and are classified within Level 2 of our fair value hierarchy.

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Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements as of the dates indicated:

	September 30, 2023
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	49	$	67	$	—	$	116	$	(81)	$	35
Total derivative assets	$	49	$	67	$	—	$	116	$	(81)	$	35
Derivative liabilities
Commodity contracts	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)
Total derivative liabilities	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At September 30, 2023, we held no cash and posted cash of $43 million with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2022
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	15	$	152	$	—	$	167	$	(125)	$	42
Interest-rate contracts	—		11		—		11		—		11
Total derivative assets	$	15	$	163	$	—	$	178	$	(125)	$	53
Derivative liabilities
Commodity contracts	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—
Total derivative liabilities	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2022, we held no cash and posted $9 million of cash with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Derivative Assets (Liabilities)	2023		2022		2023		2022
	(Millions of dollars)
Net liabilities at beginning of period	$	—	$	(110)	$	—	$	(114)
Total changes in fair value:
Settlements included in net income (a)	—		39		—		79
New Level 3 derivatives included in other comprehensive income (b)	—		—		—		73
Unrealized change included in other comprehensive income (b)	—		122		—		13
Net assets at end of period	$	—	$	51	$	—	$	51

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

During the year ended December 31, 2022, we transferred out of Level 3 commodity derivatives associated with certain locations for NGL basis swaps, principally due to improved transparency of market prices as a result of the volume and frequency of transactions in these markets. We consider the valuation of these commodity derivatives, which are transacted through a clearing broker and valued with an unadjusted published price from an exchange, as a Level 2 valuation.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings is equal to book value due to the short-term nature of these items. Our cash and cash equivalents are composed of bank and money market accounts and are classified as Level 1. Our short-term borrowings are classified as Level 2 since the estimated fair value of the short-term borrowings can be determined using information available in the commercial paper market. We have investments associated with our supplemental executive retirement plan and nonqualified

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deferred compensation plan that are carried at fair value and primarily are composed of mutual funds, municipal bonds and other fixed income securities classified as Level 1 and Level 2.

The estimated fair value of our consolidated long-term debt, including current maturities, was $19.8 billion and $12.7 billion at September 30, 2023, and December 31, 2022, respectively. The book value of our consolidated long-term debt, including current maturities, was $22.0 billion and $13.6 billion at September 30, 2023, and December 31, 2022, respectively. The estimated fair value of the aggregate 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.

E.    RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Risk-management Activities - We are sensitive to changes in natural gas, NGLs and crude oil prices, principally as a result of contractual terms under which these commodities are processed, purchased and sold. As a result of the Magellan Acquisition, we are also sensitive to changes in Refined Product prices. We are also subject to the risk of interest-rate fluctuation in the normal course of business. We use physical-forward purchases and sales and financial derivatives to secure a certain price for a portion of our natural gas, NGLs, Refined Products, condensate and crude oil purchases and sales; to reduce our exposure to commodity price and interest-rate fluctuations; and to achieve more predictable cash flows. We follow established policies and procedures to assess risk and approve, monitor and report our risk-management activities. We have not used these instruments for trading purposes.

Commodity price risk - Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs, Refined Products, condensate and crude oil. We may use commodity derivative instruments to reduce the near-term commodity price risk associated with a portion of our forecasted purchases and sales of commodities.

In our Refined Products and Crude segment, we implemented effective hedging strategies for a substantial portion of the segment’s commodity derivative financial instruments that qualify as cash flow hedges for accounting purposes. Changes in the fair value of commodity derivative instruments not designated as a hedge were immaterial for the period September 25, 2023, through September 30, 2023, and are recorded currently in earnings.

Interest-rate risk - We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt, Treasury locks and interest-rate swaps. Treasury locks are agreements to pay the difference between the benchmark Treasury rate and the rate that is designated in the terms of the agreement. In the second quarter 2023, we entered into $1.1 billion of Treasury locks to hedge the variability of interest payments on a portion of our forecasted debt issuances. In the third quarter 2023, we settled all of our $1.1 billion Treasury locks related to our underwritten public offering of $5.25 billion senior unsecured notes associated with the Magellan Acquisition resulting in a gain of $43 million, which is included in accumulated other comprehensive loss and amortized into interest expense over the term of the related debt. All of our Treasury locks were designated as cash flow hedges.

Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts. In the third quarter 2023, we settled all of our $0.4 billion forward-starting interest-rate swaps related to our underwritten public offerings of $5.25 billion senior unsecured notes associated with the Magellan Acquisition resulting in a gain of $44 million, which is included in accumulated other comprehensive loss and amortized into interest expense over the term of the related debt. All of our interest-rate swaps were designated as cash flow hedges.

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Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments presented on a gross basis as of the dates indicated:

		September 30, 2023				December 31, 2022
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
Derivatives designated as hedging instruments		(Millions of dollars)
Commodity contracts (a)	Other current assets	$	104	$	(79)	$	160	$	(123)
	Other assets	—		—		6		(1)
Interest-rate contracts	Other current assets	—		—		11		—
Total derivatives designated as hedging instruments		104		(79)		177		(124)
Derivatives not designated as hedging instruments
Commodity contracts (a)	Other current assets/liabilities	12		(5)		1		(1)
Total derivatives not designated as hedging instruments		12		(5)		1		(1)
Total derivatives		$	116	$	(84)	$	178	$	(125)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held as of the dates indicated:

		September 30, 2023		December 31, 2022
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments:
Cash flow hedges
Fixed price
- Natural gas (Bcf)	Futures	(18.8)		(39.3)
- Refined Products, crude oil and NGLs (MMBbl)	Futures	(13.8)		(8.4)
Basis
- Natural gas (Bcf)	Futures	(19.4)		(39.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	—	$	0.4
Derivatives not designated as hedging instruments:
Fixed price
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(1.9)		0.1
Basis
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(0.1)		—

Cash Flow Hedges - The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Commodity contracts	$	(37)	$	69	$	57	$	(139)
Interest-rate contracts	52		69		54		213
Total unrealized change in fair value of cash flow hedges in other comprehensive income	$	15	$	138	$	111	$	74

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The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2023		2022		2023		2022
		(Millions of dollars)
Commodity contracts	Commodity sales revenues	$	31	$	(78)	$	149	$	(546)
	Cost of sales and fuel	(15)		18		(75)		328
Interest-rate contracts	Interest expense	(5)		(10)		(16)		(29)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	11	$	(70)	$	58	$	(247)

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize credit risk. Our policies and related credit risk are consistent with those discussed in our Annual Report.

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F.    DEBT

The following table sets forth our consolidated debt as of the dates indicated:

	September 30, 2023		December 31, 2022
	(Millions of dollars)
Commercial paper outstanding (a)	$	—	$	—
Senior unsecured obligations:
$425 at 5.0% due September 2023	—		425
$500 at 7.5% due September 2023	—		500
$500 at 2.75% due September 2024	500		500
$250 at 3.2% due March 2025 (b)	250		—
$500 at 4.9% due March 2025	500		500
$400 at 2.2% due September 2025	387		387
$600 at 5.85% due January 2026	600		600
$650 at 5.0% due March 2026 (b)	650		—
$750 at 5.55% due November 2026	750		—
$500 at 4.0% due July 2027	500		500
$800 at 4.55% due July 2028	800		800
$100 at 6.875% due September 2028	100		100
$750 at 5.65% due November 2028	750		—
$700 at 4.35% due March 2029	700		700
$750 at 3.4% due September 2029	714		714
$850 at 3.1% due March 2030	780		780
$500 at 3.25% due June 2030 (b)	500		—
$500 at 5.8% due November 2030	500		—
$600 at 6.35% due January 2031	600		600
$750 at 6.1% due November 2032	750		750
$1,500 at 6.05% due September 2033	1,500		—
$400 at 6.0% due June 2035	400		400
$600 at 6.65% due October 2036	600		600
$250 at 6.4% due May 2037 (b)	250		—
$600 at 6.85% due October 2037	600		600
$650 at 6.125% due February 2041	650		650
$250 at 4.2% due December 2042 (b)	250		—
$400 at 6.2% due September 2043	400		400
$550 at 5.15% due October 2043 (b)	550		—
$250 at 4.2% due March 2045 (b)	250		—
$500 at 4.25% due September 2046 (b)	500		—
$700 at 4.95% due July 2047	689		689
$500 at 4.2% due October 2047 (b)	500		—
$1,000 at 5.2% due July 2048	1,000		1,000
$500 at 4.85% due February 2049 (b)	500		—
$750 at 4.45% due September 2049	653		673
$500 at 4.5% due March 2050	443		443
$800 at 3.95% due March 2050 (b)	800		—
$300 at 7.15% due January 2051	300		300
$1,750 at 6.625% due September 2053	1,750		—
Guardian $120 term loan, rate of 6.54% as of September 30, 2023, due June 2025	120		120
Viking $60 term loan, rate of 6.67% as of September 30, 2023, due March 2026	60		—
Total debt	23,096		13,731
Unamortized debt discounts	(1,029)		(35)
Unamortized debt issuance costs and terminated swaps	(117)		(75)
Current maturities of long-term debt	(500)		(925)
Long-term debt	$	21,450	$	12,696

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

(b) - Debt assumed in the Magellan Acquisition. Amounts are presented at face value with discount to fair value included in unamortized debt discounts.

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$2.5 Billion Credit Agreement - Our $2.5 Billion Credit Agreement, which expires in 2027, is a revolving credit facility and contains certain customary conditions for borrowing, as well as customary financial, affirmative and negative covenants. Among other things, these covenants include maintaining a ratio of consolidated net indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects). In addition, adjusted EBITDA as defined in our $2.5 Billion Credit Agreement allows inclusion of the trailing twelve months of consolidated adjusted EBITDA of the acquired business. In the third quarter 2023, we completed the Magellan Acquisition, which allowed us to elect an acquisition adjustment period under our $2.5 Billion Credit Agreement and, as a result, increased our leverage ratio covenant to 5.5 to 1 for the third quarter 2023 and the two following quarters. Thereafter, the covenant will decrease to 5.0 to 1. At September 30, 2023, we had no outstanding borrowings, our ratio of indebtedness to adjusted EBITDA was 3.7 to 1 and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.

Debt Issuances - In August 2023, we completed an underwritten public offering of $5.25 billion senior unsecured notes consisting of $750 million, 5.55% senior notes due 2026; $750 million, 5.65% senior notes due 2028; $500 million, 5.80% senior notes due 2030; $1.5 billion, 6.05% senior notes due 2033; and $1.75 billion, 6.625% senior notes due 2053. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $5.2 billion. The net proceeds were used to fund the cash consideration and other costs related to the Magellan Acquisition.

Debt Repayments - In June 2023, we redeemed our $500 million, 7.5% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

In February 2023, we redeemed our $425 million, 5.0% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

Debt Guarantees - ONEOK, ONEOK Partners, Magellan and the Intermediate Partnership have cross guarantees in place for ONEOK’s, ONEOK Partners’ and Magellan’s indebtedness. The Guardian Term Loan Agreement and Viking Term Loan Agreement are not guaranteed by ONEOK, ONEOK Partners, Magellan or the Intermediate Partnership.

Viking Term Loan Agreement - In March 2023, Viking entered into a $60 million senior unsecured Term Loan Agreement, which is fully drawn. The proceeds were used to repay intercompany debt with ONEOK and for general corporate purposes. The Viking Term Loan Agreement matures in March 2026 and bears interest at Term SOFR plus an applicable margin. As of September 30, 2023, Viking was in compliance with all covenants under the Viking Term Loan Agreement.

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G.    EQUITY

Equity Issuances - On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition.

Dividends - Holders of our common stock share equally in any dividend declared by our Board of Directors, subject to the rights of the holders of outstanding Series E Preferred Stock. Dividends paid on our common stock in February 2023, May 2023 and August 2023 were $0.955 per share. A common stock dividend of $0.955 per share was declared for shareholders of record at the close of business on November 1, 2023, payable November 14, 2023.

Our Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when and if, declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $0.3 million in February 2023, May 2023 and August 2023. Dividends totaling $0.3 million were declared for the Series E Preferred Stock and are payable November 14, 2023.

H.    ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table sets forth the balance in accumulated other comprehensive loss for the period indicated, net of tax:

	Risk- Management Assets/Liabilities		Retirement and Other Postretirement Benefit Plan Obligations (a)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates		Accumulated Other Comprehensive Loss
	(Millions of dollars)
January 1, 2023	$	(58)	$	(55)	$	5	$	(108)
Other comprehensive income before reclassifications	86		—		—		86
Amounts reclassified to net income (b)	(44)		3		(5)		(46)
Other comprehensive income (loss)	42		3		(5)		40
September 30, 2023	$	(16)	$	(52)	$	—	$	(68)

(a) - Includes amounts related to supplemental executive retirement plan.

(b) - See Note E for details of amounts reclassified to net income for risk-management assets/liabilities.

The following table sets forth information about the balance of accumulated other comprehensive loss at September 30, 2023, representing unrealized gains (losses) related to risk-management assets and liabilities, net of tax:

	Risk- Management Assets/Liabilities
	(Millions of dollars)
Commodity derivative instruments expected to be realized within the next 27 months (a)	$	19
Settled interest-rate swaps and Treasury locks to be recognized over the life of the long-term, fixed-rate debt (b)	(35)
Accumulated other comprehensive loss at September 30, 2023	$	(16)

(a) - Based on commodity prices on September 30, 2023, we expect net gains of $19 million, net of tax, will be reclassified into earnings during the next 12 months. The remaining forecasted gains and losses have offsetting positions and are immaterial.

(b) - We expect net losses of $15 million, net of tax, will be reclassified into earnings during the next 12 months.

The remaining balance in accumulated other comprehensive loss relates to our retirement and other postretirement benefit plan obligations, which are expected to be amortized over the average remaining service period of employees participating in these plans.

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I.    EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Three Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	453	457.3	$	0.99
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	453	458.2	$	0.99

	Three Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	431	447.7	$	0.96
Diluted EPS
Effect of dilutive securities	—		0.5
Net income available for common stock and common stock equivalents	$	431	448.2	$	0.96

	Nine Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,970	451.2	$	4.37
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,970	452.1	$	4.36

	Nine Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,236	447.4	$	2.76
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,236	448.3	$	2.76

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J.    UNCONSOLIDATED AFFILIATES

Equity in Net Earnings from Investments - The following table sets forth our equity in net earnings from investments for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Northern Border	$	20	$	17	$	58	$	53
Overland Pass	17		10		39		23
Roadrunner	10		10		32		28
Other (a)	2		2		3		7
Equity in net earnings from investments	$	49	$	39	$	132	$	111

(a) - Includes equity in net earnings for the acquired investments from the Magellan Acquisition from the period September 25, 2023 through September 30, 2023.

We incurred expenses in transactions with unconsolidated affiliates of $33 million and $26 million for the three months ended September 30, 2023 and 2022, respectively, and $88 million and $56 million for the nine months ended September 30, 2023 and 2022, respectively, related primarily to Overland Pass and Northern Border. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

We are the operator of Roadrunner, and as a result of the Magellan Acquisition, we are also the operator of BridgeTex, HoustonLink, MVP, Powder Springs, Saddlehorn, Texas Frontera and the pipeline activities of Seabrook. In each case, we have operating agreements that provide for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments included in operating income in our Consolidated Statements of Income for all periods presented were not material. In the second quarter 2023, we made an equity contribution of $105 million to Roadrunner, which in combination with an equal contribution from our joint venture partner, was used to repay Roadrunner’s outstanding debt.

K.    COMMITMENTS AND CONTINGENCIES

Environmental Matters and Pipeline Safety - The operation of pipelines, plants and other facilities for the gathering, processing, fractionation, transportation and storage of natural gas, NGLs, condensate, Refined Products, crude oil and other products is subject to numerous and complex laws and regulations pertaining to health, safety and the environment. As an owner and/or operator of these facilities, we must comply with laws and regulations that relate to air and water quality, hazardous and solid waste management and disposal, cultural resource protection and other environmental and safety matters. The cost of planning, designing, constructing and operating pipelines, plants and other facilities must incorporate compliance with these laws, regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements and the issuance of injunctions or restrictions on operation or construction. Management does not believe that, based on currently known information, a material risk of noncompliance with these laws and regulations exists that will affect adversely our consolidated results of operations, financial condition or cash flows.

Legal Proceedings - We are a party to various legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

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L.    REVENUES

Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates, which are not material. The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at December 31, 2022 (a)	$	52
Revenue recognized included in beginning balance	(22)
Net additions (b)	141
Balance at September 30, 2023 (c)	$	171

(a) - Contract liabilities of $23 million and $29 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Net additions include increases due to the Magellan Acquisition, which are primarily related to customer prepayments for services.

(c) - Contract liabilities of $128 million and $43 million are included in the other current liabilities and other deferred credits, respectively in our Consolidated Balance Sheet.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at September 30, 2023, and December 31, 2022, relate to customer receivables. Revenue sources are disaggregated in Note M.

Unsatisfied Performance Obligations - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

The following table presents aggregate value allocated to unsatisfied performance obligations as of September 30, 2023, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 21 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
Remainder of 2023	$	291
2024	1,125
2025	873
2026	708
2027 and beyond	2,281
Total	$	5,278

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the value is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

M.    SEGMENTS

Segment Descriptions - Our operations are divided into four reportable business segments as follows:

•    our Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;

•    our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes Purity NGLs;

•    our Natural Gas Pipelines segment transports and stores natural gas; and

•    our Refined Products and Crude segment transports, stores and distributes Refined Products, certain NGLs and crude oil, as well as conducts certain commodity-related activities including liquids blending, fractionation and marketing activities. This new reportable business segment was added in conjunction with the Magellan Acquisition that closed on September 25, 2023. Results of operations for this business segment are included below for the period September 25, 2023, through September 30, 2023.

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Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility, the activity of our wholly owned captive insurance company and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Three Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	641	$	3,432	$	—	$	—	$	4,073
Residue natural gas sales	279		—		3		—		282
Gathering, processing and exchange service revenue	36		150		—		—		186
Transportation and storage revenue	—		48		143		—		191
Other	9		4		—		72		85
Total revenues (c)	965		3,634		146		72		4,817
Cost of sales and fuel (exclusive of depreciation and operating costs)	(527)		(2,875)		(2)		(22)		(3,426)
Operating costs	(119)		(168)		(51)		(13)		(351)
Equity in net earnings from investments	—		17		29		3		49
Noncash compensation expense and other	3		6		3		—		12
Segment adjusted EBITDA	$	322	$	614	$	125	$	40	$	1,101
Depreciation and amortization	$	(68)	$	(85)	$	(17)	$	(6)	$	(176)
Capital expenditures	$	126	$	189	$	70	$	1	$	386

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $756 million, of which $696 million related to revenues within the segment, cost of sales and fuel of $240 million and operating costs of $93 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $107 million, cost of sales and fuel of $8 million and operating costs of $42 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $620 million. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Three Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	4,073	$	(624)	$	3,449
Residue natural gas sales	282		—		282
Gathering, processing and exchange services revenue	186		—		186
Transportation and storage revenue	191		(3)		188
Other	85		(1)		84
Total revenues (a)	$	4,817	$	(628)	$	4,189
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(3,426)	$	627	$	(2,799)
Operating costs	$	(351)	$	(1)	$	(352)
Depreciation and amortization	$	(176)	$	(1)	$	(177)
Equity in net earnings from investments	$	49	$	—	$	49
Capital expenditures	$	386	$	12	$	398

(a) - Noncustomer revenue for the three months ended September 30, 2023, totaled $18 million related primarily to gains from derivatives on commodity sales contracts.

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Three Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	991	$	4,749	$	—	$	5,740
Residue natural gas sales	824		—		3		827
Gathering, processing and exchange services revenue	36		139		—		175
Transportation and storage revenue	—		40		134		174
Other	8		3		—		11
Total revenues (c)	1,859		4,931		137		6,927
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,461)		(4,317)		(4)		(5,782)
Operating costs	(98)		(144)		(44)		(286)
Equity in net earnings from investments	2		11		26		39
Noncash compensation expense and other	2		4		2		8
Segment adjusted EBITDA	$	304	$	485	$	117	$	906
Depreciation and amortization	$	(65)	$	(76)	$	(16)	$	(157)
Capital expenditures	$	104	$	169	$	40	$	313

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $672 million, of which $621 million related to revenues within the segment, cost of sales and fuel of $205 million and operating costs of $84 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $102 million, cost of sales and fuel of $12 million and operating costs of $37 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.0 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Three Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	5,740	$	(1,006)	$	4,734
Residue natural gas sales	827		—		827
Gathering, processing and exchange services revenue	175		—		175
Transportation and storage revenue	174		(2)		172
Other	11		(5)		6
Total revenues (a)	$	6,927	$	(1,013)	$	5,914
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,782)	$	1,009	$	(4,773)
Operating costs	$	(286)	$	—	$	(286)
Depreciation and amortization	$	(157)	$	—	$	(157)
Equity in net earnings from investments	$	39	$	—	$	39
Capital expenditures	$	313	$	14	$	327

(a) - Noncustomer revenue for the three months ended September 30, 2022, totaled $(57) million related primarily to losses from derivatives on commodity sales contracts.

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Nine Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	1,835	$	10,103	$	—	$	—	$	11,938
Residue natural gas sales	1,066		—		28		—		1,094
Gathering, processing and exchange services revenue	109		414		—		—		523
Transportation and storage revenue	—		143		434		—		577
Other	22		9		1		72		104
Total revenues (c)	3,032		10,669		463		72		14,236
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,787)		(8,597)		(17)		(22)		(10,423)
Operating costs	(339)		(481)		(145)		(13)		(978)
Equity in net earnings from investments	1		39		89		3		132
Noncash compensation expense	13		20		5		—		38
Other	(1)		775		1		—		775
Segment adjusted EBITDA	$	919	$	2,425	$	396	$	40	$	3,780
Depreciation and amortization	$	(202)	$	(248)	$	(50)	$	(6)	$	(506)
Investments in unconsolidated affiliates	$	26	$	417	$	440	$	911	$	1,794
Total assets	$	6,976	$	14,988	$	2,433	$	19,185	$	43,582
Capital expenditures	$	308	$	495	$	155	$	1	$	959

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.1 billion, of which $1.9 billion related to revenues within the segment, cost of sales and fuel of $627 million and operating costs of $273 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $326 million, cost of sales and fuel of $31 million and operating costs of $121 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.8 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Nine Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	11,938	$	(1,779)	$	10,159
Residue natural gas sales	1,094		—		1,094
Gathering, processing and exchange services revenue	523		—		523
Transportation and storage revenue	577		(7)		570
Other	104		(8)		96
Total revenues (a)	$	14,236	$	(1,794)	$	12,442
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(10,423)	$	1,795	$	(8,628)
Operating costs	$	(978)	$	(3)	$	(981)
Depreciation and amortization	$	(506)	$	(3)	$	(509)
Equity in net earnings from investments	$	132	$	—	$	132
Investments in unconsolidated affiliates	$	1,794	$	1	$	1,795
Total assets	$	43,582	$	357	$	43,939
Capital expenditures	$	959	$	33	$	992

(a) - Noncustomer revenue for the nine months ended September 30, 2023, totaled $160 million related primarily to gains from derivatives on commodity sales contracts.

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Nine Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	3,034	$	14,308	$	—	$	17,342
Residue natural gas sales	2,035		—		30		2,065
Gathering, processing and exchange services revenue	104		415		—		519
Transportation and storage revenue	—		127		387		514
Other	18		8		1		27
Total revenues (c)	5,191		14,858		418		20,467
Cost of sales and fuel (exclusive of depreciation and operating costs)	(4,148)		(12,949)		(22)		(17,119)
Operating costs	(289)		(416)		(126)		(831)
Equity in net earnings from investments	5		25		81		111
Noncash compensation expense and other	12		12		6		30
Segment adjusted EBITDA	$	771	$	1,530	$	357	$	2,658
Depreciation and amortization	$	(193)	$	(226)	$	(47)	$	(466)
Investments in unconsolidated affiliates	$	28	$	414	$	362	$	804
Total assets	$	7,079	$	14,987	$	2,205	$	24,271
Capital expenditures	$	321	$	445	$	82	$	848

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.9 billion, of which $1.7 billion related to revenues within the segment, cost of sales and fuel of $503 million and operating costs of $241 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $329 million, cost of sales and fuel of $40 million and operating costs of $108 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $3.1 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Nine Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	17,342	$	(3,096)	$	14,246
Residue natural gas sales	2,065		—		2,065
Gathering, processing and exchange services revenue	519		—		519
Transportation and storage revenue	514		(6)		508
Other	27		(10)		17
Total revenues (a)	$	20,467	$	(3,112)	$	17,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(17,119)	$	3,102	$	(14,017)
Operating costs	$	(831)	$	4	$	(827)
Depreciation and amortization	$	(466)	$	(3)	$	(469)
Equity in net earnings from investments	$	111	$	—	$	111
Investments in unconsolidated affiliates	$	804	$	—	$	804
Total assets	$	24,271	$	168	$	24,439
Capital expenditures	$	848	$	38	$	886

(a) - Noncustomer revenue for the nine months ended September 30, 2022, totaled $(364) million related primarily to losses from derivatives on commodity sales contracts.

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	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Reconciliation of net income to total segment adjusted EBITDA
Net income	$	454	$	432	$	1,971	$	1,237
Add:
Interest expense, net of capitalized interest	215		167		561		510
Depreciation and amortization	177		157		509		469
Income taxes	141		132		616		385
Noncash compensation expense and other	14		14		32		51
Other corporate costs (b)	100		4		91		6
Total segment adjusted EBITDA (a)	$	1,101	$	906	$	3,780	$	2,658

(a) - The nine months ended September 30, 2023 includes $667 million related to the Medford incident, including a settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs.

(b) - Includes costs related to the Magellan Acquisition of $123 million, offset partially by interest income of $26 million for the three months ended September 30, 2023, and costs related to the Magellan Acquisition of $133 million, offset partially by interest income of $42 million for the nine months ended September 30, 2023.

ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with our unaudited Consolidated Financial Statements and the Notes to Consolidated Financial Statements in this Quarterly Report, as well as our Annual Report.

RECENT DEVELOPMENTS

Please refer to the “Financial Results and Operating Information” and “Liquidity and Capital Resources” sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations in this Quarterly Report for additional information.

Magellan Acquisition - On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. The acquisition strategically diversifies our complementary asset base and allows for significant expected synergies as a combined entity. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash, for a total consideration of $14.1 billion. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition. We funded the cash portion of the acquisition with an underwritten public offering of $5.25 billion senior unsecured notes.

For additional information on the Magellan Acquisition, see Note B of the Notes to Consolidated Financial Statements in this Quarterly Report. See Part 2, Item 1A “Risk Factors” for further discussion of risks related to the Magellan Acquisition. Additional information regarding the financial results and operating information of our Refined Products and Crude segment subsequent to the closing of the Magellan Acquisition is provided in “Financial Results and Operating Information”.

Market Conditions and Business Update - We experienced increased volumes across our system in the third quarter 2023, compared with the third quarter 2022, highlighting our extensive and integrated assets that are located in, and connected with, some of the most productive shale basins, as well as refineries and demand centers, in the United States. Although the energy industry has experienced many commodity cycles, we have positioned ourselves to reduce exposure to direct commodity price volatility. Each of our four reportable segments are primarily fee-based, and we expect our consolidated earnings to be more than 85% fee-based in 2023. While our Natural Gas Gathering and Processing segment’s earnings are primarily fee-based, we have direct commodity price exposure related primarily to fee with POP contracts, and we have hedged approximately 70% of our forecasted equity volumes for the remainder of 2023. In addition, our Natural Gas Gathering and Processing and Natural Gas Liquids segments are exposed to volumetric risk as a result of drilling and completion activity, severe weather disruptions, operational outages, global crude oil, NGL and natural gas demand, changes in gas-to-oil ratios and normal volumetric well declines. Our Refined Products and Crude segment is exposed to volumetric risk due to demand for Refined Products and crude oil in the markets we serve. Our Natural Gas Pipelines segment is not exposed to significant volumetric risk due to nearly all of our capacity being subscribed under long-term, firm fee-based contracts.

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Medford Incident - On July 9, 2022, a fire occurred at our 210 MBbl/d Medford, Oklahoma, natural gas liquids fractionation facility. On January 9, 2023, we reached an agreement with our insurers to settle all claims for physical damage and business interruption related to the Medford incident. Under the terms of the settlement agreement, we agreed to resolve the claims for total insurance payments of $930 million, $100 million of which was received in 2022. The remaining $830 million was received in the first quarter 2023, resulting in a one-time settlement gain of $779 million. The proceeds serve as settlement for property damage, business interruption claims to the date of settlement and as payment in lieu of future business interruption insurance claims.

The Medford incident resulted in an increase in operating income and adjusted EBITDA of $697 million due to a favorable impact of $667 million in the nine months ended September 30, 2023, from the settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs compared with an approximately $30 million unfavorable impact of the 45-day waiting period in the nine months ended September 30, 2022. We expect our cash from operations in the remainder of 2023 and in 2024 to be impacted by incurred costs resulting from the Medford incident for which we no longer receive business interruption proceeds.

Due to market demand and a more favorable completion schedule, we announced plans to construct a new 125 MBbl/d MB-6 NGL fractionator in Mont Belvieu, Texas, instead of rebuilding our Medford NGL fractionator at this time. The MB-6 fractionator will produce purity ethane instead of the ethane/propane mix previously produced at the Medford facility. The 125 MBbl/d capacity of the MB-6 fractionator is expected to be economically comparable to the capacity lost at Medford. In addition, our 125 MBbl/d MB-5 NGL fractionator was completed in April 2023, which has reduced the need for third-party fractionation while the new MB-6 fractionator is being constructed.

Sustainability and Social Responsibility - Through our participation in the 2022 S&P Global Corporate Sustainability Assessment, we qualified for inclusion in the S&P Global Sustainability Yearbook for the third consecutive year, ranking in the top 10% of the Oil and Gas Storage and Transportation industry and being recognized as an Industry Mover. We continue to look for ways to reduce our GHG emissions and utilize more efficient technologies. We are evaluating the development of renewable energy and low-carbon projects, including opportunities that may complement our midstream assets and expertise.

Natural Gas - In our Natural Gas Gathering and Processing segment, processed volumes increased in the third quarter 2023, compared with the third quarter 2022, due primarily to increased producer activity in the Rocky Mountain and Mid-Continent regions.

In our Natural Gas Pipelines segment, as a result of recently completed expansion projects, we fully subscribed an additional 4 Bcf of our existing storage capacity in Oklahoma through 2027, with 90% subscribed through 2029. In addition, we are nearing the completion of the electrification of certain compression assets on Viking to improve the reliability of our operations while lowering our Scope 1 emissions from this equipment. Viking is seeking to recover its investment in the project through a proposed increase in rates filed in July 2023.

NGLs - In our Natural Gas Liquids segment, we benefited from increased volumes in the third quarter 2023, compared with the third quarter 2022, due primarily to increased production across our integrated system.

We have begun initial work, primarily on long lead time components, for two NGL pipeline expansion projects. Activities are underway to complete the looping of the West Texas NGL pipeline, which will more than double our NGL capacity out of the Permian Basin. The full loop is expected to be in service in the first quarter of 2025. We also are taking steps towards expanding the Elk Creek pipeline to 400 MBbl/d to provide capacity for growing volumes in the Rocky Mountain region.

Ethane Economics - Price differentials between ethane and natural gas can cause natural gas processors to recover ethane or leave it in the natural gas stream, known as ethane rejection. As a result of these ethane economics, ethane volumes on our system can fluctuate. Ethane volumes under long-term contracts delivered to our NGL system increased 35 MBbl/d to an average of 490 MBbl/d in the third quarter 2023, compared with an average of 455 MBbl/d in the third quarter 2022, due primarily to changes in ethane extraction economics. We estimate that there are approximately 250 MBbl/d of discretionary ethane, consisting of approximately 150 MBbl/d in the Rocky Mountain region and approximately 100 MBbl/d in the Mid-Continent region, that could be recovered and transported on our system.

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Capital Projects - Our primary capital projects are outlined in the table below:

Project	Scope	Approximate Cost (a)	Completion
Natural Gas Gathering and Processing		(In millions)
Demicks Lake III plant	200 MMcf/d processing plant in the core of the Williston Basin	$188	Completed
Natural Gas Liquids
MB-5 fractionator	125 MBbl/d NGL fractionator in Mont Belvieu, Texas	$750	Completed
MB-6 fractionator	125 MBbl/d NGL fractionator in Mont Belvieu, Texas	$550	First Quarter 2025
West Texas NGL pipeline expansion	Increase capacity to 740 MBbl/d in the Permian Basin	$520	First Quarter 2025
Natural Gas Pipelines
Viking compression	Upgrade reliability of certain compressor assets	$95	Fourth Quarter 2023

(a) - Excludes capitalized interest/AFUDC.

Debt Issuances - In August 2023, we completed an underwritten public offering of $5.25 billion senior unsecured notes consisting of $750 million, 5.55% senior notes due 2026; $750 million, 5.65% senior notes due 2028; $500 million, 5.80% senior notes due 2030; $1.5 billion, 6.05% senior notes due 2033; and $1.75 billion, 6.625% senior notes due 2053. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $5.2 billion. The net proceeds were used to fund the cash consideration and other costs related to the Magellan Acquisition.

Debt Repayments - In June 2023, we redeemed our $500 million, 7.5% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

In February 2023, we redeemed our $425 million, 5.0% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

Dividends - In February, May and August 2023, we paid a quarterly common stock dividend of $0.955 per share ($3.82 per share on an annualized basis), an increase of 2% compared with the same quarters in the prior year. Our dividend growth is due primarily to the increase in cash flows resulting from the growth of our operations. We declared a quarterly common stock dividend of $0.955 per share ($3.82 per share on an annualized basis) in October 2023. The quarterly common stock dividend will be paid November 14, 2023, to shareholders of record at the close of business on November 1, 2023.

Goodwill Impairment Review - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. At July 1, 2023, we assessed qualitative factors to determine whether it was more likely than not that the fair value of each of our reporting units with goodwill was less than its carrying amount. After assessing qualitative factors (including macroeconomic conditions, industry and market considerations, costs and overall financial performance), we determined that it was more likely than not that the fair value of the Natural Gas Pipelines and Natural Gas Liquids reporting units was not less than their respective carrying value, that no further testing was necessary, and that goodwill was not considered impaired.

FINANCIAL RESULTS AND OPERATING INFORMATION

How We Evaluate Our Operations

Management uses a variety of financial and operating metrics to analyze our performance. Our consolidated financial metrics include: (1) operating income; (2) net income; (3) diluted EPS; and (4) adjusted EBITDA. We evaluate segment operating results using adjusted EBITDA and our operating metrics, which include various volume and rate statistics that are relevant for the respective segment. These operating metrics allow investors to analyze the various components of segment financial results in terms of volumes and rate/price. Management uses these metrics to analyze historical segment financial results and as the key inputs for forecasting and budgeting segment financial results. For additional information on our operating metrics, see the respective segment subsections of this “Financial Results and Operating Information” section.

Non-GAAP Financial Measures - Adjusted EBITDA is a non-GAAP measure of our financial performance. Adjusted EBITDA is defined as net income adjusted for interest expense, depreciation and amortization, noncash impairment charges, income taxes, allowance for equity funds used during construction, noncash compensation expense and certain other noncash items. We believe this non-GAAP financial measure is useful to investors because it and similar measures are used by many

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companies in our industry as a measurement of financial performance and is commonly employed by financial analysts and others to evaluate our financial performance and to compare financial performance among companies in our industry. Adjusted EBITDA should not be considered an alternative to net income, EPS or any other measure of financial performance presented in accordance with GAAP. Additionally, this calculation may not be comparable with similarly titled measures of other companies.

Consolidated Operations

Selected Financial Results - The following table sets forth certain selected financial results for the periods indicated:

	Three Months Ended				Nine Months Ended				Three Months	Nine Months
	September 30,				September 30,				2023 vs. 2022	2023 vs. 2022
Financial Results	2023		2022		2023		2022		$ Increase (Decrease)	$ Increase (Decrease)
	(Millions of dollars, except per share amounts)
Revenues
Commodity sales	$	3,760	$	5,564	$	11,287	$	16,320	(1,804)	(5,033)
Services	429		350		1,155		1,035		79	120
Total revenues	4,189		5,914		12,442		17,355		(1,725)	(4,913)
Cost of sales and fuel (exclusive of items shown separately below)	2,799		4,773		8,628		14,017		(1,974)	(5,389)
Operating costs	352		286		981		827		66	154
Depreciation and amortization	177		157		509		469		20	40
Transaction costs	123		—		133		—		123	133
Other operating (income) expense, net	(1)		(2)		(782)		(9)		(1)	773
Operating income	$	739	$	700	$	2,973	$	2,051	39	922
Equity in net earnings from investments	$	49	$	39	$	132	$	111	10	21
Interest expense, net of capitalized interest	$	(215)	$	(167)	$	(561)	$	(510)	48	51
Net income	$	454	$	432	$	1,971	$	1,237	22	734
Diluted EPS	$	0.99	$	0.96	$	4.36	$	2.76	0.03	1.60
Adjusted EBITDA	$	1,001	$	902	$	3,689	$	2,652	99	1,037
Capital expenditures	$	398	$	327	$	992	$	886	71	106

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Financial Measures” section.

Changes in commodity prices and sales volumes affect both revenues and cost of sales and fuel in our Consolidated Statements of Income and, therefore, the impact is largely offset between these line items.

Operating income increased $39 million for the three months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•Natural Gas Liquids - an increase of $76 million in exchange services due primarily to higher volumes across our system, and an increase of $67 million in optimization and marketing due primarily to higher earnings on sales of Purity NGLs held in inventory;

•Natural Gas Gathering and Processing - an increase of $54 million from higher volumes in the Rocky Mountain and Mid-Continent regions, offset partially by $14 million due primarily to lower realized NGL prices, net of hedging;

•Refined Products and Crude - an increase due to the impact of the Magellan Acquisition for the period of September 25, 2023, through September 30, 2023; and

•Natural Gas Pipelines - an increase of $9 million in transportation and storage services due primarily to higher firm and interruptible transportation volumes and higher firm storage volumes; offset by

•Consolidated Operating and Transaction Costs - an increase of $189 million due primarily to transaction costs related to the Magellan Acquisition, higher employee-related costs and outside services due to the growth of our operations and higher property insurance premiums.

Operating income increased $922 million for the nine months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•Natural Gas Liquids - an increase of $697 million related to the Medford incident and an increase of $168 million in exchange services;

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•Natural Gas Gathering and Processing - an increase of $151 million from higher volumes in the Rocky Mountain and Mid-Continent regions and an increase of $51 million due primarily to higher average fee rates;

•Refined Products and Crude - an increase due to the impact of the Magellan Acquisition for the period of September 25, 2023, through September 30, 2023; and

•Natural Gas Pipelines - an increase of $47 million in transportation and storage services due primarily to higher storage rates, higher firm and interruptible transportation volumes and higher short-term storage activity; offset by

•Consolidated Operating, Depreciation and Transaction Costs - an increase of $327 million due primarily to transaction costs related to the Magellan Acquisition, higher employee-related costs, outside services and depreciation expense due primarily to the growth of our operations, and higher property insurance premiums.

Net income and diluted EPS increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to the items discussed above, higher interest income due to both higher cash balances and higher interest rates, and higher equity in net earnings from investments, with the nine months ended September 30, 2023 favorably impacted by the mark-to-market of investments associated with certain benefit plan investments. These increases were offset partially by higher income taxes and higher interest expense due to both higher debt balances and by transaction costs included in interest expense related to bridge facility commitment fees.

Capital expenditures increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to our growth projects.

Additional information regarding our financial results and operating information is provided in the following discussion for each of our segments.

Natural Gas Gathering and Processing

Overview - Our Natural Gas Gathering and Processing segment provides midstream services to producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. Raw natural gas is typically gathered at the wellhead, compressed and transported through pipelines to our processing facilities. Most raw natural gas produced at the wellhead also contains a mixture of condensate and NGL components, including ethane, propane, iso-butane, normal butane and natural gasoline. Processed natural gas, usually referred to as residue natural gas, is then recompressed and delivered to natural gas pipelines, storage facilities and end users. The NGLs separated from the raw natural gas are sold and delivered through NGL pipelines to fractionation facilities for further processing.

Our Natural Gas Gathering and Processing segment’s earnings are primarily fee-based, but we have some direct commodity price exposure related primarily to fee with POP contracts. Under certain fee with POP contracts, our contractual fees and POP percentage may increase or decrease if production volumes, delivery pressures or commodity prices change relative to specified thresholds. To mitigate the impact of this commodity price exposure, we have hedged a significant portion of our Natural Gas Gathering and Processing segment’s commodity price risk for the remainder of 2023 and into 2024. This segment has substantial long-term acreage dedications in some of the most productive areas of the Williston Basin and Mid-Continent region, which helps to mitigate long-term volumetric risk.

Capital Projects - Our Natural Gas Gathering and Processing segment has invested in growth projects in NGL-rich areas in the Williston Basin. See “Capital Projects” in the “Recent Developments” section for more information on our capital projects.

For a discussion of our capital expenditure financing, see “Capital Expenditures” in the “Liquidity and Capital Resources” section.

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Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Gathering and Processing segment for the periods indicated:

	Three Months Ended				Nine Months Ended				Three Months	Nine Months
	September 30,				September 30,				2023 vs. 2022	2023 vs. 2022
Financial Results	2023		2022		2023		2022		$ Increase (Decrease)	$ Increase (Decrease)
	(Millions of dollars)
NGL and condensate sales	$	641	$	991	$	1,835	$	3,034	(350)	(1,199)
Residue natural gas sales	279		824		1,066		2,035		(545)	(969)
Gathering, compression, dehydration and processing fees and other revenue	45		44		131		122		1	9
Cost of sales and fuel (exclusive of depreciation and operating costs)	(527)		(1,461)		(1,787)		(4,148)		(934)	(2,361)
Operating costs, excluding noncash compensation adjustments	(114)		(95)		(326)		(279)		19	47
Equity in net earnings from investments	—		2		1		5		(2)	(4)
Other	(2)		(1)		(1)		2		(1)	(3)
Adjusted EBITDA	$	322	$	304	$	919	$	771	18	148
Capital expenditures	$	126	$	104	$	308	$	321	22	(13)

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Financial Measures” section.

Changes in commodity prices and sales volumes affect both revenues and cost of sales and fuel and, therefore, the impact is largely offset between these line items.

Adjusted EBITDA increased $18 million for the three months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•an increase of $54 million from higher volumes due primarily to increased producer activity in the Rocky Mountain and Mid-Continent regions; offset by

•an increase of $19 million in operating costs due primarily to higher employee-related costs, outside services and materials and supplies expense due primarily to the growth of our operations and higher property insurance premiums; and

•a decrease of $14 million due primarily to lower realized NGL prices, net of hedging.

Adjusted EBITDA increased $148 million for the nine months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•an increase of $151 million from higher volumes due primarily to increased producer activity in the Rocky Mountain and Mid-Continent regions, and the impact of severe weather in the Rocky Mountain region in the second quarter 2022; and

•an increase of $51 million due primarily to higher average fee rates, offset partially by lower realized NGL prices, net of hedging; offset by

•an increase of $47 million in operating costs due primarily to higher employee-related costs, outside services and materials and supplies expense due primarily to the growth of our operations and higher property insurance premiums.

Capital expenditures increased for the three months ended September 30, 2023, compared with the same period in 2022, due primarily to our routine growth projects. Capital expenditures decreased for the nine months ended September 30, 2023, compared with the same period in 2022, due primarily to our Demicks Lake III project completed in the first quarter 2023.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Operating Information (a)	2023		2022		2023		2022
Natural gas processed (BBtu/d) (b)	3,085		2,743		2,935		2,590
Average fee rate ($/MMBtu)	$	1.17	$	1.16	$	1.17	$	1.09

(a) - Includes volumes for consolidated entities only.

(b) - Includes volumes we processed at company-owned and third-party facilities.

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Our natural gas processed volumes increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to increased producer activity in the Rocky Mountain and Mid-Continent regions, and the impact of severe weather in the Rocky Mountain region in the second quarter 2022.

Our average fee rate increased for the nine months ended September 30, 2023, compared with the same period in 2022, due primarily to inflation-based escalators in our contracts, and for certain fee with POP contracts, our contractual fees increased due to production volumes, delivery pressures or commodity prices relative to specified contractual thresholds.

Natural Gas Liquids

Overview - Our Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store Purity NGLs, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region, which includes the Williston, Powder River and DJ Basins. We provide midstream services to producers of NGLs and deliver those products to the two primary market centers: one in the Mid-Continent in Conway, Kansas, and the other in the Gulf Coast in Mont Belvieu, Texas. We own or have an ownership interest in FERC-regulated NGL gathering and distribution pipelines in Oklahoma, Kansas, Texas, New Mexico, Montana, North Dakota, Wyoming and Colorado, and terminal and storage facilities in Kansas, Nebraska, Iowa and Illinois. We have a 50% ownership interest in Overland Pass, which operates an interstate NGL pipeline originating in Wyoming and Colorado and terminating in Kansas. The majority of the pipeline-connected natural gas processing plants in the Williston Basin, Oklahoma, Kansas and the Texas Panhandle are connected to our NGL gathering systems. We lease rail cars and own and operate truck- and rail-loading and -unloading facilities connected to our NGL fractionation, storage and pipeline assets. We also own FERC-regulated NGL distribution pipelines in Kansas, Nebraska, Iowa, Illinois and Indiana that connect our Mid-Continent assets with Midwest markets, including Chicago, Illinois. A portion of our ONEOK North System transports Refined Products, including unleaded gasoline and diesel.

Capital Projects - Our Natural Gas Liquids segment invests in growth projects to transport, fractionate, store and deliver to market centers NGL supply from shale and other resource development areas. Our growth strategy is focused around connecting diversified supply basins from the Rocky Mountain region through the Mid-Continent region and the Permian Basin with demand for Purity NGLs from the petrochemical and refining industries and NGL exports in the Gulf Coast. We proactively monitor lead times on materials and equipment used in constructing capital projects, and we enter into supply agreements for long-lead items for potential projects to plan for future growth. See “Capital Projects” in the “Recent Developments” section for more information on our capital projects.

In the nine months ended September 30, 2023, we connected one third-party natural gas processing plant in the Permian Basin and one affiliate natural gas processing plant in the Rocky Mountain region.

For a discussion of our capital expenditure financing, see “Capital Expenditures” in the “Liquidity and Capital Resources” section.

Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Liquids segment for the periods indicated:

	Three Months Ended				Nine Months Ended				Three Months	Nine Months
	September 30,				September 30,				2023 vs. 2022	2023 vs. 2022
Financial Results	2023		2022		2023		2022		$ Increase (Decrease)	$ Increase (Decrease)
	(Millions of dollars)
NGL and condensate sales	$	3,432	$	4,749	$	10,103	$	14,308	(1,317)	(4,205)
Exchange service and other revenues	154		142		423		423		12	—
Transportation and storage revenues	48		40		143		127		8	16
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,875)		(4,317)		(8,597)		(12,949)		(1,442)	(4,352)
Operating costs, excluding noncash compensation adjustments	(161)		(139)		(461)		(399)		22	62
Equity in net earnings from investments	17		11		39		25		6	14
Other	(1)		(1)		775		(5)		—	780
Adjusted EBITDA	$	614	$	485	$	2,425	$	1,530	129	895
Capital expenditures	$	189	$	169	$	495	$	445	20	50

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Financial Measures” section.

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Changes in commodity prices and sales volumes affect both revenues and cost of sales and fuel and, therefore, the impact is largely offset between these line items.

Adjusted EBITDA increased $129 million for the three months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•an increase of $76 million in exchange services due primarily to higher volumes across the system;

•an increase of $67 million in optimization and marketing due primarily to higher earnings on sales of Purity NGLs held in inventory; and

•an increase of $8 million due to higher transportation and storage revenue; offset by

•an increase of $22 million in operating costs due primarily to higher employee-related costs and higher outside services due to the growth of our operations, and higher property insurance premiums; and

•a decrease of $5 million related to the Medford incident, due to $35 million in third-party fractionation costs in 2023 compared with an approximately $30 million unfavorable impact of the 45-day waiting period in 2022.

Adjusted EBITDA increased $895 million for the nine months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•an increase of $697 million related to the Medford incident, due to a favorable impact of $667 million in 2023 from the settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs, compared with an approximately $30 million unfavorable impact of the 45-day waiting period in 2022;

•an increase of $168 million in exchange services due primarily to higher volumes in the Rocky Mountain region and Permian Basin, offset partially by narrower commodity price differentials and lower related volumes;

•an increase of $60 million in optimization and marketing due primarily to higher earnings on sales of Purity NGLs held in inventory;

•an increase of $16 million due to higher transportation and storage revenue; and

•an increase of $14 million in equity in net earnings from investments due primarily to higher volumes delivered to the Overland Pass pipeline; offset by

•an increase of $62 million in operating costs due primarily to higher employee-related costs and higher outside services due to the growth of our operations, and higher property insurance premiums.

Capital expenditures increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to growth projects.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Operating Information	2023		2022		2023		2022
Raw feed throughput (MBbl/d) (a)	1,413		1,278		1,357		1,252
Average Conway-to-Mont Belvieu OPIS price differential - ethane in ethane/propane mix ($/gallon)	$	0.08	$	0.03	$	0.04	$	0.04

(a) - Represents physical raw feed volumes for which we provide transportation and/or fractionation services.

We generally expect ethane volumes to increase or decrease with corresponding increases or decreases in overall NGL production. However, ethane volumes may experience growth or decline greater than corresponding growth or decline in overall NGL production due to ethane economics causing producers to recover or reject ethane.

Volumes increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to increased production in the Permian Basin and Rocky Mountain region, offset partially by lower ethane volumes in the Rocky Mountain region. The three months ended September 30, 2023, also benefited from increased ethane volumes in the Mid-Continent region.

Natural Gas Pipelines

Overview - In our Natural Gas Pipelines segment, our assets are connected to key supply areas and demand centers, including export markets in Mexico via Roadrunner and supply areas in Canada and the United States via our interstate and intrastate natural gas pipelines and Northern Border, which enable us to provide essential natural gas transportation and storage services. Continued demand from local distribution companies, electric-generation facilities and large industrial companies supported low-cost expansions that position us well to provide additional services to our customers when needed.

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Capital Projects - Our Natural Gas Pipelines segment invests in growth projects that provide transportation and storage services to end users. In December 2022, our Saguaro Connector Pipeline LLC subsidiary filed a Presidential Permit application with the FERC to construct and operate new international border-crossing facilities at the U.S. and Mexico border. The proposed border facilities would connect upstream with a potential intrastate pipeline, the Saguaro Connector Pipeline, which would be owned and operated by ONEOK. Additionally, the proposed border facilities would connect at the international boundary with a new pipeline under development in Mexico for delivery to a liquefied natural gas export facility on the west coast of Mexico. The final investment decision on the pipeline is expected by year-end 2023.

See “Capital Projects” in the “Recent Developments” section for more information on our capital projects.

For a discussion of our capital expenditure financing, see “Capital Expenditures” in the “Liquidity and Capital Resources” section.

Selected Financial Results and Operating Information - The following tables set forth certain selected financial results and operating information for our Natural Gas Pipelines segment for the periods indicated:

	Three Months Ended				Nine Months Ended				Three Months	Nine Months
	September 30,				September 30,				2023 vs. 2022	2023 vs. 2022
Financial Results	2023		2022		2023		2022		$ Increase (Decrease)	$ Increase (Decrease)
	(Millions of dollars)
Transportation revenues	$	106	$	101	$	315	$	301	5	14
Storage revenues	37		33		119		86		4	33
Residue natural gas sales and other revenues	3		3		29		31		—	(2)
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2)		(4)		(17)		(22)		(2)	(5)
Operating costs, excluding noncash compensation adjustments	(49)		(43)		(140)		(122)		6	18
Equity in net earnings from investments	29		26		89		81		3	8
Other	1		1		1		2		—	(1)
Adjusted EBITDA	$	125	$	117	$	396	$	357	8	39
Capital expenditures	$	70	$	40	$	155	$	82	30	73

See reconciliation of net income to adjusted EBITDA in the “Non-GAAP Financial Measures” section.

Adjusted EBITDA increased $8 million for the three months ended September 30, 2023, compared with the same period in 2022, due primarily to an increase of $9 million in transportation and storage services due primarily to higher firm and interruptible transportation and higher firm storage volumes.

Adjusted EBITDA increased $39 million for the nine months ended September 30, 2023, compared with the same period in 2022, primarily as a result of the following:

•an increase of $47 million in transportation and storage services due primarily to higher storage rates on renegotiated contracts, higher firm and interruptible transportation volumes and higher short-term storage activity; offset by

•an increase of $18 million in operating costs due primarily to higher employee-related costs and outside services due to timing of maintenance activities and the growth of our operations.

Capital expenditures increased for the three and nine months ended September 30, 2023, compared with the same periods in 2022, due primarily to growth projects, including the Viking compression project.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Operating Information (a)	2023		2022		2023		2022
Natural gas transportation capacity contracted (MDth/d)	7,704		7,318		7,684		7,367
Transportation capacity contracted	96	%	92	%	95	%	93	%

(a) - Includes volumes for consolidated entities only.

In April 2022, the FERC initiated a review of Guardian’s rates pursuant to Section 5 of the Natural Gas Act. In August 2022, Guardian reached a settlement in principle with the participants in the Section 5 rate case. The FERC approved the settlement

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in February 2023, which resulted in a reduction of rates starting in April 2023. The reduced rates did not have a material impact on our results of operations.

In July 2023, Viking filed a proposed increase in rates pursuant to Section 4 of the Natural Gas Act with the FERC. The FERC is currently reviewing the filing. While the ultimate outcome of the filing cannot be predicted, we do not expect it to materially impact our results of operations.

Refined Products and Crude

Overview - Our Refined Products and Crude segment is principally engaged in the transportation, storage and distribution of Refined Products, NGLs and crude oil, primarily throughout the central United States. Products transported on our Refined Products pipeline system include gasoline, distillates, aviation fuel and certain NGLs. Shipments originate on our Refined Products pipeline system from direct connections to refineries or through interconnections with other pipelines or terminals for transportation and ultimate distribution to retail fueling stations, convenience stores, travel centers, railroads, airports and other end users. Our crude oil assets are strategically located to serve crude oil supply, trading and demand centers. Revenue is generated primarily through transportation tariffs on our pipelines, storage fees from our terminals, pipeline capacity fees and tolling fees from our condensate splitter. In addition, we earn revenue for terminalling and other services.

Property - Our Refined Products and Crude segment includes the following wholly owned assets:

•9,800 miles of Refined Product pipeline system beginning in the Texas Gulf coast and covering a 15-state area across the central U.S;

•54 Refined Product terminals with 47 MMBbl of storage capacity, including one marine storage terminal along the Houston Ship Channel;

•1,000 miles of crude oil pipelines, including the 450-mile Longhorn pipeline, with operating capacity of

275 MBbl/d from the Permian Basin to Houston, Texas, approximately 400 miles of pipeline in Kansas and

Oklahoma and an additional 100 miles in Texas;

•crude oil storage, primarily located in East Houston, Cushing and Corpus Christi, with combined storage capacity of 31 MMBbl; and

•one condensate splitter in Corpus Christi with 50 MBbl/d of capacity.

Unconsolidated Affiliates - Our Refined Products and Crude segment has the following unconsolidated affiliates:

•a 30% ownership interest in BridgeTex, which owns an approximately 400-mile crude oil pipeline with transport capacity of up to 440 MBbl/d that connects Permian Basin crude oil to our East Houston terminal;

•a 30% ownership interest in Saddlehorn, which owns an undivided joint interest in an approximately 600-mile pipeline, with transport capacity of up to 290 MBbl/d of crude oil from the DJ Basin and Rocky Mountain region to storage facilities in Cushing, including our Cushing terminal; and

•a 25% ownership in MVP, which owns a Refined Products marine storage terminal along the Houston Ship Channel in Pasadena, Texas, including more than 5 MMBbl of storage, two ship docks and truck loading facilities.

Our other unconsolidated affiliates in this segment are not material.

Selected Financial Results and Operating Information - Financial results and operating information for our Refined Products and Crude segment for the period subsequent to the closing of the Magellan Acquisition were not material. Adjusted EBITDA was $40 million, which includes a $9 million mark-to-market gain on commodity derivative positions settling in the fourth quarter 2023.

Due to the Magellan Acquisition, commodity inventory balances within our Refined Products and Crude segment were recorded at market value, which was an approximate $50 million increase over the pre-acquisition value. We expect to realize the majority of the related unfavorable impact of this acquisition adjustment in the fourth quarter 2023, as the acquired inventory is sold.

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Non-GAAP Financial Measures

The following table sets forth a reconciliation of net income, the nearest comparable GAAP financial performance measure, to adjusted EBITDA for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(Unaudited)	2023		2022		2023		2022
Reconciliation of net income to adjusted EBITDA	(Millions of dollars)
Net income	$	454	$	432	$	1,971	$	1,237
Add:
Interest expense, net of capitalized interest	215		167		561		510
Depreciation and amortization	177		157		509		469
Income taxes	141		132		616		385
Noncash compensation expense and other	14		14		32		51
Adjusted EBITDA (a)(b)	$	1,001	$	902	$	3,689	$	2,652
Reconciliation of segment adjusted EBITDA to adjusted EBITDA
Segment adjusted EBITDA:
Natural Gas Gathering and Processing	$	322	$	304	$	919	$	771
Natural Gas Liquids (a)	614		485		2,425		1,530
Natural Gas Pipelines	125		117		396		357
Refined Products and Crude	40		—		40		—
Other (b)	(100)		(4)		(91)		(6)
Adjusted EBITDA (a)(b)	$	1,001	$	902	$	3,689	$	2,652

(a) - The nine months ended September 30, 2023, includes $667 million related to the Medford incident, including a settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs.

(b) - Includes transaction costs related to the Magellan Acquisition of $123 million, offset partially by interest income of $26 million, for the three months ended September 30, 2023, and transaction costs related to the Magellan Acquisition of $133 million, offset partially by interest income of $42 million, for the nine months ended September 30, 2023.

CONTINGENCIES

See Note K of the Notes to Consolidated Financial Statements in this Quarterly Report for discussion of regulatory and environmental matters.

LIQUIDITY AND CAPITAL RESOURCES

General - Our primary sources of cash inflows are operating cash flows, proceeds from our commercial paper program and our $2.5 Billion Credit Agreement, debt issuances and the issuance of common stock for our liquidity and capital resources requirements.

On January 9, 2023, we reached an agreement with our insurers to settle all claims for physical damage and business interruption related to the Medford incident. Under the terms of the settlement agreement, we agreed to resolve the claims for total insurance payments of $930 million, $100 million of which was received in 2022. The remaining $830 million was received in the first quarter 2023. The proceeds serve as settlement for property damage, business interruption claims to the date of settlement and as payment in lieu of future business interruption insurance claims. We expect our cash from operations in the remainder of 2023 and in 2024 to be impacted by incurred costs resulting from the Medford incident for which we no longer receive business interruption proceeds.

We expect our sources of cash inflows to provide sufficient resources to finance our operations, quarterly cash dividends, capital expenditures, maturities of long-term debt and contributions to unconsolidated affiliates. We believe we have sufficient liquidity due to our $2.5 Billion Credit Agreement, which expires in June 2027, and access to $1.0 billion available through our “at-the-market” equity program. As of the date of this report, no shares have been sold through our “at-the-market” equity program.

Cash Management - At September 30, 2023, we had $284 million of cash and cash equivalents. Our cash balance is composed primarily of highly liquid government money market funds and deposits fully insured by the Federal Deposit Insurance Corporation.

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We use a centralized cash management program that concentrates the cash assets of our nonguarantor operating subsidiaries in joint accounts for the purposes of providing financial flexibility and lowering the cost of borrowing, transaction costs and bank fees. Our centralized cash management program provides that funds in excess of the daily needs of our operating subsidiaries are concentrated, consolidated or otherwise made available for use by other entities within our consolidated group. Our operating subsidiaries participate in this program to the extent they are permitted pursuant to FERC regulations or their operating agreements. Under the cash management program, depending on whether a participating subsidiary has short-term cash surpluses or cash requirements, we provide cash to the subsidiary or the subsidiary provides cash to us.

Guarantees - We guarantee certain debt securities of ONEOK Partners and Magellan, and ONEOK Partners, Magellan and the Intermediate Partnership guarantee certain of our debt securities. The guarantees in place for our, ONEOK Partners’ and Magellan’s indebtedness are full, irrevocable, unconditional and absolute joint and several guarantees to the holders of each series of outstanding securities. Liabilities under the guarantees rank equally in right of payment with all existing and future senior unsecured indebtedness. The Intermediate Partnership holds all of ONEOK Partners’ interests and equity in its subsidiaries, which are nonguarantors, and substantially all the assets and operations reside with nonguarantor operating subsidiaries. Magellan holds interests in its subsidiaries, which are nonguarantors, and substantially all the assets and operations reside with nonguarantor operating subsidiaries. Therefore, as allowed under Rule 13-01, we have excluded the summarized financial information for each issuer and guarantor as the combined financial information of the subsidiary issuers and parent guarantor, excluding our ownership of all the interests in ONEOK Partners and Magellan, reflect no material assets, liabilities or results of operations, apart from the guaranteed indebtedness. For additional information on our, ONEOK Partners’ and Magellan’s indebtedness, please see Note F of the Notes to Consolidated Financial Statements in this Quarterly Report.

Short-term Liquidity - Our principal sources of short-term liquidity consist of cash generated from operating activities, distributions received from our equity-method investments, proceeds from our commercial paper program and our $2.5 Billion Credit Agreement. As of September 30, 2023, we had no borrowings under our $2.5 Billion Credit Agreement and we are in compliance with all covenants.

As of September 30, 2023, we had a working capital deficit of $110 million (defined as current assets less current liabilities). Generally, our working capital is influenced by several factors, including, among other things: (i) the timing of (a) debt and equity issuances, (b) the funding of capital expenditures, (c) scheduled debt payments, and (d) accounts receivable and payable; and (ii) the volume and cost of inventory and commodity imbalances. We may have working capital deficits in future periods as we continue to repay long-term debt. We do not expect a working capital deficit of this nature to have a material adverse impact to our cash flows or operations.

For additional information on our $2.5 Billion Credit Agreement, see Note F of the Notes to Consolidated Financial Statements in this Quarterly Report.

Long-term Financing - In addition to our principal sources of short-term liquidity discussed above, we expect to fund our longer-term financing requirements by issuing long-term notes, as needed. Other options to obtain financing include, but are not limited to, issuing common stock, loans from financial institutions, issuance of convertible debt securities or preferred equity securities, asset securitization and the sale and lease-back of facilities.

Debt Issuances - In August 2023, we completed an underwritten public offering of $5.25 billion senior unsecured notes consisting of $750 million, 5.55% senior notes due 2026; $750 million, 5.65% senior notes due 2028; $500 million, 5.80% senior notes due 2030; $1.5 billion, 6.05% senior notes due 2033; and $1.75 billion, 6.625% senior notes due 2053. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $5.2 billion. The net proceeds were used to fund the cash consideration and other costs related to the Magellan Acquisition. In connection with the underwritten public offering, we terminated the undrawn commitment letter for the $5.25 billion unsecured 364-day bridge loan facility.

Debt Repayments - In June 2023, we redeemed our $500 million, 7.5% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

In June 2023, we made an equity contribution of $105 million to Roadrunner, which, in combination with an equal contribution from our joint venture partner, was used to repay Roadrunner’s outstanding debt.

In February 2023, we redeemed our $425 million, 5.0% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

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For additional information on our long-term debt, see Note F of the Notes to Consolidated Financial Statements in this Quarterly Report.

Equity Issuances - On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash, for a total consideration of $14.1 billion. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition.

Capital Expenditures - We classify expenditures that are expected to generate additional revenue, return on investment or significant operating or environmental efficiencies as growth capital expenditures. Maintenance capital expenditures are those capital expenditures required to maintain our existing assets and operations and do not generate additional revenues. Maintenance capital expenditures are made to replace partially or fully depreciated assets, to maintain the existing operating capacity of our assets and to extend their useful lives. We proactively monitor lead times on materials and equipment used in constructing capital projects, and we enter into supply agreements for long-lead items for potential projects to plan for future growth. Our capital expenditures are financed typically through operating cash flows and short- and long-term debt.

Capital expenditures, excluding AFUDC, were $992 million and $886 million for the nine months ended September 30, 2023 and 2022, respectively.

We expect total capital expenditures, excluding AFUDC and capitalized interest, of $1.475-$1.675 billion in 2023. This range excludes the impact of the Magellan Acquisition.

Credit Ratings - Our long-term debt credit ratings as of October 23, 2023, are shown in the table below:

Rating Agency	Long-Term Rating	Short-Term Rating	Outlook
Moody’s	Baa2	Prime-2	Stable
S&P	BBB	A-2	Stable
Fitch (a)	BBB	F2	Stable

(a) Rating does not apply to Magellan’s long-term debt as Fitch does not currently rate these notes.

Our credit ratings, which are investment grade, may be affected by our leverage, liquidity, credit profile or potential transactions. Subsequent to the Magellan Acquisition, Moody’s and S&P updated the rating on Magellan’s long-term debt to match the ratings on ONEOK’s long-term debt. In April 2023, Moody’s upgraded the rating on our long-term debt to Baa2 from Baa3, the rating on our short-term debt to Prime-2 from Prime-3 and changed the outlook to stable from positive. The most common criteria for assessment of our credit ratings are the debt-to-EBITDA ratio, interest coverage, business risk profile and liquidity. If our credit ratings were downgraded, our cost to borrow funds under our $2.5 Billion Credit Agreement could increase and a potential loss of access to the commercial paper market could occur. In the event that we are unable to borrow funds under our commercial paper program and there has not been a material adverse change in our business, we would continue to have access to our $2.5 Billion Credit Agreement, which expires in 2027. An adverse credit rating change alone is not a default under our $2.5 Billion Credit Agreement.

In the normal course of business, our counterparties provide us with secured and unsecured credit. In the event of a downgrade in our credit ratings or a significant change in our counterparties’ evaluation of our creditworthiness, we could be required to provide additional collateral in the form of cash, letters of credit or other negotiable instruments as a condition of continuing to conduct business with such counterparties. We may be required to fund margin requirements with our counterparties with cash, letters of credit or other negotiable instruments.

Dividends - Holders of our common stock share equally in any common stock dividends declared by our Board of Directors, subject to the rights of the holders of outstanding preferred stock. In February, May and August 2023, we paid a common stock dividend of $0.955 per share ($3.82 per share on an annualized basis), an increase of 2% compared with the same quarters in the prior year. A common stock dividend of $0.955 per share was declared in October 2023 for the shareholders of record at the close of business on November 1, 2023, payable November 14, 2023.

Our Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when, as and if declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $0.3 million in February, May and August 2023. Dividends totaling $0.3 million were declared in October 2023 for the Series E Preferred Stock and are payable November 14, 2023.

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For the nine months ended September 30, 2023, our cash flows from operations exceeded dividends paid by $1.6 billion, due in part to the insurance proceeds received from the Medford settlement in the first quarter. We expect our cash flows from operations to continue to sufficiently fund our cash dividends. To the extent operating cash flows are not sufficient to fund our dividends, we may utilize cash on hand from other sources of short- and long-term liquidity to fund a portion of our dividends.

CASH FLOW ANALYSIS

We use the indirect method to prepare our Consolidated Statements of Cash Flows. Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that affect net income but do not result in actual cash receipts or payments during the period and for operating cash items that do not impact net income. These reconciling items can include depreciation and amortization, deferred income taxes, impairment charges, allowance for equity funds used during construction, gain or loss on sale of assets, net undistributed earnings from equity-method investments, share-based compensation expense, other amounts and changes in our assets and liabilities not classified as investing or financing activities.

The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

					Variances
	Nine Months Ended				2023 vs. 2022
	September 30,				$ Increase (Decrease) in Cash
	2023		2022
	(Millions of dollars)
Total cash provided by (used in):
Operating activities	$	2,913	$	1,866	$	1,047
Investing activities	(5,759)		(864)		(4,895)
Financing activities	2,910		(1,126)		4,036
Change in cash and cash equivalents	64		(124)		188
Cash and cash equivalents at beginning of period	220		146		74
Cash and cash equivalents at end of period	$	284	$	22	$	262

Operating Cash Flows - Operating cash flows are affected by earnings from our business activities and changes in our operating assets and liabilities. Changes in commodity prices and demand for our services or products, whether because of general economic conditions, changes in supply, changes in demand for the end products that are made with our products or increased competition from other service providers, could affect our earnings and operating cash flows. Our operating cash flows can also be impacted by changes in our inventory balances, which are driven primarily by commodity prices, supply, demand and the operation of our assets.

Cash flows from operating activities, before changes in operating assets and liabilities for the nine months ended September 30, 2023, increased $787 million compared with the same period in 2022, due primarily to insurance proceeds received from the Medford settlement, and higher operating income resulting from higher exchange services in our Natural Gas Liquids segment, higher volumes from increased production and higher average fee rates in our Natural Gas Gathering and Processing segment, higher transportation and storage services in our Natural Gas Pipelines segment, and an increase due to the impact of the Magellan Acquisition in our Refined Products and Crude segment, as discussed in “Financial Results and Operating Information.”

The changes in operating assets and liabilities increased operating cash flows $30 million for the nine months ended September 30, 2023, compared with a decrease of $230 million for the same period in 2022. This change is due primarily to changes in accounts receivable resulting from the timing of receipt of cash from counterparties and from inventory, both of which vary from period to period, and with changes in commodity prices; offset partially by changes in accounts payable, which also vary from period to period with changes in commodity prices, and from the timing of payments to vendors, suppliers and other third parties.

Investing Cash Flows - Cash used in investing activities for the nine months ended September 30, 2023, increased $4.9 billion, compared with the same period in 2022, due primarily to the $5.0 billion of cash paid for the Magellan Acquisition, net of cash received, offset partially by insurance proceeds received from the Medford settlement.

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Financing Cash Flows - Cash from financing activities for the nine months ended September 30, 2023, increased $4.0 billion, compared with the same period in 2022, due primarily to the issuance of $5.25 billion senior unsecured notes associated with the Magellan Acquisition, offset partially by short-term borrowings in 2022.

REGULATORY, ENVIRONMENTAL AND SAFETY MATTERS

Information about our regulatory, environmental and safety matters can be found in “Regulatory, Environmental and Safety Matters” under Part I, Item 1, Business, in our Annual Report.

IMPACT OF NEW ACCOUNTING STANDARDS

See Note A of the Notes to Consolidated Financial Statements in this Quarterly Report for discussion of new accounting standards.

CRITICAL ACCOUNTING ESTIMATES

The preparation of our Consolidated Financial Statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements. These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates.

Fair Value Estimates in Business Combination Accounting - Business combination accounting requires that assets and liabilities be recorded at their estimated fair value in connection with the initial recognition of the transaction. Estimating the fair value of assets and liabilities in connection with business combination accounting requires management to make estimates, assumptions and judgments, and in some cases management may also utilize third-party specialists to assist and advise on those estimates.

In order to estimate the fair value of acquired assets and assumed liabilities, we utilized widely accepted valuation techniques that included market and discounted cash flow approaches. These approaches utilize assumptions that include, but are not limited to, estimated future cash flows, discount rates applied to estimated future cash flows, and estimated asset replacement costs. While we believe we have made reasonable assumptions to estimate the fair value, these assumptions are inherently uncertain.

The purchase price allocation recorded in a business combination may change during the measurement period, which is a period not to exceed one year from the date of acquisition, as additional information about conditions existing at the acquisition date becomes available.

Additional information about our critical accounting estimates is included under Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, “Critical Accounting Policies and Estimates,” in our Annual Report.

FORWARD-LOOKING STATEMENTS

This Quarterly Report contains forward-looking statements in reliance on the safe harbor protections of the Securities Act of 1933, as amended, and the Exchange Act, which involve substantial risk and uncertainties. The forward-looking statements relate to our anticipated financial performance (including projected operating income, net income, capital expenditures, cash flows and projected levels of dividends), liquidity, management’s plans and objectives for our future capital projects and other future operations (including plans to construct additional natural gas and NGL pipelines, processing and fractionation facilities and related cost estimates), our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters. The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements and other statements in this Quarterly Report regarding our environmental, social and other sustainability targets, plans and goals are not an indication that these statements are required to be disclosed in our filings with the SEC, or that we will continue to make similar statements in the same extent or manner in future filings. In addition, historical, current and forward-looking environmental, social and sustainability-related statements may be based on standards and processes for measuring progress that are still developing and that continue to evolve, and assumptions that are subject to change in the future.

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Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained in this Quarterly Report identified by words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “guidance,” “intend,” “may,” “might,” “outlook,” “plan,” “potential,” “project,” “scheduled,” “should,” “target,” “will,” “would,” and other words and terms of similar meaning.

One should not place undue reliance on forward-looking statements. Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements. Those factors may affect our operations, markets, products, services and prices. In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

•the impact of inflationary pressures, including increased interest rates, which may increase our capital expenditures and operating costs, raise the cost of capital or depress economic growth;

•the impact on drilling and production by factors beyond our control, including the demand for natural gas, NGLs, Refined Products and crude oil; producers’ desire and ability to drill and obtain necessary permits; regulatory compliance; reserve performance; and capacity constraints and/or shut downs on the pipelines that transport crude oil, natural gas, Refined Products and NGLs from producing areas and our facilities;

•risks associated with adequate supply to our gathering, processing, fractionation, pipeline and terminal facilities, including production declines that outpace new drilling, the shutting-in of production by producers, actions taken by federal, state or local governments to require producers to prorate or to cut their production levels as a way to address any excess market supply situations or extended periods of ethane rejection;

•demand for our services and products in the proximity of our facilities;

•economic climate and growth in the geographic areas in which we operate;

•the risk of a slowdown in growth or decline in the United States or international economies, including liquidity risks in United States or foreign credit markets;

•risks related to the Magellan Acquisition, including litigation risk and the risk that we may not realize the anticipated benefits of the Magellan Acquisition or successfully integrate the two companies;

•international terrorism and conflicts and the possibility or occurrence of an outbreak of, or changes in, hostilities or changes in the political conditions and conflicts throughout the world;

•performance of contractual obligations by our customers, service providers, contractors and shippers;

•the effects of changes in governmental policies and regulatory actions, including changes with respect to income and other taxes, pipeline safety, environmental compliance, cybersecurity, climate change initiatives, emissions credits, carbon offsets, carbon pricing, production limits and authorized rates of recovery of natural gas and natural gas transportation costs;

•changes in demand for the use of natural gas, NGLs, Refined Products and crude oil because of the development of new technologies or other market conditions caused by concerns about climate change;

•the impact of the transformation to a lower-carbon economy, including the timing and extent of the transformation, as well as the expected role of different energy sources, including natural gas, NGLs, Refined Products and crude oil, in such a transformation;

•the pace of technological advancements and industry innovation, including those focused on reducing GHG emissions and advancing other climate-related initiatives, and our ability to take advantage of those innovations and developments;

•the effectiveness of our risk-management function, including mitigating cyber- and climate-related risks;

•our ability to identify and execute opportunities, and the economic viability of those opportunities, including those relating to renewable natural gas, carbon capture, use and storage, other renewable energy sources such as solar and wind and alternative low carbon fuel sources such as hydrogen;

•the ability of our existing assets and our ability to apply and continue to develop our expertise to support the growth of, and transformation to, various renewable and alternative energy opportunities, including through the positioning and optimization of our assets;

•our ability to efficiently reduce our GHG emissions (both Scope 1 and 2 emissions), including through the use of lower carbon power alternatives, management practices and system optimizations;

•the necessity to focus on maintaining and enhancing our existing assets while reducing our Scope 1 and 2 GHG emissions;

•the effects of weather and other natural phenomena and the effects of climate change (including physical and transformation-related effects) on our operations, demand for our services and commodity prices;

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•acts of nature, sabotage, terrorism or other similar acts that cause damage to our facilities or our suppliers’, customers’ or shippers’ facilities;

•the inability of insurance proceeds to cover all liabilities or incurred costs and losses, or lost earnings, resulting from a loss;

•delays in receiving insurance proceeds from covered losses;

•the risk of increased costs for insurance premiums, or less favorable coverage;

•increased costs as a consequence of terrorist attacks, including security related measures;

•the timing and extent of changes in energy commodity prices, including changes due to production decisions by other countries, such as the failure of countries to abide by agreements to reduce production volumes;

•competition from other United States and foreign energy suppliers and transporters, as well as alternative forms of energy, including, but not limited to, solar power, wind power, geothermal energy and biofuels such as ethanol and biodiesel;

•the ability to market pipeline capacity on favorable terms, including the effects of:

–    future demand for and prices of natural gas, NGLs and Refined Products and crude oil;

–    competitive conditions in the overall energy market;

–    availability of supplies of United States natural gas and crude oil; and

–    availability of additional storage capacity;

•the efficiency of our plants in processing natural gas and extracting and fractionating NGLs;

•the composition and quality of the natural gas, NGLs and condensate we gather and process in our plants and transport on our pipelines;

•risks of marketing, trading and hedging activities, including the risks of changes in commodity prices or the financial condition of our counterparties;

•our ability to control operating costs and make cost-saving changes;

•the risks inherent in the use of information systems in our respective businesses and those of our counterparties and service providers, including cyber-attacks, which, according to experts, have increased in volume and sophistication since the beginning of the COVID-19 (Coronavirus disease 2019, including variants thereof) pandemic; implementation of new software and hardware; and the impact on the timeliness of information for financial reporting;

•the timely receipt of approval by applicable governmental entities for construction and operation of our pipeline and other projects and required regulatory clearances;

•the ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our state and FERC-regulated rates;

•the results of governmental actions, administrative proceedings and litigation, regulatory actions, executive orders, rule changes and receipt of expected clearances involving any local, state or federal regulatory body, including the FERC, the National Transportation Safety Board, Homeland Security, the PHMSA, the EPA, the SEC, Homeland Security’s Transportation Security Administration, and the CFTC;

•the mechanical integrity of facilities and pipelines operated;

•the capital-intensive nature of our businesses;

•the impact of unforeseen changes in interest rates, debt and equity markets, inflation rates, economic recession and other external factors over which we have no control, including the effect on pension and postretirement expense and funding resulting from changes in equity and bond market returns;

•actions by rating agencies concerning our credit;

•our indebtedness and guarantee obligations could cause adverse consequences, including making us vulnerable to general adverse economic and industry conditions, limiting our ability to borrow additional funds and placing us at competitive disadvantages compared with our competitors that have less debt;

•our ability to access capital at competitive rates or on terms acceptable to us;

•our ability to acquire all necessary permits, consents or other approvals in a timely manner, to promptly obtain all necessary materials and supplies required for construction, and to construct gathering, processing, fractionation, transportation and storage facilities without labor or contractor problems;

•our ability to control construction costs and completion schedules of our pipelines and other projects;

•difficulties or delays experienced by trucks, railroads or pipelines in delivering products to or from our terminals or pipelines;

•the uncertainty of estimates, including accruals and costs of environmental remediation;

•the impact of uncontracted capacity in our assets being greater or less than expected;

•the impact of potential impairment charges;

•the profitability of assets or businesses acquired or constructed by us;

•the risks associated with pending or possible acquisitions and dispositions, including our ability to finance or integrate any such acquisitions and any regulatory delay or conditions imposed by regulatory bodies in connection with any such acquisitions and dispositions;

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•the risk that material weaknesses or significant deficiencies in our internal controls over financial reporting could emerge or that minor problems could become significant;

•the impact and outcome of pending and future litigation;

•the impact of recently issued and future accounting updates and other changes in accounting policies; and

•the risk factors listed in the reports we have filed, which are incorporated by reference, and may file with the SEC.

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements. Other factors could also affect adversely our future results. These and other risks are described in greater detail in Part I, Item 1A, Risk Factors, in our Annual Report and in our other filings that we make with the SEC, which are available via the SEC’s website at www.sec.gov and our website at www.oneok.com. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Any such forward-looking statement speaks only as of the date on which such statement is made, and other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

COMMODITY PRICE RISK

As part of our hedging strategy, we use commodity derivative financial instruments and physical-forward contracts described in Note E of the Notes to Consolidated Financial Statements in this Quarterly Report to reduce the impact of near-term price fluctuations of natural gas, NGLs, Refined Products, condensate and crude oil.

Although our businesses are primarily fee-based, in our Natural Gas Gathering and Processing segment, we are exposed to commodity price risk as a result of retaining a portion of the commodity sales proceeds associated with our fee with POP contracts. Under certain fee with POP contracts, our contractual fees and POP percentage may increase or decrease if production volumes, delivery pressures or commodity prices change relative to specified thresholds. We are exposed to basis risk between the various production and market locations where we buy and sell commodities.

As a result of the Magellan Acquisition, in our Refined Products and Crude segment we are exposed to commodity price risk from our liquids blending, fractionation and marketing activities, as well as product retained during the operations of our pipelines and terminals.

Except for the Magellan Acquisition, there have been no material changes in market risk exposures that would affect the quantitative and qualitative disclosures presented as of December 31, 2022, in Part II, Item 7A in our Annual Report.

The following table presents the effect a hypothetical 10% change in the underlying commodity prices would have on the estimated fair value of our commodity derivative instruments as of the dates indicated:

Commodity Contracts	September 30, 2023		December 31, 2022
	(Millions of dollars)
Refined Products, crude oil and NGLs	$	88	$	35
Natural gas	7		18
Total change in estimated fair value of commodity contracts	$	95	$	53

Our sensitivity analysis represents an estimate of the reasonably possible gains and losses that would be recognized on our commodity derivative contracts assuming hypothetical movements in future market prices and is not necessarily indicative of actual results that may occur. Actual gains and losses may differ from estimates due to actual fluctuations in market prices, as well as changes in our commodity derivative portfolio during the year.

47

The following tables set forth hedging information for our Natural Gas Gathering and Processing segment’s forecasted equity volumes for the periods indicated:

	Three Months Ending December 31, 2023
	Volumes Hedged	Average Price			Percentage Hedged
NGLs - excluding ethane (MBbl/d) - Conway/Mont Belvieu	9.3	$	1.26	/ gallon	68%
Condensate (MBbl/d) - WTI-NYMEX	1.6	$	84.90	/ Bbl	69%
Natural gas (BBtu/d) - NYMEX and basis	82.4	$	3.54	/ MMBtu	73%

	Year Ending December 31, 2024
	Volumes Hedged	Average Price			Percentage Hedged
NGLs - excluding ethane (MBbl/d) - Conway/Mont Belvieu	4.4	$	0.80	/ gallon	34%
Condensate (MBbl/d) - WTI-NYMEX	0.9	$	75.39	/ Bbl	38%
Natural gas (BBtu/d) - NYMEX and basis	50.4	$	4.52	/ MMBtu	41%

INTEREST-RATE RISK

We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt, Treasury locks and interest-rate swaps. Treasury locks are agreements to pay the difference between the benchmark Treasury rate and the rate that is designated in the terms of the agreement. In the third quarter 2023, we settled all of our $1.1 billion Treasury locks related to our underwritten public offering of $5.25 billion senior unsecured notes associated with the Magellan Acquisition. At September 30, 2023, we had no outstanding Treasury lock agreements.

Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts. In the third quarter 2023, we settled all of our $0.4 billion forward-starting interest-rate swaps related to our underwritten public offerings of $5.25 billion senior unsecured notes associated with the Magellan Acquisition. At September 30, 2023, we had no outstanding forward-starting interest-rate swaps.

See Note E of the Notes to Consolidated Financial Statements in this Quarterly Report for more information on our hedging activities.

ITEM 4.CONTROLS AND PROCEDURES

Quarterly Evaluation of Disclosure Controls and Procedures - Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rules 13a-15(b) and 15d-15(b) of the Exchange Act.

Changes in Internal Control Over Financial Reporting - On September 25, 2023, we completed the Magellan Acquisition. As part of the ongoing integration of the acquisition, we are in the process of incorporating the controls and related procedures. Except for the Magellan Acquisition, there have been no changes in our internal control over financial reporting during the quarter ended September 30, 2023, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II - OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

We have elected to use a $1 million threshold for disclosing environmental proceedings.

Information about our legal proceedings is included in Note K of the Notes to Consolidated Financial Statements in this Quarterly Report and under Note O of the Notes to Consolidated Financial Statements in our Annual Report.

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ITEM 1A.RISK FACTORS

Reduced volatility in energy prices or new government regulations could discourage our storage customers from holding positions in Refined Products and crude oil, which could adversely affect our business.

The demand for the storage services acquired as part of the Magellan Acquisition has resulted in part from customers’ desire to have the ability to take advantage of profit opportunities created by the volatility in prices of Refined Products and crude oil. Periods of prolonged stability or declines in Refined Product and crude oil prices could reduce demand for our storage services. If federal, state or international regulations are passed that discourage our customers from storing these commodities, demand for our storage services could decrease, in which case we may be unable to identify customers willing to contract for such services or be forced to reduce the rates we charge for our services. The realization of any of these risks could adversely affect our business.

We depend on producers, gathering systems, refineries and pipelines owned and operated by others to supply our assets in our Refined Products and Crude segment, and any closures, interruptions or reduced activity levels at these facilities may adversely affect our business.

Following the Magellan Acquisition, we depend on crude oil production and on connections with gathering systems, refineries and pipelines owned and operated by third parties to supply our assets in our Refined Products and Crude segment. We cannot control or predict the amount of crude oil that will be delivered to us by the gathering systems and pipelines that supply our crude oil assets, nor can we control or predict the output of refineries that supply our Refined Products pipelines and terminals. Changes in the quality or quantity of this crude oil production, outages at these refineries or reduced or interrupted throughput on these gathering systems or pipelines due to weather-related or other natural causes, competitive forces, testing, line repair, damage, reduced operating pressures or other causes could reduce shipments on our pipelines or result in our being unable to receive products at or deliver products from our terminals or receive products for processing at our condensate splitter, any of which could adversely affect our business.

Refineries that supply or are supplied by our facilities are subject to regulatory developments, including but not limited to low carbon fuel standards, regulations regarding fuel specifications, plant emissions and safety and security requirements that could significantly increase the cost of their operations and reduce their operating margins. In addition, the profitability of the refineries that supply our facilities is subject to regional and global supply and demand dynamics that are difficult to predict. A period of sustained weak demand or increased costs could make refining uneconomic for some refineries, including those directly or indirectly connected to our Refined Products and crude oil pipelines. The closure of a refinery that delivers product to or receives crude oil from our pipelines could reduce the volumes we transport. Further, the closure of these or other refineries could result in our customers electing to store and distribute Refined Products and crude oil through their proprietary terminals, which could result in a reduction in demand for our storage services.

Rate regulation, challenges by shippers of the rates we charge for transportation on our pipelines or changes in the jurisdictional characterization of our assets or activities by federal, state or local regulatory agencies may reduce the amount of cash we generate.

The FERC regulates the rates we can charge and the terms and conditions we can offer for interstate transportation service on our pipelines. State regulatory authorities regulate the rates we can charge and the terms and conditions we can offer for intrastate movements on our pipelines. The determination of the interstate or intrastate character of shipments on our pipelines may change over time, which may change the regulatory framework and the rates we are allowed to charge for transportation and other related services. Shippers may protest our pipeline tariff filings, and the FERC or state regulatory authorities may investigate and require changes to tariff terms as a result of the protests or complaints. Further, other than for rates set under market-based rate authority, the FERC may order refunds of amounts collected under interstate rates that are determined to be in excess of a just and reasonable level. State regulatory authorities could take similar measures for intrastate tariffs. In addition, shippers may challenge by complaint the lawfulness of tariff rates that have become final and effective. If existing rates are determined to be in excess of a just and reasonable level, we could be required to pay refunds to shippers, reduce rates and make other concessions.

The FERC’s ratemaking methodologies may limit our ability to increase rates by amounts sufficient to reflect our actual cost or may delay the use of rates that reflect increased costs. We use the FERC’s indexing methodology to establish our rates in approximately 30% of the markets serviced by our Refined Products pipelines. The FERC’s indexing methodology is subject to review every five years and currently allows a pipeline to change its rates each year to a new ceiling level. When the change in the ceiling level is negative, we are required to reduce our rates that are subject to the FERC’s indexing methodology.

49

The FERC and most relevant state regulatory authorities allow us to establish rates based on conditions in competitive markets without regard to the FERC’s index level or our cost-of-service. We establish market-based rates in approximately 70% of the markets for our Refined Products pipelines. The tariffs on most of our long-haul crude oil pipelines are at negotiated rates, but are still subject to regulation by the FERC or state agencies and subject to protest by shippers. If we were to lose our market-based rate authority, or if our negotiated rates were determined to not be just and reasonable, we could be required to establish rates on some other basis, such as our cost-of-service. Establishing our rates through a cost-of-service filing could be expensive and could result in tariff reductions, which would adversely affect our business.

Our gas liquids blending activities subject us to federal regulations that govern renewable fuel requirements in the U.S.

The Energy Independence and Security Act of 2007 expanded the required use of renewable fuels in the U.S. Each year, the EPA establishes a renewable volume obligation (“RVO”) requirement for refiners and fuel manufacturers based on overall quotas established by the federal government. By virtue of our gas liquids blending activity and resulting gasoline production, we are an obligated party and receive an annual RVO from the EPA. We typically purchase renewable energy credits, called RINs, to meet this obligation. Increases in the cost or decreases in the availability of RINs could have an adverse impact on our business.

Our business could be affected adversely by union disputes and strikes or work stoppages by our unionized employees.

As of September 25, 2023, approximately 4% of our workforce was represented by the United Steelworkers and covered by a collective bargaining agreement expiring January 2026. We could experience a work stoppage in the future as a result of disagreements with the labor union. A prolonged work stoppage could have an adverse effect on our business.

The failure to successfully combine the businesses of ONEOK and Magellan may adversely affect our future results.

The success of the Magellan Acquisition will depend, in part, on our ability to realize the anticipated benefits from combining the businesses of ONEOK and Magellan. To realize these anticipated benefits, ONEOK’s and Magellan’s businesses must be successfully combined. If the businesses are not successfully combined, the anticipated benefits of the Magellan Acquisition may not be realized fully or at all or may take longer to realize than expected. In addition, the integration may result in additional and unforeseen expenses, which could reduce the anticipated benefits of the Magellan Acquisition. It is possible that the integration process could result in the loss of key employees, as well as the disruption of our ongoing businesses or inconsistencies in our standards, controls, procedures and policies. Any or all of those occurrences could affect adversely the combined company’s ability to maintain relationships with customers and employees after the Magellan Acquisition or to achieve the anticipated benefits of the Magellan Acquisition. Integration efforts between the two companies will also divert management attention and resources. These integration matters could have an adverse effect on us.

Securities class action lawsuits and derivative lawsuits are often brought against public companies that have entered into acquisition, merger or other business combination agreements. Even if such a lawsuit is without merit, defending against these claims can result in substantial costs and divert management time and resources. An adverse judgment could result in monetary damages, which could have a negative impact on our liquidity and financial condition. Lawsuits that may be brought against us or our directors could also seek, among other things, injunctive relief or other equitable relief. Additionally, the defense or settlement of any lawsuits or claims against us or Magellan that were unresolved at the time of the Magellan Acquisition could affect adversely the combined company’s business, results of operations, financial condition or cash flows.

Our investors should consider the risks set forth in Part I, Item 1A, Risk Factors, of our Annual Report that could affect us and our business. Although we have tried to discuss key factors, our investors need to be aware that other risks may prove to be important in the future. New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance. Investors should consider carefully the discussion of risks and the other information included or incorporated by reference in this Quarterly Report, including “Forward-Looking Statements,” which are included in Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Not applicable.

ITEM 3.DEFAULTS UPON SENIOR SECURITIES

Not applicable.

50

ITEM 4.MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5.OTHER INFORMATION

Not applicable.

ITEM 6.EXHIBITS

Readers of this report should not rely on or assume the accuracy of any representation or warranty or the validity of any opinion contained in any agreement filed as an exhibit to this Quarterly Report, because such representation, warranty or opinion may be subject to exceptions and qualifications contained in separate disclosure schedules, may represent an allocation of risk between parties in the particular transaction, may be qualified by materiality standards that differ from what may be viewed as material for securities law purposes, or may no longer continue to be true as of any given date. All exhibits attached to this Quarterly Report are included for the purpose of complying with requirements of the SEC. Other than the certifications made by our officers pursuant to the Sarbanes-Oxley Act of 2002 included as exhibits to this Quarterly Report, all exhibits are included only to provide information to investors regarding their respective terms and should not be relied upon as constituting or providing any factual disclosures about us, any other persons, any state of affairs or other matters.

The following exhibits are filed as part of this Quarterly Report:

Exhibit No.	Exhibit Description
3.1	Amended and Restated Certificate of Incorporation of ONEOK, Inc., dated July 3, 2017, as amended (incorporated by reference from Exhibit 3.2 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, filed November 1, 2017 (File No. 1-13643)).
3.2	Amended and Restated By-laws of ONEOK, Inc. (incorporated by reference from Exhibit 3.1 to ONEOK Inc.’s Current Report on Form 8-K filed, February 24, 2023 (File No. 1-13643)).
4.1	Twentieth Supplemental Indenture, dated as of August 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.550% Notes due 2026 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 25, 2023 (File No. 1-13643)).
4.2	Twenty-First Supplemental Indenture, dated as of August 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.650% Notes due 2028 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 25, 2023 (File No. 1-13643)).
4.3	Twenty-Second Supplemental Indenture, dated as of August 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 5.800% Notes due 2030 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 25, 2023 (File No. 1-13643)).
4.4	Twenty-Third Supplemental Indenture, dated as of August 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 6.050% Notes due 2033 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 25, 2023 (File No. 1-13643)).
4.5	Twenty-Fourth Supplemental Indenture, dated as of August 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank National Association, as trustee, with respect to the 6.625% Notes due 2053 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 25, 2018 (File No. 1-13643)).
4.6	Sixth Supplemental Indenture, dated as of September 25, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).

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4.7	Fifth Supplemental Indenture, dated as of September 25, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
4.8	Twenty-Fifth Supplemental Indenture, dated as of September 25, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
4.9	Sixteenth Supplemental Indenture, dated as of September 25, 2023, among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P. and Computershare Trust Company, N.A., as trustee (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
4.10	Second Supplemental Indenture, dated as of September 25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
4.11	Twelfth Supplemental Indenture, dated as of September 25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.6 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
10.1	Equity Distribution Agreement, dated August 3, 2023, among ONEOK, Inc., BofA Securities, Inc., as sales agent, principal and/or forward seller, and Bank of America, N.A., as forward purchaser (incorporated by reference from Exhibit 1.1 to ONEOK Inc.’s Current Report on Form 8-K, filed August 3, 2023 (File No. 1-13643)).
10.2	Guaranty Agreement, dated as of September 25, 2023, by and between Magellan Midstream Partners, L.P., in favor of Citibank, N.A., as administrative agent, under the Credit Agreement, dated as of June 10, 2022, by and among ONEOK, Inc., Citibank, N.A. and the other lenders (incorporated by reference from Exhibit 10.1 to ONEOK Inc.’s Current Report on Form 8-K, filed September 25, 2023 (File No. 1-13643)).
22.1	List of subsidiary guarantors and issuers of guaranteed securities.
31.1	Certification of Pierce H. Norton II pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Walter S. Hulse III pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Pierce H. Norton II pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
32.2	Certification of Walter S. Hulse III pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definitions Document.
101.LAB	Inline XBRL Taxonomy Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Presentation Linkbase Document.

52

104 Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101).

Attached as Exhibit 101 to this Quarterly Report are the following Inline XBRL-related documents: (i) Document and Entity Information; (ii) Consolidated Statements of Income for the three and nine months ended September 30, 2023 and 2022; (iii) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2023 and 2022; (iv) Consolidated Balance Sheets at September 30, 2023, and December 31, 2022; (v) Consolidated Statements of Cash Flows for the nine months ended September 30, 2023 and 2022; (vi) Consolidated Statements of Changes in Equity for the three and nine months ended September 30, 2023 and 2022; and (vii) Notes to Consolidated Financial Statements.

53

SIGNATURE

Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ONEOK, Inc.
	Registrant
Date: November 1, 2023	By:	/s/ Walter S. Hulse III
		Walter S. Hulse III
		Chief Financial Officer, Treasurer and
		Executive Vice President, Investor Relations
		and Corporate Development
		(Principal Financial Officer)

54

EX-22.1

Exhibit 22.1

List of Subsidiary Guarantors and Issuers

of Guaranteed Securities

As of September 30, 2023, the following entities guarantee the notes issued by ONEOK, Inc. (the “ONEOK Notes”), ONEOK Partners, L.P. (the “ONEOK Partners Notes”) and Magellan Midstream Partners, L.P. (the "Magellan Notes").

Entity	Jurisdiction of Incorporation or Organization	ONEOK Notes	ONEOK Partners Notes	Magellan Notes
ONEOK, Inc.	Oklahoma	Issuer	Guarantor	Guarantor
ONEOK Partners, L.P.	Delaware	Guarantor	Issuer	Guarantor
ONEOK Partners Intermediate Limited Partnership	Delaware	Guarantor	Guarantor	Guarantor
Magellan Midstream Partners, L.P.	Delaware	Guarantor	Guarantor	Issuer

As of September 30, 2023, the ONEOK Notes consisted of the following securities:

Issued under the Indenture dated as of September 24, 1998

6-7/8% Debentures due 2028

Issued under the Indenture dated as of December 28, 2001

6.00% Notes due 2035

Issued under the Indenture dated as of January 26, 2012

2.75% Notes due 2024

2.200% Notes due 2025

5.850% Notes due 2026

4.000% Notes due 2027

4.55% Notes due 2028

4.35% Notes due 2029

3.40% Notes due 2029

3.100% Notes due 2030

6.350% Notes due 2031

6.10% Notes due 2032

4.950% Notes due 2047

5.20% Notes due 2048

4.45% Notes due 2049

4.500% Notes due 2050

7.150% Notes due 2051

As of September 30, 2023, the ONEOK Partners Notes consisted of the following securities:

Issued under the Indenture dated as of September 25, 2006

4.90% Senior Notes due 2025

6.65% Senior Notes due 2036

6.85% Senior Notes due 2037

6.125% Senior Notes due 2041

6.200% Senior Notes due 2043

1

Exhibit 22.1

As of September 30, 2023, the Magellan Notes consisted of the following securities:

Issued under the Indenture dated as of April 19, 2007

6.40% Senior Notes due 2037

Issued under the Indenture dated as of August 11, 2010

3.20% Senior Notes due 2025

5.00% Senior Notes due 2026

3.25% Senior Notes due 2030

4.20% Senior Notes due 2042

5.15% Senior Notes due 2043

4.20% Senior Notes due 2045

4.25% Senior Notes due 2046

4.20% Senior Notes due 2047

4.85% Senior Notes due 2049

3.95% Senior Notes due 2050

2

EX-31.1

Exhibit 31.1

Certification

I, Pierce H. Norton II, certify that:

I have reviewed this quarterly report on Form 10-Q of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2023

/s/ Pierce H. Norton II

Pierce H. Norton II

Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

I, Walter S. Hulse III, certify that:

I have reviewed this quarterly report on Form 10-Q of ONEOK, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2023

/s/ Walter S. Hulse III

Walter S. Hulse III

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of ONEOK, Inc. (the “Registrant”) for the period ending September 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Pierce H. Norton II, Chief Executive Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ Pierce H. Norton II

Pierce H. Norton II

Chief Executive Officer

November 1, 2023

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of ONEOK, Inc. (the “Registrant”) for the period ending September 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Walter S. Hulse III, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ Walter S. Hulse III

Walter S. Hulse III

Chief Financial Officer

November 1, 2023

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONEOK, Inc. and will be retained by ONEOK, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 23, 2023
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-13643
Entity Registrant Name	ONEOK, Inc.
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1520922
Entity Address, Address Line One	100 West Fifth Street,
Entity Address, City or Town	Tulsa,
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74103
City Area Code	918
Local Phone Number	588-7000
Title of 12(b) Security	Common stock, par value of $0.01
Trading Symbol	OKE
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		582,550,734
Entity Central Index Key	0001039684
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Total revenues (Note L)	$ 4,189	$ 5,914	$ 12,442	$ 17,355
Cost of sales and fuel (exclusive of items shown separately below)	2,799	4,773	8,628	14,017
Operations and maintenance	308	238	833	683
Depreciation and amortization	177	157	509	469
General taxes	44	48	148	144
Transaction costs (Note B)	123	0	133	0
Other operating (income) expense, net (Note C)	(1)	(2)	(782)	(9)
Operating income	739	700	2,973	2,051
Equity in net earnings from investments (Note J)	49	39	132	111
Other income (expense), net	22	(8)	43	(30)
Interest expense (net of capitalized interest of $8, $17, $32, and $42, respectively)	(215)	(167)	(561)	(510)
Income before income taxes	595	564	2,587	1,622
Income taxes	(141)	(132)	(616)	(385)
Net income	454	432	1,971	1,237
Less: Preferred stock dividends	1	1	1	1
Net income available to common shareholders	$ 453	$ 431	$ 1,970	$ 1,236
Basic earnings per common share (in dollars per share)	$ 0.99	$ 0.96	$ 4.37	$ 2.76
Diluted earnings per common share (in dollars per share)	$ 0.99	$ 0.96	$ 4.36	$ 2.76
Average shares (millions)
Basic (in shares)	457.3	447.7	451.2	447.4
Diluted (in shares)	458.2	448.2	452.1	448.3
Commodity sales
Revenues
Total revenues (Note L)	$ 3,760	$ 5,564	$ 11,287	$ 16,320
Services
Revenues
Total revenues (Note L)	$ 429	$ 350	$ 1,155	$ 1,035

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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Capitalized interest	$ 8	$ 17	$ 32	$ 42

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 454	$ 432	$ 1,971	$ 1,237
Other comprehensive income (loss), net of tax
Change in fair value of derivatives, net of tax of $(3), $(31), $(25) and $(17), respectively	12	107	86	57
Derivative amounts reclassified to net income, net of tax of $4, $(16), $14 and $(57), respectively	(7)	54	(44)	190
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1), $(1), $(1) and $(3), respectively	2	3	3	9
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $—, $(1), $1 and $(5), respectively	0	3	(5)	16
Total other comprehensive income, net of tax	7	167	40	272
Comprehensive income	$ 461	$ 599	$ 2,011	$ 1,509

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Change in fair value of derivatives, tax	$ (3)	$ (31)	$ (25)	$ (17)
Derivative amounts reclassified to net income, tax	4	(16)	14	(57)
Change in retirement and other postretirement benefit plan obligations, tax	(1)	(1)	(1)	(3)
Other comprehensive income (loss) of unconsolidated affiliates, tax	$ 0	$ (1)	$ 1	$ (5)

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 284	$ 220
Accounts receivable, net	1,571	1,532
Materials and supplies	142	149
Inventories	869	432
Commodity imbalances	22	43
Other current assets	300	172
Total current assets	3,188	2,548
Property, plant and equipment
Property, plant and equipment	37,626	25,015
Accumulated depreciation and amortization	5,537	5,063
Net property, plant and equipment	32,089	19,952
Other assets
Investments in unconsolidated affiliates	1,795	802
Goodwill	5,682	528
Intangible assets, net	861	225
Other assets	324	324
Total other assets	8,662	1,879
Total assets	43,939	24,379
Current liabilities
Current maturities of long-term debt (Note F)	500	925
Accounts payable	1,619	1,359
Commodity imbalances	248	254
Accrued taxes	220	136
Accrued interest	218	233
Operating lease liability	32	12
Other current liabilities	461	132
Total current liabilities	3,298	3,051
Long-term debt, excluding current maturities (Note F)	21,450	12,696
Deferred credits and other liabilities
Deferred income taxes	2,349	1,739
Operating lease liability	77	68
Other deferred credits	466	331
Total deferred credits and other liabilities	2,892	2,138
Commitments and contingencies (Note K)
Equity (Note G)
Preferred stock, $0.01 par value: authorized and issued 20,000 shares at September 30, 2023, and December 31, 2022		0
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 609,713,834 shares and outstanding 582,536,892 shares at September 30, 2023; issued 474,916,234 shares and outstanding 447,157,771 shares at December 31, 2022	6	5
Paid-in capital	16,315	7,253
Accumulated other comprehensive loss (Note H)	(68)	(108)
Retained earnings	737	50
Treasury stock, at cost: 27,176,942 shares at September 30, 2023, and 27,758,463 shares at December 31, 2022	(691)	(706)
Total equity	16,299	6,494
Total liabilities and equity	$ 43,939	$ 24,379

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Equity (Note G)
Preferred stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares, authorized (in shares)	20,000	20,000
Preferred stock, shares, issued (in shares)	20,000	20,000
Common stock, shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares, authorized (in shares)	1,200,000,000	1,200,000,000
Common stock, shares, issued (in shares)	609,713,834	474,916,234
Common stock, shares, outstanding (in shares)	582,536,892	447,157,771
Treasury stock, shares, (in shares)	27,176,942	27,758,463

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net income	$ 1,971	$ 1,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	509	469
Equity in net earnings from investments	(132)	(111)
Distributions received from unconsolidated affiliates	134	110
Deferred income taxes	599	345
Medford settlement gain	(779)	0
Medford settlement proceeds	502	0
Other, net	79	46
Changes in assets and liabilities:
Accounts receivable	153	(260)
Inventories, net of commodity imbalances	(104)	(165)
Accounts payable	38	296
Other assets and liabilities, net	(57)	(101)
Cash provided by operating activities	2,913	1,866
Investing activities
Capital expenditures (less allowance for equity funds used during construction)	(992)	(886)
Cash paid for Magellan Acquisition, net of cash acquired	(5,008)	0
Contributions to unconsolidated affiliates	(111)	(2)
Distributions received from unconsolidated affiliates in excess of cumulative earnings	18	18
Medford settlement proceeds	328	0
Other, net	6	6
Cash used in investing activities	(5,759)	(864)
Financing activities
Dividends paid	(1,283)	(1,253)
Short-term borrowings, net	0	901
Issuance of long-term debt, net of discounts	5,298	120
Debt financing costs	(71)	(1)
Repayment of long-term debt	(1,040)	(896)
Other, net	6	3
Cash provided by (used in) financing activities	2,910	(1,126)
Change in cash and cash equivalents	64	(124)
Cash and cash equivalents at beginning of period	220	146
Cash and cash equivalents at end of period	$ 284	$ 22

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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Shares, issued, beginning balance (in shares) at Dec. 31, 2021		20,000	474,916,234
Total equity, beginning balance at Dec. 31, 2021	$ 6,015		$ 5	$ 7,214	$ (472)	$ 0	$ (732)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	391					391
Other comprehensive income (Note H)	4				4
Preferred stock dividends	0
Common stock issued	6			(6)			12
Common stock dividends	(417)			(26)		(391)
Other, net	(5)			(5)
Shares, issued, ending balance (in shares) at Mar. 31, 2022		20,000	474,916,234
Total equity, ending balance at Mar. 31, 2022	5,994		$ 5	7,177	(468)	0	(720)
Shares, issued, beginning balance (in shares) at Dec. 31, 2021		20,000	474,916,234
Total equity, beginning balance at Dec. 31, 2021	6,015		$ 5	7,214	(472)	0	(732)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,237
Other comprehensive income (Note H)	272
Shares, issued, ending balance (in shares) at Sep. 30, 2022		20,000	474,916,234
Total equity, ending balance at Sep. 30, 2022	6,312		$ 5	7,218	(200)	0	(711)
Shares, issued, beginning balance (in shares) at Mar. 31, 2022		20,000	474,916,234
Total equity, beginning balance at Mar. 31, 2022	5,994		$ 5	7,177	(468)	0	(720)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	414					414
Other comprehensive income (Note H)	101				101
Preferred stock dividends	0
Common stock issued	14			7			7
Common stock dividends	(418)			(4)		(414)
Other, net	10			10
Shares, issued, ending balance (in shares) at Jun. 30, 2022		20,000	474,916,234
Total equity, ending balance at Jun. 30, 2022	6,115		$ 5	7,190	(367)	0	(713)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	432					432
Other comprehensive income (Note H)	167				167
Preferred stock dividends	(1)					(1)
Common stock issued	6			4			2
Common stock dividends	(418)			13		(431)
Other, net	11			11
Shares, issued, ending balance (in shares) at Sep. 30, 2022		20,000	474,916,234
Total equity, ending balance at Sep. 30, 2022	6,312		$ 5	7,218	(200)	0	(711)
Shares, issued, beginning balance (in shares) at Dec. 31, 2022		20,000	474,916,234
Total equity, beginning balance at Dec. 31, 2022	6,494		$ 5	7,253	(108)	50	(706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,049					1,049
Other comprehensive income (Note H)	9				9
Preferred stock dividends	0
Common stock issued	4			(3)			7
Common stock dividends	(427)					(427)
Other, net	3			3
Shares, issued, ending balance (in shares) at Mar. 31, 2023		20,000	474,916,234
Total equity, ending balance at Mar. 31, 2023	7,132		$ 5	7,253	(99)	672	(699)
Shares, issued, beginning balance (in shares) at Dec. 31, 2022		20,000	474,916,234
Total equity, beginning balance at Dec. 31, 2022	6,494		$ 5	7,253	(108)	50	(706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,971
Other comprehensive income (Note H)	40
Shares, issued, ending balance (in shares) at Sep. 30, 2023		20,000	609,713,834
Total equity, ending balance at Sep. 30, 2023	16,299		$ 6	16,315	(68)	737	(691)
Shares, issued, beginning balance (in shares) at Mar. 31, 2023		20,000	474,916,234
Total equity, beginning balance at Mar. 31, 2023	7,132		$ 5	7,253	(99)	672	(699)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	468					468
Other comprehensive income (Note H)	24				24
Preferred stock dividends	0
Common stock issued	13			7			6
Common stock dividends	(429)					(429)
Other, net	10			10
Shares, issued, ending balance (in shares) at Jun. 30, 2023		20,000	474,916,234
Total equity, ending balance at Jun. 30, 2023	7,218		$ 5	7,270	(75)	711	(693)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	454					454
Other comprehensive income (Note H)	7				7
Preferred stock dividends	(1)					(1)
Magellan acquisition consideration (in shares)			134,797,600
Magellan Acquisition consideration	9,062		$ 1	9,061
Common stock issued	5			3			2
Common stock dividends	(427)					(427)
Other, net	(19)			(19)
Shares, issued, ending balance (in shares) at Sep. 30, 2023		20,000	609,713,834
Total equity, ending balance at Sep. 30, 2023	$ 16,299		$ 6	$ 16,315	$ (68)	$ 737	$ (691)

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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Preferred stock, dividends paid (in dollars per share)	$ 13.75	$ 13.75	$ 13.75	$ 13.75	$ 13.75	$ 13.75
Common stock dividends paid (in dollars per share)	$ 0.955	$ 0.955	$ 0.955	$ 0.935	$ 0.935	$ 0.935

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

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 statement of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2022 year-end Consolidated Balance Sheet data was derived from our audited Consolidated Financial Statements but does not include all disclosures required by GAAP. Certain reclassifications have been made in the prior year Consolidated Financial Statements to conform to the current year presentation. These unaudited Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements in our Annual Report.

Goodwill Impairment Review - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. At July 1, 2023, we assessed qualitative factors to determine whether it was more likely than not that the fair value of each of our reporting units with goodwill was less than its carrying amount. After assessing qualitative factors (including macroeconomic conditions, industry and market considerations, costs and overall financial performance), we determined that it was more likely than not that the fair value of the Natural Gas Pipelines and Natural Gas Liquids reporting units were not less than their respective carrying value, that no further testing was necessary and that goodwill was not considered impaired.

Recently Issued Accounting Standards Update - Changes to GAAP are established by the Financial Accounting Standards Board (FASB) in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. ASUs not discussed herein or in our Annual Report were assessed and determined to be either not applicable or clarifications of ASUs previously issued. There have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us.

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MAGELLAN ACQUISITION

9 Months Ended

Sep. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Magellan Acquisition

MAGELLAN ACQUISITION

On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. The acquisition strategically diversifies our complementary asset base and allows for significant expected synergies as a combined entity. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash, for a total consideration of $14.1 billion. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition. We funded the cash portion of the acquisition with an underwritten public offering of $5.25 billion senior unsecured notes. In connection with the underwritten public offering, we terminated the undrawn commitment letter for the $5.25 billion unsecured 364-day bridge loan facility. For additional information on our long-term debt, see Note F.

Magellan’s operations are principally composed of transportation, storage and distribution of Refined Products, certain NGLs and crude oil. The assets acquired consist of an approximately 9,800-mile Refined Products pipeline system with 54 terminals, including one marine storage terminal, and crude oil infrastructure with approximately 1,000 miles of pipelines, one condensate splitter and three storage terminals. We also acquired ownership interests in Magellan’s eight unconsolidated affiliates. In conjunction with the Magellan Acquisition, Magellan’s results of operations will be reported within our new Refined Products and Crude segment, consistent with how information is presented to our chief operating decision maker.

The Magellan Acquisition was accounted for using the acquisition method of accounting for business combinations pursuant to Accounting Standards Codification 805, “Business Combinations,” which requires, among other things, assets acquired and liabilities assumed to be recorded at their fair values on the acquisition date. Determining the fair value of acquired assets and liabilities assumed requires management’s judgment and the use of independent valuation specialists. The purchase price allocation presented below is preliminary, as certain data necessary to complete the purchase price allocation is not yet available, including, but not limited to, the final valuation of assets acquired and liabilities assumed. Management is also evaluating certain assumptions of assets acquired and liabilities assumed and may adjust the allocation in subsequent periods. The final valuation will be completed no later than one year from the acquisition date.

The following tables set forth the acquisition consideration and preliminary purchase price allocation of assets acquired and liabilities assumed:

	At September 25, 2023
	(Millions of dollars and shares/units, except per share/unit data)
Magellan public common units outstanding	202.1
Cash consideration per Magellan unit	$25.00
Cash consideration	$	5,052
Magellan public common units outstanding	202.1
ONEOK exchange ratio per Magellan unit	0.667
Shares of ONEOK common stock issued	134.8
ONEOK common stock closing price on September 25, 2023	$66.54
Fair value of common stock issued	$	8,969
Fair value of Magellan replacement equity awards	93
Equity consideration	$	9,062
Total consideration	$	14,114

	At September 25, 2023
Assets acquired:	(Millions of dollars)
Cash and cash equivalents	$	44
Accounts receivables, net	245
Inventories	348
Other current assets	65
Property, plant and equipment	11,562
Investments in unconsolidated affiliates	909
Intangible assets	645
Other assets	112
Total assets acquired	13,930
Liabilities assumed:
Accounts payable	221
Other current liabilities	533
Long-term debt, excluding current maturities	4,013
Other deferred credits and liabilities	203
Total liabilities assumed	4,970
Total identifiable net assets	8,960
Goodwill	5,154
Total purchase price	$	14,114

Property, plant and equipment:

Property, plant and equipment consists primarily of pipeline, pipeline-related equipment, storage tanks and processing equipment and will be depreciated on a straight-line basis over the estimated useful lives of the assets.

Intangible assets:

The preliminary value of net identifiable intangible assets relates to contract-based customer relationships that will be amortized over the period of expected benefit.

Long-term debt, excluding current maturities:

We assumed the outstanding debt of Magellan and utilized publicly traded prices to estimate the fair value. The debt comprises senior unsecured obligations with varying maturities and interest rates as outlined in Note F. Recognizing the debt at its acquisition date fair value resulted in a discount from the notional value. The discount will be amortized into interest expense over the remaining life of the debt.

Other deferred credits and liabilities:

Magellan’s pension and postretirement benefit net liabilities of $71 million were assumed in conjunction with the Magellan Acquisition. These defined benefit plans are composed of two pension plans, including one for non-union employees and one for union employees, as well as a postretirement welfare benefit plan for certain employees.

Goodwill:

The following table sets forth the amounts of goodwill by segment for the periods indicated:

	Natural Gas Gathering and Processing		Natural Gas Liquids		Natural Gas Pipelines		Refined Products and Crude		Total
	(Millions of dollars)
Gross goodwill	$	153	$	371	$	157	$	—	$	681
Accumulated impairment losses	(153)		—		—		—		(153)
December 31, 2022	—		371		157		—		528
Acquisitions (a)	—		—		—		5,154		5,154
September 30, 2023	$	—	$	371	$	157	$	5,154	$	5,682

(a) - Goodwill from the Magellan Acquisition primarily represents expected commercial and cost synergies and is expected to be fully deductible for tax purposes. Allocation is preliminary and may be updated as we continue to evaluate the benefits of expected commercial and cost synergies to reporting units.

Results of Operations

The results of operations attributable to the Magellan Acquisition have been included in our Consolidated Financial Statements since the date of the acquisition through September 30, 2023. Revenue and net income attributable to the assets acquired for the period September 25, 2023, through September 30, 2023, were $72 million and $29 million, respectively.

For the nine months ended September 30, 2023, we recognized approximately $154 million of transaction costs associated with the Magellan Acquisition, as outlined in the table below. These non-recurring costs are primarily related to advisory fees, severance and settlement of share-based awards for certain Magellan employees, as well as bridge facility commitment fees. The following table sets forth the impact of acquisition related transaction costs in our Consolidated Statements of Income as of the periods indicated:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2023		2023
	(Millions of dollars)
Transaction costs	$	123	$	133
Interest expense	13		21
Total	$	136	$	154

Pro Forma Financial Information

The following table sets forth the unaudited supplemental pro forma financial information for the three and nine months ended September 30, 2023 and 2022, as if we had completed the Magellan Acquisition on January 1, 2022:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Revenue	$	4,850	$	6,723	$	14,764	$	19,548
Net income	$	572	$	596	$	2,364	$	1,336

The summarized unaudited pro forma information reflects the following adjustments:

•Reflects depreciation and amortization based on the preliminary fair values of property, plant and equipment, and intangible assets;

•Reflects $136 million and $154 million of non-recurring transaction costs incurred for the three and nine months ended September 30, 2023, respectively, that were reclassified and included in pro forma net income for the nine months ended September 30, 2022, as if they had been incurred on January 1, 2022;

•Reflects interest expense related to the underwritten public offering of $5.25 billion senior unsecured notes used to fund the cash consideration and other costs related to the Magellan Acquisition;

•Reflects the amortization of the debt discount to fair value of the Magellan long-term debt assumed;

•Reflects the amortization of excess fair value of the replacement share-based awards;

•Reflects the income tax effect of the pro forma adjustments; and

•Excludes the impact of historical activity between ONEOK and Magellan.

The unaudited pro forma financial information for the nine months ended September 30, 2023, includes a one-time operational gain of $779 million related to insurance proceeds on the Medford incident. The unaudited pro forma financial information is presented for informational purposes only and is not necessarily indicative of our operating results that would have occurred had the transaction been completed at the beginning of the period presented, nor is it necessarily indicative of future results.

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MEDFORD INCIDENT

9 Months Ended

Sep. 30, 2023

Unusual or Infrequent Items, or Both [Abstract]

Medford Incident

MEDFORD INCIDENT

On July 9, 2022, a fire occurred at our 210 MBbl/d Medford, Oklahoma, natural gas liquids fractionation facility. Beginning in August 2022, we developed claims related to the Medford incident and recorded accruals for the expected insurance recoveries. We assessed incurred costs and lost earnings related to business interruption and property damage to our facility, as well as timing of recognition under applicable insurance recovery guidance, and recorded accruals of $151 million in 2022 for insurance recoveries that offset our incurred costs and losses.

On January 9, 2023, we reached an agreement with our insurers to settle all claims for physical damage and business interruption related to the Medford incident. Under the terms of the settlement agreement, we agreed to resolve the claims for total insurance payments of $930 million, $100 million of which was received in 2022. The remaining $830 million was received in the first quarter 2023. The proceeds serve as settlement for property damage, business interruption claims to the date of the settlement and as payment in lieu of future business interruption insurance claims.

In the first quarter 2023, we applied the $830 million received to our outstanding insurance receivable at December 31, 2022, of $51 million, and recorded an operational gain for the remaining $779 million in other operating (income) expense, net, within the Consolidated Statement of Income. We classified proceeds received within the Consolidated Statement of Cash Flows based on our assessment of the nature of the loss (property and business interruption) included in the settlement.

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FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Determining Fair Value - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date. Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety. Our valuation techniques and inputs are consistent with those discussed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.

Magellan Acquisition - Included in our commodity derivative contracts are exchange-traded, exchange cleared and over-the-counter derivative contracts related to Refined Products, certain NGLs and crude oil. The exchange-traded contracts are valued based on quoted prices in active markets and are classified within Level 1 of our fair value hierarchy. The exchange cleared and over-the-counter derivatives are valued based on significant observable pricing inputs including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence and are classified within Level 2 of our fair value hierarchy.

Recurring Fair Value Measurements - The following tables set forth our recurring fair value measurements as of the dates indicated:

	September 30, 2023
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	49	$	67	$	—	$	116	$	(81)	$	35
Total derivative assets	$	49	$	67	$	—	$	116	$	(81)	$	35
Derivative liabilities
Commodity contracts	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)
Total derivative liabilities	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At September 30, 2023, we held no cash and posted cash of $43 million with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2022
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	15	$	152	$	—	$	167	$	(125)	$	42
Interest-rate contracts	—		11		—		11		—		11
Total derivative assets	$	15	$	163	$	—	$	178	$	(125)	$	53
Derivative liabilities
Commodity contracts	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—
Total derivative liabilities	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2022, we held no cash and posted $9 million of cash with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Derivative Assets (Liabilities)	2023		2022		2023		2022
	(Millions of dollars)
Net liabilities at beginning of period	$	—	$	(110)	$	—	$	(114)
Total changes in fair value:
Settlements included in net income (a)	—		39		—		79
New Level 3 derivatives included in other comprehensive income (b)	—		—		—		73
Unrealized change included in other comprehensive income (b)	—		122		—		13
Net assets at end of period	$	—	$	51	$	—	$	51

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

During the year ended December 31, 2022, we transferred out of Level 3 commodity derivatives associated with certain locations for NGL basis swaps, principally due to improved transparency of market prices as a result of the volume and frequency of transactions in these markets. We consider the valuation of these commodity derivatives, which are transacted through a clearing broker and valued with an unadjusted published price from an exchange, as a Level 2 valuation.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings is equal to book value due to the short-term nature of these items. Our cash and cash equivalents are composed of bank and money market accounts and are classified as Level 1. Our short-term borrowings are classified as Level 2 since the estimated fair value of the short-term borrowings can be determined using information available in the commercial paper market. We have investments associated with our supplemental executive retirement plan and nonqualified

deferred compensation plan that are carried at fair value and primarily are composed of mutual funds, municipal bonds and other fixed income securities classified as Level 1 and Level 2.

The estimated fair value of our consolidated long-term debt, including current maturities, was $19.8 billion and $12.7 billion at September 30, 2023, and December 31, 2022, respectively. The book value of our consolidated long-term debt, including current maturities, was $22.0 billion and $13.6 billion at September 30, 2023, and December 31, 2022, respectively. The estimated fair value of the aggregate 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.

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Risk-management Activities - We are sensitive to changes in natural gas, NGLs and crude oil prices, principally as a result of contractual terms under which these commodities are processed, purchased and sold. As a result of the Magellan Acquisition, we are also sensitive to changes in Refined Product prices. We are also subject to the risk of interest-rate fluctuation in the normal course of business. We use physical-forward purchases and sales and financial derivatives to secure a certain price for a portion of our natural gas, NGLs, Refined Products, condensate and crude oil purchases and sales; to reduce our exposure to commodity price and interest-rate fluctuations; and to achieve more predictable cash flows. We follow established policies and procedures to assess risk and approve, monitor and report our risk-management activities. We have not used these instruments for trading purposes.

Commodity price risk - Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs, Refined Products, condensate and crude oil. We may use commodity derivative instruments to reduce the near-term commodity price risk associated with a portion of our forecasted purchases and sales of commodities.

In our Refined Products and Crude segment, we implemented effective hedging strategies for a substantial portion of the segment’s commodity derivative financial instruments that qualify as cash flow hedges for accounting purposes. Changes in the fair value of commodity derivative instruments not designated as a hedge were immaterial for the period September 25, 2023, through September 30, 2023, and are recorded currently in earnings.

Interest-rate risk - We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt, Treasury locks and interest-rate swaps. Treasury locks are agreements to pay the difference between the benchmark Treasury rate and the rate that is designated in the terms of the agreement. In the second quarter 2023, we entered into $1.1 billion of Treasury locks to hedge the variability of interest payments on a portion of our forecasted debt issuances. In the third quarter 2023, we settled all of our $1.1 billion Treasury locks related to our underwritten public offering of $5.25 billion senior unsecured notes associated with the Magellan Acquisition resulting in a gain of $43 million, which is included in accumulated other comprehensive loss and amortized into interest expense over the term of the related debt. All of our Treasury locks were designated as cash flow hedges.

Interest-rate swaps are agreements to exchange interest payments at some future point based on specified notional amounts. In the third quarter 2023, we settled all of our $0.4 billion forward-starting interest-rate swaps related to our underwritten public offerings of $5.25 billion senior unsecured notes associated with the Magellan Acquisition resulting in a gain of $44 million, which is included in accumulated other comprehensive loss and amortized into interest expense over the term of the related debt. All of our interest-rate swaps were designated as cash flow hedges.

Fair Values of Derivative Instruments - The following table sets forth the fair values of our derivative instruments presented on a gross basis as of the dates indicated:

		September 30, 2023				December 31, 2022
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
Derivatives designated as hedging instruments		(Millions of dollars)
Commodity contracts (a)	Other current assets	$	104	$	(79)	$	160	$	(123)
	Other assets	—		—		6		(1)
Interest-rate contracts	Other current assets	—		—		11		—
Total derivatives designated as hedging instruments		104		(79)		177		(124)
Derivatives not designated as hedging instruments
Commodity contracts (a)	Other current assets/liabilities	12		(5)		1		(1)
Total derivatives not designated as hedging instruments		12		(5)		1		(1)
Total derivatives		$	116	$	(84)	$	178	$	(125)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

Notional Quantities for Derivative Instruments - The following table sets forth the notional quantities for derivative instruments held as of the dates indicated:

		September 30, 2023		December 31, 2022
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments:
Cash flow hedges
Fixed price
- Natural gas (Bcf)	Futures	(18.8)		(39.3)
- Refined Products, crude oil and NGLs (MMBbl)	Futures	(13.8)		(8.4)
Basis
- Natural gas (Bcf)	Futures	(19.4)		(39.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	—	$	0.4
Derivatives not designated as hedging instruments:
Fixed price
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(1.9)		0.1
Basis
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(0.1)		—

Cash Flow Hedges - The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Commodity contracts	$	(37)	$	69	$	57	$	(139)
Interest-rate contracts	52		69		54		213
Total unrealized change in fair value of cash flow hedges in other comprehensive income	$	15	$	138	$	111	$	74

The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2023		2022		2023		2022
		(Millions of dollars)
Commodity contracts	Commodity sales revenues	$	31	$	(78)	$	149	$	(546)
	Cost of sales and fuel	(15)		18		(75)		328
Interest-rate contracts	Interest expense	(5)		(10)		(16)		(29)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	11	$	(70)	$	58	$	(247)

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize credit risk. Our policies and related credit risk are consistent with those discussed in our Annual Report.

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DEBT

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Debt

DEBT

The following table sets forth our consolidated debt as of the dates indicated:

	September 30, 2023		December 31, 2022
	(Millions of dollars)
Commercial paper outstanding (a)	$	—	$	—
Senior unsecured obligations:
$425 at 5.0% due September 2023	—		425
$500 at 7.5% due September 2023	—		500
$500 at 2.75% due September 2024	500		500
$250 at 3.2% due March 2025 (b)	250		—
$500 at 4.9% due March 2025	500		500
$400 at 2.2% due September 2025	387		387
$600 at 5.85% due January 2026	600		600
$650 at 5.0% due March 2026 (b)	650		—
$750 at 5.55% due November 2026	750		—
$500 at 4.0% due July 2027	500		500
$800 at 4.55% due July 2028	800		800
$100 at 6.875% due September 2028	100		100
$750 at 5.65% due November 2028	750		—
$700 at 4.35% due March 2029	700		700
$750 at 3.4% due September 2029	714		714
$850 at 3.1% due March 2030	780		780
$500 at 3.25% due June 2030 (b)	500		—
$500 at 5.8% due November 2030	500		—
$600 at 6.35% due January 2031	600		600
$750 at 6.1% due November 2032	750		750
$1,500 at 6.05% due September 2033	1,500		—
$400 at 6.0% due June 2035	400		400
$600 at 6.65% due October 2036	600		600
$250 at 6.4% due May 2037 (b)	250		—
$600 at 6.85% due October 2037	600		600
$650 at 6.125% due February 2041	650		650
$250 at 4.2% due December 2042 (b)	250		—
$400 at 6.2% due September 2043	400		400
$550 at 5.15% due October 2043 (b)	550		—
$250 at 4.2% due March 2045 (b)	250		—
$500 at 4.25% due September 2046 (b)	500		—
$700 at 4.95% due July 2047	689		689
$500 at 4.2% due October 2047 (b)	500		—
$1,000 at 5.2% due July 2048	1,000		1,000
$500 at 4.85% due February 2049 (b)	500		—
$750 at 4.45% due September 2049	653		673
$500 at 4.5% due March 2050	443		443
$800 at 3.95% due March 2050 (b)	800		—
$300 at 7.15% due January 2051	300		300
$1,750 at 6.625% due September 2053	1,750		—
Guardian $120 term loan, rate of 6.54% as of September 30, 2023, due June 2025	120		120
Viking $60 term loan, rate of 6.67% as of September 30, 2023, due March 2026	60		—
Total debt	23,096		13,731
Unamortized debt discounts	(1,029)		(35)
Unamortized debt issuance costs and terminated swaps	(117)		(75)
Current maturities of long-term debt	(500)		(925)
Long-term debt	$	21,450	$	12,696

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

(b) - Debt assumed in the Magellan Acquisition. Amounts are presented at face value with discount to fair value included in unamortized debt discounts.

$2.5 Billion Credit Agreement - Our $2.5 Billion Credit Agreement, which expires in 2027, is a revolving credit facility and contains certain customary conditions for borrowing, as well as customary financial, affirmative and negative covenants. Among other things, these covenants include maintaining a ratio of consolidated net indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects). In addition, adjusted EBITDA as defined in our $2.5 Billion Credit Agreement allows inclusion of the trailing twelve months of consolidated adjusted EBITDA of the acquired business. In the third quarter 2023, we completed the Magellan Acquisition, which allowed us to elect an acquisition adjustment period under our $2.5 Billion Credit Agreement and, as a result, increased our leverage ratio covenant to 5.5 to 1 for the third quarter 2023 and the two following quarters. Thereafter, the covenant will decrease to 5.0 to 1. At September 30, 2023, we had no outstanding borrowings, our ratio of indebtedness to adjusted EBITDA was 3.7 to 1 and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.

Debt Issuances - In August 2023, we completed an underwritten public offering of $5.25 billion senior unsecured notes consisting of $750 million, 5.55% senior notes due 2026; $750 million, 5.65% senior notes due 2028; $500 million, 5.80% senior notes due 2030; $1.5 billion, 6.05% senior notes due 2033; and $1.75 billion, 6.625% senior notes due 2053. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $5.2 billion. The net proceeds were used to fund the cash consideration and other costs related to the Magellan Acquisition.

Debt Repayments - In June 2023, we redeemed our $500 million, 7.5% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

In February 2023, we redeemed our $425 million, 5.0% senior notes due September 2023 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand.

Debt Guarantees - ONEOK, ONEOK Partners, Magellan and the Intermediate Partnership have cross guarantees in place for ONEOK’s, ONEOK Partners’ and Magellan’s indebtedness. The Guardian Term Loan Agreement and Viking Term Loan Agreement are not guaranteed by ONEOK, ONEOK Partners, Magellan or the Intermediate Partnership.

Viking Term Loan Agreement - In March 2023, Viking entered into a $60 million senior unsecured Term Loan Agreement, which is fully drawn. The proceeds were used to repay intercompany debt with ONEOK and for general corporate purposes. The Viking Term Loan Agreement matures in March 2026 and bears interest at Term SOFR plus an applicable margin. As of September 30, 2023, Viking was in compliance with all covenants under the Viking Term Loan Agreement.

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EQUITY

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

EQUITY

EQUITY

Equity Issuances - On September 25, 2023, we completed the previously announced agreement to acquire all the outstanding common units of Magellan in a cash-and-stock transaction. Pursuant to the Merger Agreement, each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition.

Dividends - Holders of our common stock share equally in any dividend declared by our Board of Directors, subject to the rights of the holders of outstanding Series E Preferred Stock. Dividends paid on our common stock in February 2023, May 2023 and August 2023 were $0.955 per share. A common stock dividend of $0.955 per share was declared for shareholders of record at the close of business on November 1, 2023, payable November 14, 2023.

Our Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock, when and if, declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $0.3 million in February 2023, May 2023 and August 2023. Dividends totaling $0.3 million were declared for the Series E Preferred Stock and are payable November 14, 2023.

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ACCUMULATED OTHER COMPREHENSIVE LOSS

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table sets forth the balance in accumulated other comprehensive loss for the period indicated, net of tax:

	Risk- Management Assets/Liabilities		Retirement and Other Postretirement Benefit Plan Obligations (a)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates		Accumulated Other Comprehensive Loss
	(Millions of dollars)
January 1, 2023	$	(58)	$	(55)	$	5	$	(108)
Other comprehensive income before reclassifications	86		—		—		86
Amounts reclassified to net income (b)	(44)		3		(5)		(46)
Other comprehensive income (loss)	42		3		(5)		40
September 30, 2023	$	(16)	$	(52)	$	—	$	(68)

(a) - Includes amounts related to supplemental executive retirement plan.

(b) - See Note E for details of amounts reclassified to net income for risk-management assets/liabilities.

The following table sets forth information about the balance of accumulated other comprehensive loss at September 30, 2023, representing unrealized gains (losses) related to risk-management assets and liabilities, net of tax:

	Risk- Management Assets/Liabilities
	(Millions of dollars)
Commodity derivative instruments expected to be realized within the next 27 months (a)	$	19
Settled interest-rate swaps and Treasury locks to be recognized over the life of the long-term, fixed-rate debt (b)	(35)
Accumulated other comprehensive loss at September 30, 2023	$	(16)

(a) - Based on commodity prices on September 30, 2023, we expect net gains of $19 million, net of tax, will be reclassified into earnings during the next 12 months. The remaining forecasted gains and losses have offsetting positions and are immaterial.

(b) - We expect net losses of $15 million, net of tax, will be reclassified into earnings during the next 12 months.

The remaining balance in accumulated other comprehensive loss relates to our retirement and other postretirement benefit plan obligations, which are expected to be amortized over the average remaining service period of employees participating in these plans.

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Three Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	453	457.3	$	0.99
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	453	458.2	$	0.99

	Three Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	431	447.7	$	0.96
Diluted EPS
Effect of dilutive securities	—		0.5
Net income available for common stock and common stock equivalents	$	431	448.2	$	0.96

	Nine Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,970	451.2	$	4.37
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,970	452.1	$	4.36

	Nine Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,236	447.4	$	2.76
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,236	448.3	$	2.76

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UNCONSOLIDATED AFFILIATES

9 Months Ended

Sep. 30, 2023

Equity Method Investments and Joint Ventures [Abstract]

UNCONSOLIDATED AFFILIATES

UNCONSOLIDATED AFFILIATES

Equity in Net Earnings from Investments - The following table sets forth our equity in net earnings from investments for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Northern Border	$	20	$	17	$	58	$	53
Overland Pass	17		10		39		23
Roadrunner	10		10		32		28
Other (a)	2		2		3		7
Equity in net earnings from investments	$	49	$	39	$	132	$	111

(a) - Includes equity in net earnings for the acquired investments from the Magellan Acquisition from the period September 25, 2023 through September 30, 2023.

We incurred expenses in transactions with unconsolidated affiliates of $33 million and $26 million for the three months ended September 30, 2023 and 2022, respectively, and $88 million and $56 million for the nine months ended September 30, 2023 and 2022, respectively, related primarily to Overland Pass and Northern Border. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

We are the operator of Roadrunner, and as a result of the Magellan Acquisition, we are also the operator of BridgeTex, HoustonLink, MVP, Powder Springs, Saddlehorn, Texas Frontera and the pipeline activities of Seabrook. In each case, we have operating agreements that provide for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments included in operating income in our Consolidated Statements of Income for all periods presented were not material. In the second quarter 2023, we made an equity contribution of $105 million to Roadrunner, which in combination with an equal contribution from our joint venture partner, was used to repay Roadrunner’s outstanding debt.

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Environmental Matters and Pipeline Safety - The operation of pipelines, plants and other facilities for the gathering, processing, fractionation, transportation and storage of natural gas, NGLs, condensate, Refined Products, crude oil and other products is subject to numerous and complex laws and regulations pertaining to health, safety and the environment. As an owner and/or operator of these facilities, we must comply with laws and regulations that relate to air and water quality, hazardous and solid waste management and disposal, cultural resource protection and other environmental and safety matters. The cost of planning, designing, constructing and operating pipelines, plants and other facilities must incorporate compliance with these laws, regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements and the issuance of injunctions or restrictions on operation or construction. Management does not believe that, based on currently known information, a material risk of noncompliance with these laws and regulations exists that will affect adversely our consolidated results of operations, financial condition or cash flows.

Legal Proceedings - We are a party to various legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

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REVENUES

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

REVENUES

Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and end of the period primarily relate to our firm service transportation contracts with tiered rates, which are not material. The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at December 31, 2022 (a)	$	52
Revenue recognized included in beginning balance	(22)
Net additions (b)	141
Balance at September 30, 2023 (c)	$	171

(a) - Contract liabilities of $23 million and $29 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Net additions include increases due to the Magellan Acquisition, which are primarily related to customer prepayments for services.

(c) - Contract liabilities of $128 million and $43 million are included in the other current liabilities and other deferred credits, respectively in our Consolidated Balance Sheet.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at September 30, 2023, and December 31, 2022, relate to customer receivables. Revenue sources are disaggregated in Note M.

Unsatisfied Performance Obligations - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

The following table presents aggregate value allocated to unsatisfied performance obligations as of September 30, 2023, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 21 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
Remainder of 2023	$	291
2024	1,125
2025	873
2026	708
2027 and beyond	2,281
Total	$	5,278

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the value is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

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SEGMENTS

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

SEGMENTS

.    SEGMENTS

Segment Descriptions - Our operations are divided into four reportable business segments as follows:

•    our Natural Gas Gathering and Processing segment gathers, treats and processes natural gas;

•    our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes Purity NGLs;

•    our Natural Gas Pipelines segment transports and stores natural gas; and

•    our Refined Products and Crude segment transports, stores and distributes Refined Products, certain NGLs and crude oil, as well as conducts certain commodity-related activities including liquids blending, fractionation and marketing activities. This new reportable business segment was added in conjunction with the Magellan Acquisition that closed on September 25, 2023. Results of operations for this business segment are included below for the period September 25, 2023, through September 30, 2023.

Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility, the activity of our wholly owned captive insurance company and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements.

Operating Segment Information - The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Three Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	641	$	3,432	$	—	$	—	$	4,073
Residue natural gas sales	279		—		3		—		282
Gathering, processing and exchange service revenue	36		150		—		—		186
Transportation and storage revenue	—		48		143		—		191
Other	9		4		—		72		85
Total revenues (c)	965		3,634		146		72		4,817
Cost of sales and fuel (exclusive of depreciation and operating costs)	(527)		(2,875)		(2)		(22)		(3,426)
Operating costs	(119)		(168)		(51)		(13)		(351)
Equity in net earnings from investments	—		17		29		3		49
Noncash compensation expense and other	3		6		3		—		12
Segment adjusted EBITDA	$	322	$	614	$	125	$	40	$	1,101
Depreciation and amortization	$	(68)	$	(85)	$	(17)	$	(6)	$	(176)
Capital expenditures	$	126	$	189	$	70	$	1	$	386

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $756 million, of which $696 million related to revenues within the segment, cost of sales and fuel of $240 million and operating costs of $93 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $107 million, cost of sales and fuel of $8 million and operating costs of $42 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $620 million. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Three Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	4,073	$	(624)	$	3,449
Residue natural gas sales	282		—		282
Gathering, processing and exchange services revenue	186		—		186
Transportation and storage revenue	191		(3)		188
Other	85		(1)		84
Total revenues (a)	$	4,817	$	(628)	$	4,189
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(3,426)	$	627	$	(2,799)
Operating costs	$	(351)	$	(1)	$	(352)
Depreciation and amortization	$	(176)	$	(1)	$	(177)
Equity in net earnings from investments	$	49	$	—	$	49
Capital expenditures	$	386	$	12	$	398

(a) - Noncustomer revenue for the three months ended September 30, 2023, totaled $18 million related primarily to gains from derivatives on commodity sales contracts.

Three Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	991	$	4,749	$	—	$	5,740
Residue natural gas sales	824		—		3		827
Gathering, processing and exchange services revenue	36		139		—		175
Transportation and storage revenue	—		40		134		174
Other	8		3		—		11
Total revenues (c)	1,859		4,931		137		6,927
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,461)		(4,317)		(4)		(5,782)
Operating costs	(98)		(144)		(44)		(286)
Equity in net earnings from investments	2		11		26		39
Noncash compensation expense and other	2		4		2		8
Segment adjusted EBITDA	$	304	$	485	$	117	$	906
Depreciation and amortization	$	(65)	$	(76)	$	(16)	$	(157)
Capital expenditures	$	104	$	169	$	40	$	313

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $672 million, of which $621 million related to revenues within the segment, cost of sales and fuel of $205 million and operating costs of $84 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $102 million, cost of sales and fuel of $12 million and operating costs of $37 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.0 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Three Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	5,740	$	(1,006)	$	4,734
Residue natural gas sales	827		—		827
Gathering, processing and exchange services revenue	175		—		175
Transportation and storage revenue	174		(2)		172
Other	11		(5)		6
Total revenues (a)	$	6,927	$	(1,013)	$	5,914
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,782)	$	1,009	$	(4,773)
Operating costs	$	(286)	$	—	$	(286)
Depreciation and amortization	$	(157)	$	—	$	(157)
Equity in net earnings from investments	$	39	$	—	$	39
Capital expenditures	$	313	$	14	$	327

(a) - Noncustomer revenue for the three months ended September 30, 2022, totaled $(57) million related primarily to losses from derivatives on commodity sales contracts.

Nine Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	1,835	$	10,103	$	—	$	—	$	11,938
Residue natural gas sales	1,066		—		28		—		1,094
Gathering, processing and exchange services revenue	109		414		—		—		523
Transportation and storage revenue	—		143		434		—		577
Other	22		9		1		72		104
Total revenues (c)	3,032		10,669		463		72		14,236
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,787)		(8,597)		(17)		(22)		(10,423)
Operating costs	(339)		(481)		(145)		(13)		(978)
Equity in net earnings from investments	1		39		89		3		132
Noncash compensation expense	13		20		5		—		38
Other	(1)		775		1		—		775
Segment adjusted EBITDA	$	919	$	2,425	$	396	$	40	$	3,780
Depreciation and amortization	$	(202)	$	(248)	$	(50)	$	(6)	$	(506)
Investments in unconsolidated affiliates	$	26	$	417	$	440	$	911	$	1,794
Total assets	$	6,976	$	14,988	$	2,433	$	19,185	$	43,582
Capital expenditures	$	308	$	495	$	155	$	1	$	959

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.1 billion, of which $1.9 billion related to revenues within the segment, cost of sales and fuel of $627 million and operating costs of $273 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $326 million, cost of sales and fuel of $31 million and operating costs of $121 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.8 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Nine Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	11,938	$	(1,779)	$	10,159
Residue natural gas sales	1,094		—		1,094
Gathering, processing and exchange services revenue	523		—		523
Transportation and storage revenue	577		(7)		570
Other	104		(8)		96
Total revenues (a)	$	14,236	$	(1,794)	$	12,442
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(10,423)	$	1,795	$	(8,628)
Operating costs	$	(978)	$	(3)	$	(981)
Depreciation and amortization	$	(506)	$	(3)	$	(509)
Equity in net earnings from investments	$	132	$	—	$	132
Investments in unconsolidated affiliates	$	1,794	$	1	$	1,795
Total assets	$	43,582	$	357	$	43,939
Capital expenditures	$	959	$	33	$	992

(a) - Noncustomer revenue for the nine months ended September 30, 2023, totaled $160 million related primarily to gains from derivatives on commodity sales contracts.

Nine Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	3,034	$	14,308	$	—	$	17,342
Residue natural gas sales	2,035		—		30		2,065
Gathering, processing and exchange services revenue	104		415		—		519
Transportation and storage revenue	—		127		387		514
Other	18		8		1		27
Total revenues (c)	5,191		14,858		418		20,467
Cost of sales and fuel (exclusive of depreciation and operating costs)	(4,148)		(12,949)		(22)		(17,119)
Operating costs	(289)		(416)		(126)		(831)
Equity in net earnings from investments	5		25		81		111
Noncash compensation expense and other	12		12		6		30
Segment adjusted EBITDA	$	771	$	1,530	$	357	$	2,658
Depreciation and amortization	$	(193)	$	(226)	$	(47)	$	(466)
Investments in unconsolidated affiliates	$	28	$	414	$	362	$	804
Total assets	$	7,079	$	14,987	$	2,205	$	24,271
Capital expenditures	$	321	$	445	$	82	$	848

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.9 billion, of which $1.7 billion related to revenues within the segment, cost of sales and fuel of $503 million and operating costs of $241 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $329 million, cost of sales and fuel of $40 million and operating costs of $108 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $3.1 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Nine Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	17,342	$	(3,096)	$	14,246
Residue natural gas sales	2,065		—		2,065
Gathering, processing and exchange services revenue	519		—		519
Transportation and storage revenue	514		(6)		508
Other	27		(10)		17
Total revenues (a)	$	20,467	$	(3,112)	$	17,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(17,119)	$	3,102	$	(14,017)
Operating costs	$	(831)	$	4	$	(827)
Depreciation and amortization	$	(466)	$	(3)	$	(469)
Equity in net earnings from investments	$	111	$	—	$	111
Investments in unconsolidated affiliates	$	804	$	—	$	804
Total assets	$	24,271	$	168	$	24,439
Capital expenditures	$	848	$	38	$	886

(a) - Noncustomer revenue for the nine months ended September 30, 2022, totaled $(364) million related primarily to losses from derivatives on commodity sales contracts.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Reconciliation of net income to total segment adjusted EBITDA
Net income	$	454	$	432	$	1,971	$	1,237
Add:
Interest expense, net of capitalized interest	215		167		561		510
Depreciation and amortization	177		157		509		469
Income taxes	141		132		616		385
Noncash compensation expense and other	14		14		32		51
Other corporate costs (b)	100		4		91		6
Total segment adjusted EBITDA (a)	$	1,101	$	906	$	3,780	$	2,658

(a) - The nine months ended September 30, 2023 includes $667 million related to the Medford incident, including a settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs.(b) - Includes costs related to the Magellan Acquisition of $123 million, offset partially by interest income of $26 million for the three months ended September 30, 2023, and costs related to the Magellan Acquisition of $133 million, offset partially by interest income of $42 million for the nine months ended September 30, 2023.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2023

Accounting Policies [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 statement of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2022 year-end Consolidated Balance Sheet data was derived from our audited Consolidated Financial Statements but does not include all disclosures required by GAAP. Certain reclassifications have been made in the prior year Consolidated Financial Statements to conform to the current year presentation. These unaudited Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements in our Annual Report.

Goodwill Impairment Review

Goodwill Impairment Review - We assess our goodwill for impairment at least annually as of July 1, unless events or changes in circumstances indicate an impairment may have occurred before that time. At July 1, 2023, we assessed qualitative factors to determine whether it was more likely than not that the fair value of each of our reporting units with goodwill was less than its carrying amount. After assessing qualitative factors (including macroeconomic conditions, industry and market considerations, costs and overall financial performance), we determined that it was more likely than not that the fair value of the Natural Gas Pipelines and Natural Gas Liquids reporting units were not less than their respective carrying value, that no further testing was necessary and that goodwill was not considered impaired.

Recently Issued Accounting Standards Update

Recently Issued Accounting Standards Update - Changes to GAAP are established by the Financial Accounting Standards Board (FASB) in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. ASUs not discussed herein or in our Annual Report were assessed and determined to be either not applicable or clarifications of ASUs previously issued. There have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us.

Fair Value of Financial Instruments

Determining Fair Value - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date. Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety. Our valuation techniques and inputs are consistent with those discussed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.

Magellan Acquisition - Included in our commodity derivative contracts are exchange-traded, exchange cleared and over-the-counter derivative contracts related to Refined Products, certain NGLs and crude oil. The exchange-traded contracts are valued based on quoted prices in active markets and are classified within Level 1 of our fair value hierarchy. The exchange cleared and over-the-counter derivatives are valued based on significant observable pricing inputs including quoted prices for similar assets and liabilities in active markets and inputs from third-party pricing services supported with corroborative evidence and are classified within Level 2 of our fair value hierarchy.

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MAGELLAN ACQUISITION (Tables)

9 Months Ended

Sep. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following tables set forth the acquisition consideration and preliminary purchase price allocation of assets acquired and liabilities assumed:

	At September 25, 2023
	(Millions of dollars and shares/units, except per share/unit data)
Magellan public common units outstanding	202.1
Cash consideration per Magellan unit	$25.00
Cash consideration	$	5,052
Magellan public common units outstanding	202.1
ONEOK exchange ratio per Magellan unit	0.667
Shares of ONEOK common stock issued	134.8
ONEOK common stock closing price on September 25, 2023	$66.54
Fair value of common stock issued	$	8,969
Fair value of Magellan replacement equity awards	93
Equity consideration	$	9,062
Total consideration	$	14,114

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

	At September 25, 2023
Assets acquired:	(Millions of dollars)
Cash and cash equivalents	$	44
Accounts receivables, net	245
Inventories	348
Other current assets	65
Property, plant and equipment	11,562
Investments in unconsolidated affiliates	909
Intangible assets	645
Other assets	112
Total assets acquired	13,930
Liabilities assumed:
Accounts payable	221
Other current liabilities	533
Long-term debt, excluding current maturities	4,013
Other deferred credits and liabilities	203
Total liabilities assumed	4,970
Total identifiable net assets	8,960
Goodwill	5,154
Total purchase price	$	14,114

Goodwill by Segment

The following table sets forth the amounts of goodwill by segment for the periods indicated:

	Natural Gas Gathering and Processing		Natural Gas Liquids		Natural Gas Pipelines		Refined Products and Crude		Total
	(Millions of dollars)
Gross goodwill	$	153	$	371	$	157	$	—	$	681
Accumulated impairment losses	(153)		—		—		—		(153)
December 31, 2022	—		371		157		—		528
Acquisitions (a)	—		—		—		5,154		5,154
September 30, 2023	$	—	$	371	$	157	$	5,154	$	5,682

(a) - Goodwill from the Magellan Acquisition primarily represents expected commercial and cost synergies and is expected to be fully deductible for tax purposes. Allocation is preliminary and may be updated as we continue to evaluate the benefits of expected commercial and cost synergies to reporting units.

Business Combination, Separately Recognized Transactions

The following table sets forth the impact of acquisition related transaction costs in our Consolidated Statements of Income as of the periods indicated:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2023		2023
	(Millions of dollars)
Transaction costs	$	123	$	133
Interest expense	13		21
Total	$	136	$	154

Business Acquisition, Pro Forma Information

The following table sets forth the unaudited supplemental pro forma financial information for the three and nine months ended September 30, 2023 and 2022, as if we had completed the Magellan Acquisition on January 1, 2022:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Revenue	$	4,850	$	6,723	$	14,764	$	19,548
Net income	$	572	$	596	$	2,364	$	1,336

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FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Recurring Fair Value Measurements

The following tables set forth our recurring fair value measurements as of the dates indicated:

	September 30, 2023
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	49	$	67	$	—	$	116	$	(81)	$	35
Total derivative assets	$	49	$	67	$	—	$	116	$	(81)	$	35
Derivative liabilities
Commodity contracts	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)
Total derivative liabilities	$	(16)	$	(68)	$	—	$	(84)	$	81	$	(3)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At September 30, 2023, we held no cash and posted cash of $43 million with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

	December 31, 2022
	Level 1		Level 2		Level 3		Total - Gross		Netting (a)		Total - Net
	(Millions of dollars)
Derivative assets
Commodity contracts	$	15	$	152	$	—	$	167	$	(125)	$	42
Interest-rate contracts	—		11		—		11		—		11
Total derivative assets	$	15	$	163	$	—	$	178	$	(125)	$	53
Derivative liabilities
Commodity contracts	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—
Total derivative liabilities	$	(38)	$	(87)	$	—	$	(125)	$	125	$	—

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2022, we held no cash and posted $9 million of cash with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.

Reconciliation of Level 3 Fair Value Measurements

The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Derivative Assets (Liabilities)	2023		2022		2023		2022
	(Millions of dollars)
Net liabilities at beginning of period	$	—	$	(110)	$	—	$	(114)
Total changes in fair value:
Settlements included in net income (a)	—		39		—		79
New Level 3 derivatives included in other comprehensive income (b)	—		—		—		73
Unrealized change included in other comprehensive income (b)	—		122		—		13
Net assets at end of period	$	—	$	51	$	—	$	51

(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.

(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES (Tables)

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivatives

The following table sets forth the fair values of our derivative instruments presented on a gross basis as of the dates indicated:

		September 30, 2023				December 31, 2022
	Location in our Consolidated Balance Sheets	Assets		(Liabilities)		Assets		(Liabilities)
Derivatives designated as hedging instruments		(Millions of dollars)
Commodity contracts (a)	Other current assets	$	104	$	(79)	$	160	$	(123)
	Other assets	—		—		6		(1)
Interest-rate contracts	Other current assets	—		—		11		—
Total derivatives designated as hedging instruments		104		(79)		177		(124)
Derivatives not designated as hedging instruments
Commodity contracts (a)	Other current assets/liabilities	12		(5)		1		(1)
Total derivatives not designated as hedging instruments		12		(5)		1		(1)
Total derivatives		$	116	$	(84)	$	178	$	(125)

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

Notional Amounts of Derivative Instruments

The following table sets forth the notional quantities for derivative instruments held as of the dates indicated:

		September 30, 2023		December 31, 2022
	Contract Type	Net Purchased/Payor (Sold/Receiver)
Derivatives designated as hedging instruments:
Cash flow hedges
Fixed price
- Natural gas (Bcf)	Futures	(18.8)		(39.3)
- Refined Products, crude oil and NGLs (MMBbl)	Futures	(13.8)		(8.4)
Basis
- Natural gas (Bcf)	Futures	(19.4)		(39.3)
Interest-rate contracts (Billions of dollars)	Swaps	$	—	$	0.4
Derivatives not designated as hedging instruments:
Fixed price
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(1.9)		0.1
Basis
- Natural gas (Bcf)	Futures	—		(0.1)
- Refined Products, crude oil and NGLs (MMBbl)	Futures and swaps	(0.1)		—

Schedule of Cash Flow Hedging Instruments Effect on Comprehensive Income (Loss)

The following table sets forth the unrealized change in fair value of cash flow hedges in other comprehensive income for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Commodity contracts	$	(37)	$	69	$	57	$	(139)
Interest-rate contracts	52		69		54		213
Total unrealized change in fair value of cash flow hedges in other comprehensive income	$	15	$	138	$	111	$	74

Schedule of Cash Flow Hedging Instruments Effect on Income (Loss)

The following table sets forth the effect of cash flow hedges on net income for the periods indicated:

Derivatives in Cash Flow Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Net Income	Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2023		2022		2023		2022
		(Millions of dollars)
Commodity contracts	Commodity sales revenues	$	31	$	(78)	$	149	$	(546)
	Cost of sales and fuel	(15)		18		(75)		328
Interest-rate contracts	Interest expense	(5)		(10)		(16)		(29)
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives		$	11	$	(70)	$	58	$	(247)

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DEBT (Tables)

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Debt

The following table sets forth our consolidated debt as of the dates indicated:

	September 30, 2023		December 31, 2022
	(Millions of dollars)
Commercial paper outstanding (a)	$	—	$	—
Senior unsecured obligations:
$425 at 5.0% due September 2023	—		425
$500 at 7.5% due September 2023	—		500
$500 at 2.75% due September 2024	500		500
$250 at 3.2% due March 2025 (b)	250		—
$500 at 4.9% due March 2025	500		500
$400 at 2.2% due September 2025	387		387
$600 at 5.85% due January 2026	600		600
$650 at 5.0% due March 2026 (b)	650		—
$750 at 5.55% due November 2026	750		—
$500 at 4.0% due July 2027	500		500
$800 at 4.55% due July 2028	800		800
$100 at 6.875% due September 2028	100		100
$750 at 5.65% due November 2028	750		—
$700 at 4.35% due March 2029	700		700
$750 at 3.4% due September 2029	714		714
$850 at 3.1% due March 2030	780		780
$500 at 3.25% due June 2030 (b)	500		—
$500 at 5.8% due November 2030	500		—
$600 at 6.35% due January 2031	600		600
$750 at 6.1% due November 2032	750		750
$1,500 at 6.05% due September 2033	1,500		—
$400 at 6.0% due June 2035	400		400
$600 at 6.65% due October 2036	600		600
$250 at 6.4% due May 2037 (b)	250		—
$600 at 6.85% due October 2037	600		600
$650 at 6.125% due February 2041	650		650
$250 at 4.2% due December 2042 (b)	250		—
$400 at 6.2% due September 2043	400		400
$550 at 5.15% due October 2043 (b)	550		—
$250 at 4.2% due March 2045 (b)	250		—
$500 at 4.25% due September 2046 (b)	500		—
$700 at 4.95% due July 2047	689		689
$500 at 4.2% due October 2047 (b)	500		—
$1,000 at 5.2% due July 2048	1,000		1,000
$500 at 4.85% due February 2049 (b)	500		—
$750 at 4.45% due September 2049	653		673
$500 at 4.5% due March 2050	443		443
$800 at 3.95% due March 2050 (b)	800		—
$300 at 7.15% due January 2051	300		300
$1,750 at 6.625% due September 2053	1,750		—
Guardian $120 term loan, rate of 6.54% as of September 30, 2023, due June 2025	120		120
Viking $60 term loan, rate of 6.67% as of September 30, 2023, due March 2026	60		—
Total debt	23,096		13,731
Unamortized debt discounts	(1,029)		(35)
Unamortized debt issuance costs and terminated swaps	(117)		(75)
Current maturities of long-term debt	(500)		(925)
Long-term debt	$	21,450	$	12,696

(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

(b) - Debt assumed in the Magellan Acquisition. Amounts are presented at face value with discount to fair value included in unamortized debt discounts.

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Loss

The following table sets forth the balance in accumulated other comprehensive loss for the period indicated, net of tax:

	Risk- Management Assets/Liabilities		Retirement and Other Postretirement Benefit Plan Obligations (a)		Risk- Management Assets/Liabilities of Unconsolidated Affiliates		Accumulated Other Comprehensive Loss
	(Millions of dollars)
January 1, 2023	$	(58)	$	(55)	$	5	$	(108)
Other comprehensive income before reclassifications	86		—		—		86
Amounts reclassified to net income (b)	(44)		3		(5)		(46)
Other comprehensive income (loss)	42		3		(5)		40
September 30, 2023	$	(16)	$	(52)	$	—	$	(68)

(a) - Includes amounts related to supplemental executive retirement plan.

(b) - See Note E for details of amounts reclassified to net income for risk-management assets/liabilities.

Schedule of Accumulated Other Comprehensive Loss for Risk-Management Assets/Liabilities

The following table sets forth information about the balance of accumulated other comprehensive loss at September 30, 2023, representing unrealized gains (losses) related to risk-management assets and liabilities, net of tax:

	Risk- Management Assets/Liabilities
	(Millions of dollars)
Commodity derivative instruments expected to be realized within the next 27 months (a)	$	19
Settled interest-rate swaps and Treasury locks to be recognized over the life of the long-term, fixed-rate debt (b)	(35)
Accumulated other comprehensive loss at September 30, 2023	$	(16)

(a) - Based on commodity prices on September 30, 2023, we expect net gains of $19 million, net of tax, will be reclassified into earnings during the next 12 months. The remaining forecasted gains and losses have offsetting positions and are immaterial.

(b) - We expect net losses of $15 million, net of tax, will be reclassified into earnings during the next 12 months.

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Earnings Per Share

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

	Three Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	453	457.3	$	0.99
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	453	458.2	$	0.99

	Three Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	431	447.7	$	0.96
Diluted EPS
Effect of dilutive securities	—		0.5
Net income available for common stock and common stock equivalents	$	431	448.2	$	0.96

	Nine Months Ended September 30, 2023
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,970	451.2	$	4.37
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,970	452.1	$	4.36

	Nine Months Ended September 30, 2022
	Income		Shares	Per Share Amount
	(Millions, except per share amounts)
Basic EPS
Net income available for common stock	$	1,236	447.4	$	2.76
Diluted EPS
Effect of dilutive securities	—		0.9
Net income available for common stock and common stock equivalents	$	1,236	448.3	$	2.76

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UNCONSOLIDATED AFFILIATES (Tables)

9 Months Ended

Sep. 30, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Equity Method Investments

The following table sets forth our equity in net earnings from investments for the periods indicated:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Northern Border	$	20	$	17	$	58	$	53
Overland Pass	17		10		39		23
Roadrunner	10		10		32		28
Other (a)	2		2		3		7
Equity in net earnings from investments	$	49	$	39	$	132	$	111

(a) - Includes equity in net earnings for the acquired investments from the Magellan Acquisition from the period September 25, 2023 through September 30, 2023.

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REVENUES (Tables)

9 Months Ended

Sep. 30, 2023

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities	(Millions of dollars)
Balance at December 31, 2022 (a)	$	52
Revenue recognized included in beginning balance	(22)
Net additions (b)	141
Balance at September 30, 2023 (c)	$	171

(a) - Contract liabilities of $23 million and $29 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Net additions include increases due to the Magellan Acquisition, which are primarily related to customer prepayments for services.

(c) - Contract liabilities of $128 million and $43 million are included in the other current liabilities and other deferred credits, respectively in our Consolidated Balance Sheet.

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

The following table presents aggregate value allocated to unsatisfied performance obligations as of September 30, 2023, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 21 years:

Expected Period of Recognition in Revenue	(Millions of dollars)
Remainder of 2023	$	291
2024	1,125
2025	873
2026	708
2027 and beyond	2,281
Total	$	5,278

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SEGMENTS (Tables)

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segments

The following tables set forth certain selected financial information for our operating segments for the periods indicated:

Three Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	641	$	3,432	$	—	$	—	$	4,073
Residue natural gas sales	279		—		3		—		282
Gathering, processing and exchange service revenue	36		150		—		—		186
Transportation and storage revenue	—		48		143		—		191
Other	9		4		—		72		85
Total revenues (c)	965		3,634		146		72		4,817
Cost of sales and fuel (exclusive of depreciation and operating costs)	(527)		(2,875)		(2)		(22)		(3,426)
Operating costs	(119)		(168)		(51)		(13)		(351)
Equity in net earnings from investments	—		17		29		3		49
Noncash compensation expense and other	3		6		3		—		12
Segment adjusted EBITDA	$	322	$	614	$	125	$	40	$	1,101
Depreciation and amortization	$	(68)	$	(85)	$	(17)	$	(6)	$	(176)
Capital expenditures	$	126	$	189	$	70	$	1	$	386

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $756 million, of which $696 million related to revenues within the segment, cost of sales and fuel of $240 million and operating costs of $93 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $107 million, cost of sales and fuel of $8 million and operating costs of $42 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $620 million. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Three Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	4,073	$	(624)	$	3,449
Residue natural gas sales	282		—		282
Gathering, processing and exchange services revenue	186		—		186
Transportation and storage revenue	191		(3)		188
Other	85		(1)		84
Total revenues (a)	$	4,817	$	(628)	$	4,189
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(3,426)	$	627	$	(2,799)
Operating costs	$	(351)	$	(1)	$	(352)
Depreciation and amortization	$	(176)	$	(1)	$	(177)
Equity in net earnings from investments	$	49	$	—	$	49
Capital expenditures	$	386	$	12	$	398

(a) - Noncustomer revenue for the three months ended September 30, 2023, totaled $18 million related primarily to gains from derivatives on commodity sales contracts.

Three Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	991	$	4,749	$	—	$	5,740
Residue natural gas sales	824		—		3		827
Gathering, processing and exchange services revenue	36		139		—		175
Transportation and storage revenue	—		40		134		174
Other	8		3		—		11
Total revenues (c)	1,859		4,931		137		6,927
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,461)		(4,317)		(4)		(5,782)
Operating costs	(98)		(144)		(44)		(286)
Equity in net earnings from investments	2		11		26		39
Noncash compensation expense and other	2		4		2		8
Segment adjusted EBITDA	$	304	$	485	$	117	$	906
Depreciation and amortization	$	(65)	$	(76)	$	(16)	$	(157)
Capital expenditures	$	104	$	169	$	40	$	313

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $672 million, of which $621 million related to revenues within the segment, cost of sales and fuel of $205 million and operating costs of $84 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $102 million, cost of sales and fuel of $12 million and operating costs of $37 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.0 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Three Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	5,740	$	(1,006)	$	4,734
Residue natural gas sales	827		—		827
Gathering, processing and exchange services revenue	175		—		175
Transportation and storage revenue	174		(2)		172
Other	11		(5)		6
Total revenues (a)	$	6,927	$	(1,013)	$	5,914
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(5,782)	$	1,009	$	(4,773)
Operating costs	$	(286)	$	—	$	(286)
Depreciation and amortization	$	(157)	$	—	$	(157)
Equity in net earnings from investments	$	39	$	—	$	39
Capital expenditures	$	313	$	14	$	327

(a) - Noncustomer revenue for the three months ended September 30, 2022, totaled $(57) million related primarily to losses from derivatives on commodity sales contracts.

Nine Months Ended September 30, 2023	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Refined Products and Crude (d)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	1,835	$	10,103	$	—	$	—	$	11,938
Residue natural gas sales	1,066		—		28		—		1,094
Gathering, processing and exchange services revenue	109		414		—		—		523
Transportation and storage revenue	—		143		434		—		577
Other	22		9		1		72		104
Total revenues (c)	3,032		10,669		463		72		14,236
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,787)		(8,597)		(17)		(22)		(10,423)
Operating costs	(339)		(481)		(145)		(13)		(978)
Equity in net earnings from investments	1		39		89		3		132
Noncash compensation expense	13		20		5		—		38
Other	(1)		775		1		—		775
Segment adjusted EBITDA	$	919	$	2,425	$	396	$	40	$	3,780
Depreciation and amortization	$	(202)	$	(248)	$	(50)	$	(6)	$	(506)
Investments in unconsolidated affiliates	$	26	$	417	$	440	$	911	$	1,794
Total assets	$	6,976	$	14,988	$	2,433	$	19,185	$	43,582
Capital expenditures	$	308	$	495	$	155	$	1	$	959

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $2.1 billion, of which $1.9 billion related to revenues within the segment, cost of sales and fuel of $627 million and operating costs of $273 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $326 million, cost of sales and fuel of $31 million and operating costs of $121 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $1.8 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

(d) - Disaggregation of revenue for our Refined Products and Crude segment is preliminary and will be updated as we continue to evaluate these contracts.

Nine Months Ended September 30, 2023	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	11,938	$	(1,779)	$	10,159
Residue natural gas sales	1,094		—		1,094
Gathering, processing and exchange services revenue	523		—		523
Transportation and storage revenue	577		(7)		570
Other	104		(8)		96
Total revenues (a)	$	14,236	$	(1,794)	$	12,442
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(10,423)	$	1,795	$	(8,628)
Operating costs	$	(978)	$	(3)	$	(981)
Depreciation and amortization	$	(506)	$	(3)	$	(509)
Equity in net earnings from investments	$	132	$	—	$	132
Investments in unconsolidated affiliates	$	1,794	$	1	$	1,795
Total assets	$	43,582	$	357	$	43,939
Capital expenditures	$	959	$	33	$	992

(a) - Noncustomer revenue for the nine months ended September 30, 2023, totaled $160 million related primarily to gains from derivatives on commodity sales contracts.

Nine Months Ended September 30, 2022	Natural Gas Gathering and Processing		Natural Gas Liquids (a)		Natural Gas Pipelines (b)		Total Segments
	(Millions of dollars)
NGL and condensate sales	$	3,034	$	14,308	$	—	$	17,342
Residue natural gas sales	2,035		—		30		2,065
Gathering, processing and exchange services revenue	104		415		—		519
Transportation and storage revenue	—		127		387		514
Other	18		8		1		27
Total revenues (c)	5,191		14,858		418		20,467
Cost of sales and fuel (exclusive of depreciation and operating costs)	(4,148)		(12,949)		(22)		(17,119)
Operating costs	(289)		(416)		(126)		(831)
Equity in net earnings from investments	5		25		81		111
Noncash compensation expense and other	12		12		6		30
Segment adjusted EBITDA	$	771	$	1,530	$	357	$	2,658
Depreciation and amortization	$	(193)	$	(226)	$	(47)	$	(466)
Investments in unconsolidated affiliates	$	28	$	414	$	362	$	804
Total assets	$	7,079	$	14,987	$	2,205	$	24,271
Capital expenditures	$	321	$	445	$	82	$	848

(a) - Our Natural Gas Liquids segment has regulated and nonregulated operations. Our Natural Gas Liquids segment’s regulated operations had revenues of $1.9 billion, of which $1.7 billion related to revenues within the segment, cost of sales and fuel of $503 million and operating costs of $241 million.

(b) - Our Natural Gas Pipelines segment has regulated and nonregulated operations. Our Natural Gas Pipelines segment’s regulated operations had revenues of $329 million, cost of sales and fuel of $40 million and operating costs of $108 million.

(c) - Intersegment revenues are primarily commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly, and for our Natural Gas Gathering and Processing segment totaled $3.1 billion. Intersegment revenues for our Natural Gas Liquids and Natural Gas Pipelines segments were not material.

Nine Months Ended September 30, 2022	Total Segments		Other and Eliminations		Total
	(Millions of dollars)
Reconciliations of total segments to consolidated
NGL and condensate sales	$	17,342	$	(3,096)	$	14,246
Residue natural gas sales	2,065		—		2,065
Gathering, processing and exchange services revenue	519		—		519
Transportation and storage revenue	514		(6)		508
Other	27		(10)		17
Total revenues (a)	$	20,467	$	(3,112)	$	17,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	$	(17,119)	$	3,102	$	(14,017)
Operating costs	$	(831)	$	4	$	(827)
Depreciation and amortization	$	(466)	$	(3)	$	(469)
Equity in net earnings from investments	$	111	$	—	$	111
Investments in unconsolidated affiliates	$	804	$	—	$	804
Total assets	$	24,271	$	168	$	24,439
Capital expenditures	$	848	$	38	$	886

(a) - Noncustomer revenue for the nine months ended September 30, 2022, totaled $(364) million related primarily to losses from derivatives on commodity sales contracts.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2023		2022		2023		2022
	(Millions of dollars)
Reconciliation of net income to total segment adjusted EBITDA
Net income	$	454	$	432	$	1,971	$	1,237
Add:
Interest expense, net of capitalized interest	215		167		561		510
Depreciation and amortization	177		157		509		469
Income taxes	141		132		616		385
Noncash compensation expense and other	14		14		32		51
Other corporate costs (b)	100		4		91		6
Total segment adjusted EBITDA (a)	$	1,101	$	906	$	3,780	$	2,658

(a) - The nine months ended September 30, 2023 includes $667 million related to the Medford incident, including a settlement gain of $779 million, offset partially by $112 million of third-party fractionation costs.(b) - Includes costs related to the Magellan Acquisition of $123 million, offset partially by interest income of $26 million for the three months ended September 30, 2023, and costs related to the Magellan Acquisition of $133 million, offset partially by interest income of $42 million for the nine months ended September 30, 2023.

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MAGELLAN ACQUISITION - Narrative (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 25, 2023 USD ($) terminal mi condensateSplitter unconsolidatedAffiliate pensionPlan $ / shares shares	Aug. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Number of unconsolidated affiliates | unconsolidatedAffiliate		8
Medford settlement gain						$ 779	$ 0
Business Interruption - Settlement Proceeds | Medford Incident
Business Acquisition [Line Items]
Medford settlement gain					$ 779	779
Magellan Acquisition
Business Acquisition [Line Items]
ONEOK exchange ratio per Magellan unit (in shares) | shares		0.667
Cash consideration per Magellan unit (in dollars per share) | $ / shares		$ 25.00
Total consideration		$ 14,114
Shares of ONEOK common stock issued (in shares) | shares		134,800,000
Equity consideration		$ 9,062
Proceeds from issuance of senior debt		5,250
Extinguishment of debt		$ 5,250
Pipeline length (in miles) | mi		9,800
Crude oil pipeline length (in miles) | mi		1,000
Number of pipeline terminals | terminal		54
Number of marine terminals | terminal		1
Condensate splitters | condensateSplitter		1
Storage capacity | terminal		3
Liability, retirement and postemployment benefits		$ 71
Number of pension plans | pensionPlan		2
Business combination, revenue	$ 72
Business combination, net income	$ 29
Non-recurring transaction costs				$ 136		$ 154
Magellan Acquisition | Senior Notes
Business Acquisition [Line Items]
Proceeds from issuance of senior debt			$ 5,200
Debt, face amount		$ 5,250
Magellan Acquisition | Common Stock
Business Acquisition [Line Items]
Equity consideration		$ 8,969

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MAGELLAN ACQUISITION - Acquisition Consideration (Details) - Magellan Acquisition $ / shares in Units, $ in Millions	Sep. 25, 2023 USD ($) $ / shares shares
Business Combination Segment Allocation [Line Items]
Magellan public common units outstanding (in shares) | shares	202,100,000
Cash consideration per Magellan unit (in dollars per share) | $ / shares	$ 25.00
Cash consideration	$ 5,052
ONEOK exchange ratio per Magellan unit (in shares) | shares	0.667
Shares of ONEOK common stock issued (in shares) | shares	134,800,000
ONEOK common stock closing price (in dollars per share) | $ / shares	$ 66.54
Equity consideration	$ 9,062
Total consideration	14,114
Common Stock
Business Combination Segment Allocation [Line Items]
Equity consideration	8,969
Replacement Equity Awards
Business Combination Segment Allocation [Line Items]
Equity consideration	$ 93

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MAGELLAN ACQUISITION - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 25, 2023	Dec. 31, 2022
Liabilities assumed:
Goodwill	$ 5,682		$ 528
Magellan Acquisition
Assets acquired:
Cash and cash equivalents		$ 44
Accounts receivables, net		245
Inventories		348
Other current assets		65
Property, plant and equipment		11,562
Investments in unconsolidated affiliates		909
Intangible assets		645
Other assets		112
Total assets acquired		13,930
Liabilities assumed:
Accounts payable		221
Other current liabilities		533
Long-term debt, excluding current maturities		4,013
Other deferred credits and liabilities		203
Total liabilities assumed		4,970
Total identifiable net assets		8,960
Goodwill		5,154
Total purchase price		$ 14,114

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MAGELLAN ACQUISITION - Goodwill Related To Acquisition (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Goodwill [Line Items]
Gross goodwill		$ 681
Accumulated impairment losses		(153)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 528
Acquisitions	5,154
Goodwill, ending balance	5,682
Natural Gas Gathering and Processing
Goodwill [Line Items]
Gross goodwill		153
Accumulated impairment losses		(153)
Goodwill [Roll Forward]
Goodwill beginning balance	0
Acquisitions	0
Goodwill, ending balance	0
Natural Gas Liquids
Goodwill [Line Items]
Gross goodwill		371
Accumulated impairment losses		0
Goodwill [Roll Forward]
Goodwill beginning balance	371
Acquisitions	0
Goodwill, ending balance	371
Natural Gas Pipelines
Goodwill [Line Items]
Gross goodwill		157
Accumulated impairment losses		0
Goodwill [Roll Forward]
Goodwill beginning balance	157
Acquisitions	0
Goodwill, ending balance	157
Refined Products and Crude
Goodwill [Line Items]
Gross goodwill		0
Accumulated impairment losses		$ 0
Goodwill [Roll Forward]
Goodwill beginning balance	0
Acquisitions	5,154
Goodwill, ending balance	$ 5,154

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MAGELLAN ACQUISITION - Acquisition Related Transaction Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Combination, Separately Recognized Transactions [Line Items]
Transaction costs	$ 123	$ 0	$ 133	$ 0
Interest expense	215	$ 167	561	$ 510
Magellan Acquisition
Business Combination, Separately Recognized Transactions [Line Items]
Transaction costs	123		133
Interest expense	13		21
Total	$ 136		$ 154

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MAGELLAN ACQUISITION - Acquisition, Pro Forma Financial Information (Details) - ONEOK, Inc. | Magellan Midstream Partners L.P. - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue	$ 4,850	$ 6,723	$ 14,764	$ 19,548
Net income	$ 572	$ 596	$ 2,364	$ 1,336

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MEDFORD INCIDENT (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended	15 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Mar. 31, 2023
Business Interruption Loss [Line Items]
Gain on business interruption insurance recovery		$ 779	$ 0
Medford Incident | Total Receivables 2022
Business Interruption Loss [Line Items]
Loss contingency, insurance receivables				$ 151
Medford Incident | Insurance Recoveries
Business Interruption Loss [Line Items]
Unusual item, insurance proceeds					$ 930
Medford Incident | Insurance Recoveries in 2022
Business Interruption Loss [Line Items]
Unusual item, insurance proceeds				100
Medford Incident | Business Interruption - Settlement Proceeds Received in 2023
Business Interruption Loss [Line Items]
Unusual item, insurance proceeds	$ 830
Medford Incident | Business Interruption - Settlement Proceeds
Business Interruption Loss [Line Items]
Outstanding insurance receivable				$ 51
Gain on business interruption insurance recovery	$ 779	$ 779

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FAIR VALUE MEASUREMENTS - Recurring Fair Value Measurements (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Derivative liabilities
Cash held - offsetting derivative net asset positions under master- netting arrangements	$ 0	$ 0
Cash posted - total	43,000,000	9,000,000
Fair Value, Recurring
Derivative assets
Derivative assets netting	(81,000,000)	(125,000,000)
Derivative assets	35,000,000	53,000,000
Derivative liabilities
Derivative liabilities netting	81,000,000	125,000,000
Derivative liabilities	(3,000,000)	0
Fair Value, Recurring | Commodity contracts
Derivative assets
Derivative assets netting	(81,000,000)	(125,000,000)
Derivative assets	35,000,000	42,000,000
Derivative liabilities
Derivative liabilities netting	81,000,000	125,000,000
Derivative liabilities	(3,000,000)	0
Fair Value, Recurring | Interest-rate contracts
Derivative assets
Interest-rate contracts		11,000,000
Fair Value, Recurring | Gross Fair Value Measurement
Derivative assets
Derivative asset, fair value, gross	116,000,000	178,000,000
Derivative liabilities
Derivative liability, fair value, gross	(84,000,000)	(125,000,000)
Fair Value, Recurring | Gross Fair Value Measurement | Commodity contracts
Derivative assets
Derivative asset, fair value, gross	116,000,000	167,000,000
Derivative liabilities
Derivative liability, fair value, gross	(84,000,000)	(125,000,000)
Fair Value, Recurring | Gross Fair Value Measurement | Interest-rate contracts
Derivative assets
Interest-rate contracts		11,000,000
Fair Value, Recurring | Level 1
Derivative assets
Derivative asset, fair value, gross	49,000,000	15,000,000
Derivative liabilities
Derivative liability, fair value, gross	(16,000,000)	(38,000,000)
Fair Value, Recurring | Level 1 | Commodity contracts
Derivative assets
Derivative asset, fair value, gross	49,000,000	15,000,000
Derivative liabilities
Derivative liability, fair value, gross	(16,000,000)	(38,000,000)
Fair Value, Recurring | Level 1 | Interest-rate contracts
Derivative assets
Interest-rate contracts		0
Fair Value, Recurring | Level 2
Derivative assets
Derivative asset, fair value, gross	67,000,000	163,000,000
Derivative liabilities
Derivative liability, fair value, gross	(68,000,000)	(87,000,000)
Fair Value, Recurring | Level 2 | Commodity contracts
Derivative assets
Derivative asset, fair value, gross	67,000,000	152,000,000
Derivative liabilities
Derivative liability, fair value, gross	(68,000,000)	(87,000,000)
Fair Value, Recurring | Level 2 | Interest-rate contracts
Derivative assets
Interest-rate contracts		11,000,000
Fair Value, Recurring | Level 3
Derivative assets
Derivative asset, fair value, gross	0	0
Derivative liabilities
Derivative liability, fair value, gross	0	0
Fair Value, Recurring | Level 3 | Commodity contracts
Derivative assets
Derivative asset, fair value, gross	0	0
Derivative liabilities
Derivative liability, fair value, gross	$ 0	0
Fair Value, Recurring | Level 3 | Interest-rate contracts
Derivative assets
Interest-rate contracts		$ 0

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FAIR VALUE MEASUREMENTS - Reconciliation of Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total changes in fair value:
Net liabilities at beginning of period	$ 0	$ (110)	$ 0	$ (114)
Settlements included in net income	0	39	0	79
New Level 3 derivatives included in other comprehensive income	0	0	0	73
Unrealized change included in other comprehensive income	0	122	0	13
Net liabilities at end of period	$ 0	$ 51	$ 0	$ 51

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Billions	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Long-term debt, fair value	$ 19.8	$ 12.7
Long-term debt	$ 22.0	$ 13.6

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 25, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities	$ 12		$ 107	$ 86	$ 57
Senior Notes | Magellan Acquisition
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, face amount						$ 5,250
Treasury Lock
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities	43
Treasury Lock | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount, new contracts		$ 1,100
Derivative, notional amount settled	1,100
Forward contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other comprehensive income (loss) before reclassification, risk-management assets/liabilities	44
Interest-rate contracts | Forward contracts | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount settled	$ 400

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	$ 116	$ 178
(Liabilities)	(84)	(125)
Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	104	177
(Liabilities)	(79)	(124)
Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	12	1
(Liabilities)	(5)	(1)
Other current assets | Interest-rate contracts | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	0	11
(Liabilities)	0	0
Financial contracts | Other current assets | Commodity contracts | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	104	160
(Liabilities)	(79)	(123)
Financial contracts | Other assets | Commodity contracts | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	0	6
(Liabilities)	0	(1)
Financial contracts | Other current assets/liabilities | Commodity contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Assets	12	1
(Liabilities)	$ (5)	$ (1)

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Notional Quantities For Derivative Instruments (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) MMBbls Bcf	Dec. 31, 2022 USD ($) Bcf MMBbls
Derivatives designated as Hedging Instrument | Future | Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	18.8	39.3
Derivatives designated as Hedging Instrument | Future | Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	19.4	39.3
Derivatives designated as Hedging Instrument | Future | Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	13.8	8.4
Derivatives designated as Hedging Instrument | Interest-rate contracts | Purchased/ Payor
Derivative [Line Items]
Derivative, notional amount | $	$ 0	$ 400
Derivatives not designated as hedging instruments | Future | Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	0	0.1
Derivatives not designated as hedging instruments | Future | Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	0	0.1
Derivatives not designated as hedging instruments | Future and Swaps | Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	1.9
Derivatives not designated as hedging instruments | Future and Swaps | Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls		0.1
Derivatives not designated as hedging instruments | Future and Swaps | Refined Products and Crude | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	0.1	0

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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized change in fair value of cash flow hedges in other comprehensive income	$ 15	$ 138	$ 111	$ 74
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	11	(70)	58	(247)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized change in fair value of cash flow hedges in other comprehensive income	(37)	69	57	(139)
Commodity contracts | Commodity sales revenues
Derivative Instruments, Gain (Loss) [Line Items]
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	31	(78)	149	(546)
Commodity contracts | Cost of sales and fuel
Derivative Instruments, Gain (Loss) [Line Items]
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	(15)	18	(75)	328
Interest-rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized change in fair value of cash flow hedges in other comprehensive income	52	69	54	213
Interest-rate contracts | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Total change in fair value of cash flow hedges reclassified from accumulated other comprehensive loss into net income on derivatives	$ (5)	$ (10)	$ (16)	$ (29)

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DEBT - Schedule of Consolidated Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Feb. 28, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Commercial paper outstanding	$ 0			$ 0
Total debt	23,096			13,731
Unamortized debt discounts	(1,029)			(35)
Unamortized debt issuance costs and terminated swaps	(117)			(75)
Current maturities of long-term debt	(500)			(925)
Long-term debt	21,450			12,696
$425 at 5.0% due September 2023
Debt Instrument [Line Items]
Interest rate (as a percent)			5.00%
Total debt	0			425
$500 at 7.5% due September 2023
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	7.50%	7.50%
Total debt	$ 0			500
$500 at 2.75% due September 2024
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	2.75%
Total debt	$ 500			500
$250 at 3.2% due March 2025
Debt Instrument [Line Items]
Debt, face amount	$ 250
Interest rate (as a percent)	3.20%
Total debt	$ 250			0
$500 at 4.9% due March 2025
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.90%
Total debt	$ 500			500
$400 at 2.2% due September 2025
Debt Instrument [Line Items]
Debt, face amount	$ 400
Interest rate (as a percent)	2.20%
Total debt	$ 387			387
$600 at 5.85% due January 2026
Debt Instrument [Line Items]
Debt, face amount	$ 600
Interest rate (as a percent)	5.85%
Total debt	$ 600			600
$650 at 5.0% due March 2026 (b)
Debt Instrument [Line Items]
Debt, face amount	$ 650
Interest rate (as a percent)	5.00%
Total debt	$ 650			0
$750 at 5.55% due November 2026
Debt Instrument [Line Items]
Total debt	750			0
$500 at 4.0% due July 2027
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.00%
Total debt	$ 500			500
$800 at 4.55% due July 2028
Debt Instrument [Line Items]
Debt, face amount	$ 800
Interest rate (as a percent)	4.55%
Total debt	$ 800			800
$100 at 6.875% due September 2028
Debt Instrument [Line Items]
Debt, face amount	$ 100
Interest rate (as a percent)	6.875%
Total debt	$ 100			100
$750 at 5.65% due November 2028
Debt Instrument [Line Items]
Total debt	750			0
$700 at 4.35% due March 2029
Debt Instrument [Line Items]
Debt, face amount	$ 700
Interest rate (as a percent)	4.35%
Total debt	$ 700			700
$750 at 3.4% due September 2029
Debt Instrument [Line Items]
Debt, face amount	$ 750
Interest rate (as a percent)	3.40%
Total debt	$ 714			714
$850 at 3.1% due March 2030
Debt Instrument [Line Items]
Debt, face amount	$ 850
Interest rate (as a percent)	3.10%
Total debt	$ 780			780
$500 at 3.25% due June 2030
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	3.25%
Total debt	$ 500			0
$500 at 5.8% due November 2030
Debt Instrument [Line Items]
Total debt	500			0
$600 at 6.35% due January 2031
Debt Instrument [Line Items]
Debt, face amount	$ 600
Interest rate (as a percent)	6.35%
Total debt	$ 600			600
$750 at 6.1% due November 2032
Debt Instrument [Line Items]
Debt, face amount	$ 750
Interest rate (as a percent)	6.10%
Total debt	$ 750			750
$1,500 at 6.05% due September 2033
Debt Instrument [Line Items]
Debt, face amount	1,500
Total debt	1,500			0
$400 at 6.0% due June 2035
Debt Instrument [Line Items]
Debt, face amount	$ 400
Interest rate (as a percent)	6.00%
Total debt	$ 400			400
$600 at 6.65% due October 2036
Debt Instrument [Line Items]
Debt, face amount	$ 600
Interest rate (as a percent)	6.65%
Total debt	$ 600			600
$250 at 6.4% due May 2037
Debt Instrument [Line Items]
Debt, face amount	$ 250
Interest rate (as a percent)	6.40%
Total debt	$ 250			0
$600 at 6.85% due October 2037
Debt Instrument [Line Items]
Debt, face amount	$ 600
Interest rate (as a percent)	6.85%
Total debt	$ 600			600
$650 at 6.125% due February 2041
Debt Instrument [Line Items]
Debt, face amount	$ 650
Interest rate (as a percent)	6.125%
Total debt	$ 650			650
$250 at 4.2% due December 2042
Debt Instrument [Line Items]
Debt, face amount	$ 250
Interest rate (as a percent)	4.20%
Total debt	$ 250			0
$400 at 6.2% due September 2043
Debt Instrument [Line Items]
Debt, face amount	$ 400
Interest rate (as a percent)	6.20%
Total debt	$ 400			400
$550 at 5.15% due October 2043
Debt Instrument [Line Items]
Debt, face amount	$ 550
Interest rate (as a percent)	5.15%
Total debt	$ 550			0
$250 at 4.2% due March 2045
Debt Instrument [Line Items]
Debt, face amount	$ 250
Interest rate (as a percent)	4.20%
Total debt	$ 250			0
$500 at 4.25% due September 2046
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.25%
Total debt	$ 500			0
$700 at 4.95% due July 2047
Debt Instrument [Line Items]
Debt, face amount	$ 700
Interest rate (as a percent)	4.95%
Total debt	$ 689			689
$500 at 4.2% due October 2047
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.20%
Total debt	$ 500			0
$1,000 at 5.2% due July 2048
Debt Instrument [Line Items]
Debt, face amount	$ 1,000
Interest rate (as a percent)	5.20%
Total debt	$ 1,000			1,000
$500 at 4.85% due February 2049
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.85%
Total debt	$ 500			0
$750 at 4.45% due September 2049
Debt Instrument [Line Items]
Debt, face amount	$ 750
Interest rate (as a percent)	4.45%
Total debt	$ 653			673
$500 at 4.5% due March 2050
Debt Instrument [Line Items]
Debt, face amount	$ 500
Interest rate (as a percent)	4.50%
Total debt	$ 443			443
$800 at 3.95% due March 2050
Debt Instrument [Line Items]
Debt, face amount	$ 800
Interest rate (as a percent)	3.95%
Total debt	$ 800			0
$300 at 7.15% due January 2051
Debt Instrument [Line Items]
Debt, face amount	$ 300
Interest rate (as a percent)	7.15%
Total debt	$ 300			300
$1,750 at 6.625% due September 2053
Debt Instrument [Line Items]
Total debt	1,750			0
Notes Payable due 2025 | Variable Rate | Guardian Pipeline
Debt Instrument [Line Items]
Debt, face amount	120
Total debt	$ 120			120
Debt Instrument, Interest Rate During Period	6.54%
Notes Payable due 2026 | Variable Rate | Viking Pipeline
Debt Instrument [Line Items]
Debt, face amount	$ 60
Total debt	$ 60			$ 0
Debt Instrument, Interest Rate During Period	6.67%

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DEBT - Narrative (Details) - USD ($) $ in Millions		1 Months Ended
	Sep. 25, 2023	Aug. 31, 2023	Jun. 30, 2023	Feb. 28, 2023	Sep. 30, 2023	Mar. 31, 2023
Magellan Acquisition
Debt Instrument [Line Items]
Proceeds from issuance of senior debt	$ 5,250
Magellan Acquisition | Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of senior debt		$ 5,200
Debt, face amount	$ 5,250
$750 at 5.55% due November 2026 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 750
Interest rate (as a percent)					5.55%
$750 at 5.65% due November 2028 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 750
Interest rate (as a percent)					5.65%
$500 at 5.8% due November 2030 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 500
Interest rate (as a percent)					5.80%
$1,500 at 6.05% due September 2033
Debt Instrument [Line Items]
Debt, face amount					$ 1,500
$1,500 at 6.05% due September 2033 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 1,500
Interest rate (as a percent)					6.05%
$1,750 at 6.625% due September 2053 | Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 1,750
Interest rate (as a percent)					6.625%
$500 at 7.5% due September 2023
Debt Instrument [Line Items]
Debt, face amount					$ 500
Interest rate (as a percent)			7.50%		7.50%
Repayments of debt			$ 500
Redemption price, percentage (as a percent)			100.00%
$425 at 5.0% due September 2023
Debt Instrument [Line Items]
Interest rate (as a percent)				5.00%
Repayments of debt				$ 425
Redemption price, percentage (as a percent)				100.00%
Viking Term Loan Agreement | Unsecured Debt
Debt Instrument [Line Items]
Debt, face amount						$ 60
$2.5 Billion Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 2,500
Indebtedness to adjusted EBITDA, maximum from acquisitions					5.5
Indebtedness to adjusted EBITDA maximum					5
Line of credit facility, amount outstanding					$ 0
Indebtedness to adjusted EBITDA, current					3.7

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EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended			3 Months Ended
	Nov. 14, 2023	Nov. 01, 2023	Sep. 25, 2023	Aug. 31, 2023	May 31, 2023	Feb. 28, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Option Indexed to Issuer's Equity [Line Items]
Common stock dividends paid (in dollars per share)				$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.935	$ 0.935	$ 0.935
Preferred stock dividends							$ 1.0	$ 0.0	$ 0.0	$ 1.0	$ 0.0	$ 0.0
Forecast
Option Indexed to Issuer's Equity [Line Items]
Common stock, dividends, declared (in dollars per share)		$ 0.955
Magellan Acquisition
Option Indexed to Issuer's Equity [Line Items]
ONEOK exchange ratio per Magellan unit (in shares)			0.667
Cash consideration per Magellan unit (in dollars per share)			$ 25.00
Shares of ONEOK common stock issued (in shares)			134,800,000
Equity consideration			$ 9,062.0
Magellan Acquisition | Common Stock
Option Indexed to Issuer's Equity [Line Items]
Equity consideration			$ 8,969.0
Series E Preferred Stock
Option Indexed to Issuer's Equity [Line Items]
Preferred stock, dividend rate, percentage (as a percent)							5.50%
Dividends, preferred stock, cash paid				$ 0.3	$ 0.3	$ 0.3
Series E Preferred Stock | Forecast
Option Indexed to Issuer's Equity [Line Items]
Preferred stock dividends	$ 0.3

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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Before and After Reclassification (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total equity, beginning balance	$ 6,494
Other comprehensive income before reclassifications	86
Amounts reclassified to net income	(46)
Other comprehensive income (loss)	40
Total equity, ending balance	16,299
Risk- Management Assets/Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total equity, beginning balance	(58)
Other comprehensive income before reclassifications	86
Amounts reclassified to net income	(44)
Other comprehensive income (loss)	42
Total equity, ending balance	(16)
Retirement and Other Postretirement Benefit Plan Obligations (a)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total equity, beginning balance	(55)
Other comprehensive income before reclassifications	0
Amounts reclassified to net income	3
Other comprehensive income (loss)	3
Total equity, ending balance	(52)
Risk- Management Assets/Liabilities of Unconsolidated Affiliates
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total equity, beginning balance	5
Other comprehensive income before reclassifications	0
Amounts reclassified to net income	(5)
Other comprehensive income (loss)	(5)
Total equity, ending balance	0
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total equity, beginning balance	(108)
Total equity, ending balance	$ (68)

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ACCUMULATED OTHER COMPREHENSIVE LOSS - AOCI Representing Unrealized Gains (Loss) Related to Risk Management (Details) - Cash Flow Hedging $ in Millions	Sep. 30, 2023 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of accumulated other comprehensive income attributable primarily to forward starting interest-rate swaps	$ (16)
Commodity contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income	19
Price risk cash flow hedge unrealized gain (loss) to be reclassified during next 12 months	19
Interest-rate contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of accumulated other comprehensive income (loss) attributable primarily to settled interest-rate swaps	(35)
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ (15)

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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic EPS
Net income available for common stock	$ 453	$ 431	$ 1,970	$ 1,236
Basic average shares (in shares)	457.3	447.7	451.2	447.4
Earnings per share, basic (in dollars per share)	$ 0.99	$ 0.96	$ 4.37	$ 2.76
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities, shares (in shares)	0.9	0.5	0.9	0.9
Net income available to common stock holders, diluted	$ 453	$ 431	$ 1,970	$ 1,236
Diluted average shares (in shares)	458.2	448.2	452.1	448.3
Earnings per share, diluted (in dollars per share)	$ 0.99	$ 0.96	$ 4.36	$ 2.76

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UNCONSOLIDATED AFFILIATES - Equity in Net Earnings from Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 49	$ 39	$ 132	$ 111
Northern Border
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	20	17	58	53
Overland Pass
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	17	10	39	23
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	10	10	32	28
Other
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 2	$ 2	$ 3	$ 7

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UNCONSOLIDATED AFFILIATES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments in and Advances to Affiliates [Line Items]
Contributions to unconsolidated affiliates				$ 111	$ 2
Roadrunner
Investments in and Advances to Affiliates [Line Items]
Contributions to unconsolidated affiliates		$ 105
Unconsolidated Affiliates
Investments in and Advances to Affiliates [Line Items]
Unconsolidated entities expenses in transactions	$ 33		$ 26	$ 88	$ 56

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REVENUES - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Contract with Customer Liability [Roll Forward]
Contract with customer, liability, beginning balance	$ 171	$ 52
Revenue recognized included in beginning balance	(22)
Net additions	141
Contract with customer, liability, ending balance	171
Contract with customer, liability, current	128	23
Contract with customer, liability, noncurrent	$ 43	$ 29

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REVENUES - Performance Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5,278
Remaining Contract Terms
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, contract term	one month to 21 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 291
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 1,125
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 873
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 708
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 2,281

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SEGMENTS - Operating Segments Financial Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Total revenues (Note L)	$ 4,189	$ 5,914	$ 12,442	$ 17,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,799)	(4,773)	(8,628)	(14,017)
Operating costs	(352)	(286)	(981)	(827)
Equity in net earnings from investments	49	39	132	111
Other operating income (expense), net	1	2	782	9
Segment adjusted EBITDA	1,101	906	3,780	2,658
Depreciation and amortization	(177)	(157)	(509)	(469)
Investments in unconsolidated affiliates	1,795	804	1,795	804	$ 802
Total assets	43,939	24,439	43,939	24,439	$ 24,379
Capital expenditures	398	327	992	886
Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	4,817	6,927	14,236	20,467
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,426)	(5,782)	(10,423)	(17,119)
Operating costs	(351)	(286)	(978)	(831)
Equity in net earnings from investments	49	39	132	111
Noncash compensation expense and other	12	8	38	30
Other operating income (expense), net			775
Segment adjusted EBITDA	1,101	906	3,780	2,658
Depreciation and amortization	(176)	(157)	(506)	(466)
Investments in unconsolidated affiliates	1,794	804	1,794	804
Total assets	43,582	24,271	43,582	24,271
Capital expenditures	386	313	959	848
Natural Gas Gathering and Processing | Natural Gas Gathering and Processing Intersegment
Segment Reporting Information [Line Items]
Total revenues (Note L)	620	1,000	1,800	3,100
Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	965	1,859	3,032	5,191
Cost of sales and fuel (exclusive of depreciation and operating costs)	(527)	(1,461)	(1,787)	(4,148)
Operating costs	(119)	(98)	(339)	(289)
Equity in net earnings from investments	0	2	1	5
Noncash compensation expense and other	3	2	13	12
Other operating income (expense), net			(1)
Segment adjusted EBITDA	322	304	919	771
Depreciation and amortization	(68)	(65)	(202)	(193)
Investments in unconsolidated affiliates	26	28	26	28
Total assets	6,976	7,079	6,976	7,079
Capital expenditures	126	104	308	321
Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	3,634	4,931	10,669	14,858
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,875)	(4,317)	(8,597)	(12,949)
Operating costs	(168)	(144)	(481)	(416)
Equity in net earnings from investments	17	11	39	25
Noncash compensation expense and other	6	4	20	12
Other operating income (expense), net			775
Segment adjusted EBITDA	614	485	2,425	1,530
Depreciation and amortization	(85)	(76)	(248)	(226)
Investments in unconsolidated affiliates	417	414	417	414
Total assets	14,988	14,987	14,988	14,987
Capital expenditures	189	169	495	445
Natural Gas Liquids | Natural gas liquids regulated
Segment Reporting Information [Line Items]
Total revenues (Note L)	756	672	2,100	1,900
Cost of sales and fuel (exclusive of depreciation and operating costs)	(240)	(205)	(627)	(503)
Operating costs	(93)	(84)	(273)	(241)
Natural Gas Liquids | Natural gas liquids regulated | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	696	621	1,900	1,700
Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	146	137	463	418
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2)	(4)	(17)	(22)
Operating costs	(51)	(44)	(145)	(126)
Equity in net earnings from investments	29	26	89	81
Noncash compensation expense and other	3	2	5	6
Other operating income (expense), net			1
Segment adjusted EBITDA	125	117	396	357
Depreciation and amortization	(17)	(16)	(50)	(47)
Investments in unconsolidated affiliates	440	362	440	362
Total assets	2,433	2,205	2,433	2,205
Capital expenditures	70	40	155	82
Natural Gas Pipelines | Natural gas pipelines regulated
Segment Reporting Information [Line Items]
Total revenues (Note L)	107	102	326	329
Cost of sales and fuel (exclusive of depreciation and operating costs)	(8)	(12)	(31)	(40)
Operating costs	(42)	(37)	(121)	(108)
Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	72		72
Cost of sales and fuel (exclusive of depreciation and operating costs)	(22)		(22)
Operating costs	(13)		(13)
Equity in net earnings from investments	3		3
Noncash compensation expense and other	0		0
Other operating income (expense), net			0
Segment adjusted EBITDA	40		40
Depreciation and amortization	(6)		(6)
Investments in unconsolidated affiliates	911		911
Total assets	19,185		19,185
Capital expenditures	1		1
NGL and condensate sales
Segment Reporting Information [Line Items]
Total revenues (Note L)	3,449	4,734	10,159	14,246
NGL and condensate sales | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	4,073	5,740	11,938	17,342
NGL and condensate sales | Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	641	991	1,835	3,034
NGL and condensate sales | Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	3,432	4,749	10,103	14,308
NGL and condensate sales | Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
NGL and condensate sales | Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0		0
Residue natural gas sales
Segment Reporting Information [Line Items]
Total revenues (Note L)	282	827	1,094	2,065
Residue natural gas sales | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	282	827	1,094	2,065
Residue natural gas sales | Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	279	824	1,066	2,035
Residue natural gas sales | Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
Residue natural gas sales | Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	3	3	28	30
Residue natural gas sales | Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0		0
Gathering, processing and exchange service revenue
Segment Reporting Information [Line Items]
Total revenues (Note L)	186	175	523	519
Gathering, processing and exchange service revenue | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	186	175	523	519
Gathering, processing and exchange service revenue | Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	36	36	109	104
Gathering, processing and exchange service revenue | Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	150	139	414	415
Gathering, processing and exchange service revenue | Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
Gathering, processing and exchange service revenue | Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0		0
Transportation and storage revenue
Segment Reporting Information [Line Items]
Total revenues (Note L)	188	172	570	508
Transportation and storage revenue | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	191	174	577	514
Transportation and storage revenue | Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
Transportation and storage revenue | Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	48	40	143	127
Transportation and storage revenue | Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	143	134	434	387
Transportation and storage revenue | Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0		0
Other
Segment Reporting Information [Line Items]
Total revenues (Note L)	84	6	96	17
Other | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	85	11	104	27
Other | Natural Gas Gathering and Processing | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	9	8	22	18
Other | Natural Gas Liquids | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	4	3	9	8
Other | Natural Gas Pipelines | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	$ 0	1	$ 1
Other | Refined Products and Crude | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	$ 72		$ 72

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SEGMENTS - Reconciliations for Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues (Note L)	$ 4,189	$ 5,914	$ 12,442	$ 17,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,799)	(4,773)	(8,628)	(14,017)
Operating costs	(352)	(286)	(981)	(827)
Depreciation and amortization	(177)	(157)	(509)	(469)
Equity in net earnings from investments	49	39	132	111
Investments in unconsolidated affiliates	1,795	804	1,795	804	$ 802
Total assets	43,939	24,439	43,939	24,439	$ 24,379
Capital expenditures	398	327	992	886
Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	4,817	6,927	14,236	20,467
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,426)	(5,782)	(10,423)	(17,119)
Operating costs	(351)	(286)	(978)	(831)
Depreciation and amortization	(176)	(157)	(506)	(466)
Equity in net earnings from investments	49	39	132	111
Investments in unconsolidated affiliates	1,794	804	1,794	804
Total assets	43,582	24,271	43,582	24,271
Capital expenditures	386	313	959	848
Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	(628)	(1,013)	(1,794)	(3,112)
Cost of sales and fuel (exclusive of depreciation and operating costs)	627	1,009	1,795	3,102
Operating costs	(1)	0	(3)	4
Depreciation and amortization	(1)	0	(3)	(3)
Equity in net earnings from investments	0	0	0	0
Investments in unconsolidated affiliates	1	0	1	0
Total assets	357	168	357	168
Capital expenditures	12	14	33	38
Noncustomer [Member]
Segment Reporting Information [Line Items]
Total revenues (Note L)	18	(57)	160	(364)
NGL and condensate sales
Segment Reporting Information [Line Items]
Total revenues (Note L)	3,449	4,734	10,159	14,246
NGL and condensate sales | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	4,073	5,740	11,938	17,342
NGL and condensate sales | Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	(624)	(1,006)	(1,779)	(3,096)
Residue natural gas sales
Segment Reporting Information [Line Items]
Total revenues (Note L)	282	827	1,094	2,065
Residue natural gas sales | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	282	827	1,094	2,065
Residue natural gas sales | Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
Gathering, processing and exchange service revenue
Segment Reporting Information [Line Items]
Total revenues (Note L)	186	175	523	519
Gathering, processing and exchange service revenue | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	186	175	523	519
Gathering, processing and exchange service revenue | Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	0	0	0	0
Transportation and storage revenue
Segment Reporting Information [Line Items]
Total revenues (Note L)	188	172	570	508
Transportation and storage revenue | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	191	174	577	514
Transportation and storage revenue | Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	(3)	(2)	(7)	(6)
Other
Segment Reporting Information [Line Items]
Total revenues (Note L)	84	6	96	17
Other | Operating segments
Segment Reporting Information [Line Items]
Total revenues (Note L)	85	11	104	27
Other | Other and eliminations
Segment Reporting Information [Line Items]
Total revenues (Note L)	$ (1)	$ (5)	$ (8)	$ (10)

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SEGMENTS - Reconciliation of Net Income to Total Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net income	$ 454	$ 468	$ 1,049	$ 432	$ 414	$ 391	$ 1,971	$ 1,237
Interest expense	215			167			561	510
Depreciation and amortization	177			157			509	469
Income tax expense	141			132			616	385
Noncash compensation expense and other	14			14			32	51
Other corporate costs	100			4			91	6
Segment adjusted EBITDA	1,101			906			3,780	2,658
Medford settlement gain							779	0
Transaction costs	123			$ 0			133	$ 0
Interest income	26						42
Medford Incident
Segment Reporting Information [Line Items]
Third party fractionation costs							112
Business Interruption - Settlement Proceeds Less Third Party Frac Costs | Medford Incident
Segment Reporting Information [Line Items]
Medford settlement gain							667
Business Interruption - Settlement Proceeds | Medford Incident
Segment Reporting Information [Line Items]
Medford settlement gain			$ 779				779
Magellan Acquisition
Segment Reporting Information [Line Items]
Interest expense	13						21
Transaction costs	$ 123						$ 133