10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2022

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 1-7584

Transcontinental Gas Pipe Line Company, LLC

(Exact name of registrant as specified in its charter)

Delaware	74-1079400
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2800 Post Oak Boulevard
Houston, Texas	77056
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (713) 215-2000

NO CHANGE

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act: None

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  þ    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  þ   No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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 þ 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  þ

THE REGISTRANT MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTIONS H (1)(a) AND (b) OF FORM 10-Q AND IS THEREFORE FILING THIS FORM 10-Q WITH THE REDUCED DISCLOSURE FORMAT.

Transcontinental Gas Pipe Line Company, LLC

Index

	Page
Part I. Financial Information
Item 1. Financial Statements
Condensed Statement of Net Income –Three Months Ended March 31, 2022 and 2021	4
Condensed Balance Sheet – March 31, 2022 and December 31, 2021	5
Condensed Statement of Changes in Member’s Equity – Three Months Ended March 31, 2022 and 2021	7
Condensed Statement of Cash Flows – Three Months Ended March 31, 2022 and 2021
Notes to Condensed Financial Statements	9
Note 1 – Basis of Presentation	9
Note 2 – Revenue Recognition	9
Note 3 – Contingent Liabilities and Commitments	10
Note 4 – Debt and Financing Arrangements	11
Note 5 – ARO Trust	12
Note 6 – Fair Value Measurements	13
Note 7 – Transactions with Affiliates	13
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
Item 4. Controls and Procedures	17
Part II. Other Information	17
Item 1. Legal Proceedings	17
Item 1A. Risk Factors	17
Item 6. Exhibits	20

Forward Looking Statements

The reports, filings, and other public announcements of Transcontinental Gas Pipe Line Company, LLC may contain or incorporate by reference statements that do not directly or exclusively relate to historical facts. Such statements are “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (Exchange Act). These forward-looking statements relate to anticipated financial performance, management’s plans and objectives for future operations, business prospects, outcome of regulatory proceedings, market conditions, and other matters.

All statements, other than statements of historical facts, included in this report that address activities, events, or developments that we expect, believe, or anticipate will exist or may occur in the future are forward-looking statements. Forward-looking statements can be identified by various forms of words such as “anticipates,” “believes,” “seeks,” “could,” “may,” “should,” “continues,” “estimates,” “expects,” “forecasts,” “intends,” “might,” “goals,” “objectives,” “targets,” “planned,” “potential,” “projects,” “scheduled,” “will,” “assumes,” “guidance,” “outlook,” “in-service date,” or other similar expressions. These forward-looking statements are based on management’s beliefs and assumptions and on information currently available to management and include, among others, statements regarding:

•Our and our affiliates’ future credit ratings;

•Amounts and nature of future capital expenditures;

•Expansion and growth of our business and operations;

1

•Expected in-service dates for capital projects;

•Financial condition and liquidity;

•Business strategy;

•Cash flow from operations or results of operations;

•Rate case filings;

•Natural gas prices, supply, and demand;

•Demand for our services; and

•The impact of the coronavirus (COVID-19) pandemic.

Forward-looking statements are based on numerous assumptions, uncertainties, and risks that could cause future events or results to be materially different from those stated or implied in this report. Many of the factors that will determine these results are beyond our ability to control or predict. Specific factors that could cause actual results to differ from results contemplated by the forward-looking statements include, among others, the following:

•The impact of operational and developmental hazards and unforeseen interruptions;

•Development and rate of adoption of alternative energy sources;

•The strength and financial resources of our competitors and the effects of competition;

•Availability of supplies, including lower than anticipated volumes from third parties, and market demand;

•Volatility of pricing including the effect of lower than anticipated energy commodity prices;

•Changes in maintenance and construction costs, as well as our ability to obtain sufficient construction- related inputs, including skilled labor;

•The impact of existing and future laws and regulations, the regulatory environment, environmental matters, and litigation, as well as our ability to obtain necessary permits and approvals, and achieve favorable rate proceeding outcomes;

•Increasing scrutiny and changing expectations from stakeholders with respect to our environmental, social, and governance practices;

•The physical and financial risks associated with climate change;

•Our exposure to the credit risk of our customers and counterparties;

•Our ability to successfully expand our facilities and operations;

•Whether we are able to successfully identify, evaluate, and timely execute our capital projects and investment opportunities;

•Risks related to financing, including restrictions stemming from debt agreements, future changes in credit ratings as determined by nationally recognized credit rating agencies, and the availability and cost of capital;

2

•Inflation, interest rates, and general economic conditions (including future disruptions and volatility in the global credit markets and the impact of these events on customers and suppliers);

•Our costs for defined benefit pension plans and other postretirement benefit plans sponsored by our affiliates;

•The risks resulting from outbreaks or other public health crises, including COVID-19;

•Changes in the current geopolitical situation, including the Russian invasion of Ukraine;

•Changes in U.S. governmental administration and policies;

•Risks associated with weather and natural phenomena, including climate conditions and physical damage to our facilities;

•Acts of terrorism, cybersecurity incidents, and related disruptions; and

•Additional risks described in our filings with the Securities and Exchange Commission (SEC).

Given the uncertainties and risk factors that could cause our actual results to differ materially from those contained in any forward-looking statement, we caution investors not to unduly rely on our forward-looking statements. We disclaim any obligations to and do not intend to update the above list or announce publicly the result of any revisions to any of the forward-looking statements to reflect future events or developments.

In addition to causing our actual results to differ, the factors listed above and referred to below may cause our intentions to change from those statements of intention set forth in this report. Such changes in our intentions may also cause our results to differ. We may change our intentions, at any time and without notice, based upon changes in such factors, our assumptions, or otherwise.

Because forward-looking statements involve risks and uncertainties, we caution that there are important factors, in addition to those listed above, that may cause actual results to differ materially from those contained in the forward-looking statements. For a detailed discussion of those factors, see Part I, Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2021, as supplemented by the disclosure in Part II, Item 1A. Risk Factors in this Quarterly Report on Form 10-Q.

3

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

Transcontinental Gas Pipe Line Company, LLC

Condensed Statement of Net Income

(Unaudited)

	Three Months Ended March 31,
	2022		2021
	(Thousands)
Operating Revenues:
Natural gas sales	$	15,645	$	14,224
Natural gas transportation	621,537		582,557
Natural gas storage	44,158		42,502
Other	5,128		4,494
Total operating revenues	686,468		643,777
Operating Costs and Expenses:
Cost of natural gas sales	15,645		14,224
Operation and maintenance	111,296		96,084
Administrative and general	51,549		50,753
Depreciation and amortization	132,562		117,797
Taxes — other than income taxes	27,114		24,528
Regulatory credit resulting from tax rate changes	(7,688)		(7,688)
Other (income) expense, net	(10,888)		1,423
Total operating costs and expenses	319,590		297,121
Operating Income	366,878		346,656
Other (Income) and Other Expenses:
Interest expense	82,437		80,175
Allowance for equity and borrowed funds used during construction (AFUDC)	(4,857)		(3,997)
Miscellaneous other expense, net	897		52
Total other (income) and other expenses	78,477		76,230
Net Income	$	288,401	$	270,426

See accompanying notes.

4

Transcontinental Gas Pipe Line Company, LLC

Condensed Balance Sheet

(Unaudited)

	March 31, 2022		December 31, 2021
	(Thousands)
ASSETS
Current Assets:
Cash	$	—	$	—
Receivables:
Affiliates	5,575		6,978
Advances to affiliate	1,941,659		1,669,368
Trade	216,736		234,680
Other (less allowance of $6,229 and $6,222 in 2022 and 2021, respectively)	10,685		12,977
Transportation and exchange gas receivables	3,623		7,685
Inventories	58,147		54,437
Regulatory assets	132,401		114,351
Other	14,179		17,058
Total current assets	2,383,005		2,117,534
Property, Plant and Equipment:
Natural gas transmission plant	17,750,482		17,713,050
Less-Accumulated depreciation and amortization	5,293,340		5,227,128
Total property, plant and equipment, net	12,457,142		12,485,922
Other Assets:
Regulatory assets	275,356		253,081
Right-of-use assets	65,985		68,817
Other	280,336		292,957
Total other assets	621,677		614,855
Total assets	$	15,461,824	$	15,218,311

(continued)

See accompanying notes.

5

Transcontinental Gas Pipe Line Company, LLC

Condensed Balance Sheet

(Unaudited)

	March 31, 2022		December 31, 2021
	(Thousands)
LIABILITIES AND MEMBER’S EQUITY
Current Liabilities:
Payables:
Affiliates	$	57,882	$	69,128
Trade and other	113,094		184,405
Transportation and exchange gas payables	6,112		10,125
Regulatory liabilities	57,781		57,369
Accrued liabilities	184,153		223,013
Long-term debt due within one year	26,182		25,594
Total current liabilities	445,204		569,634
Long-Term Debt	5,265,835		5,269,024
Other Long-Term Liabilities:
Asset retirement obligations	470,884		459,969
Regulatory liabilities	937,771		932,101
Contract liabilities	191,826		194,464
Lease liability	66,985		68,582
Other	4,210		4,281
Total other long-term liabilities	1,671,676		1,659,397
Contingent Liabilities and Commitments (Note 3)
Member’s Equity:
Member’s capital	5,088,499		4,960,499
Retained earnings	2,990,610		2,759,757
Total member’s equity	8,079,109		7,720,256
Total liabilities and member’s equity	$	15,461,824	$	15,218,311

See accompanying notes.

6

Transcontinental Gas Pipe Line Company, LLC

Condensed Statement of Changes in Member’s Equity

(Unaudited)

	Three Months Ended March 31,
	2022		2021
	(Thousands)
Member’s Capital:
Balance at beginning of period	$	4,960,499	$	4,543,499
Cash contributions from parent	128,000		60,000
Balance at end of period	5,088,499		4,603,499
Retained Earnings:
Balance at beginning of period	2,759,757		2,037,320
Net income	288,401		270,426
Cash distributions to parent	(57,548)		—
Balance at end of period	2,990,610		2,307,746
Total Member’s Equity	$	8,079,109	$	6,911,245

See accompanying notes.

7

Transcontinental Gas Pipe Line Company, LLC

Condensed Statement of Cash Flows

(Unaudited)

	Three Months Ended March 31,
	2022		2021
	(Thousands)
OPERATING ACTIVITIES:
Net income	$	288,401	$	270,426
Adjustments to reconcile net cash provided (used) by operating activities:
Depreciation and amortization	132,562		117,797
Allowance for equity funds used during construction (equity AFUDC)	(3,834)		(3,052)
Regulatory credit resulting from tax rate changes	(7,688)		(7,688)
Changes in operating assets and liabilities:
Receivables — affiliates	1,403		(277)
— trade and other	20,229		10,046
Transportation and exchange gas receivable	4,062		(3,051)
Inventories	(3,710)		(4,313)
Payables — affiliates	(11,246)		12,511
— trade	(44,264)		(26,077)
Accrued liabilities	(38,489)		(22,381)
Asset retirement obligations	3,380		4,653
Contract liabilities	(2,638)		(2,638)
Other, net	(21,507)		2,748
Net cash provided by operating activities	316,661		348,704
FINANCING ACTIVITIES:
Proceeds from other financing obligations	2,843		817
Payments on other financing obligations	(6,136)		(5,430)
Payments for debt issuance costs	(16)		(32)
Cash distributions to parent	(57,548)		—
Cash contributions from parent	128,000		60,000
Net cash provided by financing activities	67,143		55,355
INVESTING ACTIVITIES:
Capital expenditures (1)	(97,124)		(89,200)
Contributions and advances for construction costs, net	(4,655)		12,454
Disposal of property, plant and equipment, net	(5,940)		(1,635)
Advances to affiliate, net	(272,291)		(326,104)
Purchase of ARO Trust investments	(4,875)		(14,573)
Proceeds from sale of ARO Trust investments	1,081		14,999
Net cash used by investing activities	(383,804)		(404,059)
Increase (decrease) in cash	—		—
Cash at beginning of period	—		—
Cash at end of period	$	—	$	—
_______________________
(1)       Increase to property, plant and equipment, exclusive of equity AFUDC	$	(65,262)	$	(84,631)
Changes in related accounts payable and accrued liabilities	(31,862)		(4,569)
Capital expenditures	$	(97,124)	$	(89,200)

See accompanying notes.

8

Transcontinental Gas Pipe Line Company, LLC

Notes to Condensed Financial Statements

(Unaudited)

Note 1 – Basis of Presentation

In this report, Transcontinental Gas Pipe Line Company, LLC (Transco) is at times referred to in the first person as “we,” “us” or “our.”

Transco is indirectly owned by The Williams Companies, Inc. (Williams), a publicly traded Delaware corporation. We own and operate an interstate natural gas pipeline system that is regulated by the Federal Energy Regulatory Commission (FERC).

General

The accompanying condensed unaudited financial statements have been prepared from our books and records. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (GAAP) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. The condensed unaudited financial statements include all normal recurring adjustments and others which, in the opinion of our management, are necessary to present fairly our interim financial statements. These condensed unaudited financial statements should be read in conjunction with the financial statements and the notes thereto included in our 2021 Annual Report on Form 10-K.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed unaudited financial statements and accompanying notes. Actual results could differ from those estimates.

A reclassification within Operating Costs and Expenses on the Condensed Statement of Net Income to include Cost of natural gas transportation within Operation and maintenance of approximately $17.6 million for the three months ended March 31, 2021 has been made to conform to the 2022 presentation.

Note 2 – Revenue Recognition

Revenue by Category

Our revenue disaggregation by major service line includes Natural gas sales, Natural gas transportation, Natural gas storage, and Other, which are separately presented on the Condensed Statement of Net Income.

Contract Liabilities

The following table presents a reconciliation of our contract liabilities:

	Three Months Ended March 31,
	2022		2021
	(Thousands)
Balance at beginning of period	$	205,030	$	215,596
Recognized in revenue	(2,638)		(2,638)
Balance at end of period	$	202,392	$	212,958

9

Notes (Continued) Table of Contents

Remaining Performance Obligations

Our remaining performance obligations primarily include reservation charges on contracted capacity on our firm transportation and storage contracts with customers. Amounts from certain contracts included in the table below, which are subject to periodic review and approval by the FERC, reflect the rates for such services in our current FERC tariffs, net of estimated reserve for refund, for the life of the related contracts; however, these rates may change based on future tariffs approved by the FERC and the amount and timing of these changes is not currently known. This table excludes the variable consideration component for commodity charges. Certain of our contracts contain evergreen and other renewal provisions for periods beyond the initial term of the contract. The remaining performance obligations as of March 31, 2022 do not consider potential future performance obligations for which the renewal has not been exercised and exclude contracts with customers for which the underlying facilities have not received FERC authorization to be placed into service.

The following table presents the amount of the contract liabilities balance expected to be recognized as revenue when performance obligations are satisfied and the transaction price allocated to the remaining performance obligations under certain contracts as of March 31, 2022.

	Contract Liabilities		Remaining Performance Obligations
	(Thousands)
2022 (nine months)	$	7,927	$	1,862,423
2023 (one year)	10,566		2,310,342
2024 (one year)	10,568		2,179,510
2025 (one year)	10,566		1,739,032
2026 (one year)	10,566		1,578,189
Thereafter	152,199		12,137,882
Total	$	202,392	$	21,807,378

Accounts Receivable

Receivables from contracts with customers are included within Receivables - Trade and Receivables - Affiliates, and receivables that are not related to contracts with customers are included within the balance of Receivables - Advances to affiliate and Receivables - Other on our Condensed Balance Sheet.

Note 3 – Contingent Liabilities and Commitments

Environmental Matters

We have had studies underway for many years to test some of our facilities for the presence of toxic and hazardous substances such as polychlorinated biphenyls (PCBs) and mercury to determine to what extent, if any, remediation may be necessary. We have also similarly evaluated past on-site disposal of hydrocarbons at a number of our facilities. We have worked closely with and responded to data requests from the U.S. Environmental Protection Agency (EPA) and state agencies regarding such potential contamination of certain of our sites. We are conducting environmental assessments and implementing a variety of remedial measures that may result in increases or decreases in the total estimated costs. At March 31, 2022, we had a balance of approximately $2.5 million for the expense portion of these estimated costs, $0.6 million recorded in Accrued liabilities and $1.9 million recorded in Other Long-Term Liabilities - Other on the Condensed Balance Sheet. At December 31, 2021, we had a balance of approximately $2.5 million for the expense portion of these estimated costs, $0.7 million recorded in Accrued liabilities and $1.8 million recorded in Other Long-Term Liabilities - Other on the Condensed Balance Sheet.

10

Notes (Continued) Table of Contents

We have been identified as a potentially responsible party (PRP) at various Superfund and state waste disposal sites. Based on present volumetric estimates and other factors, our estimated aggregate exposure for remediation of these sites is less than $0.5 million. The estimated remediation costs for all of these sites are included in the environmental liabilities discussed above. Liability under the Comprehensive Environmental Response, Compensation and Liability Act and applicable state law can be joint and several with other PRPs. Although volumetric allocation is a factor in assessing liability, it is not necessarily determinative; thus, the ultimate liability could be substantially greater than the amounts described above.

The EPA and various state regulatory agencies routinely propose and promulgate new rules, and issue updated guidance to existing rules. These rulemakings include, but are not limited to, rules for reciprocating internal combustion engine and combustion turbine maximum achievable control technology, review and updates to the National Ambient Air Quality Standards, and rules for new and existing source performance standards for volatile organic compounds and methane. We continuously monitor these regulatory changes and how they may impact our operations. Implementation of new or modified regulations may result in impacts to our operations and increase the cost additions to Total property, plant, and equipment, net on the Condensed Balance Sheet for both new and existing facilities in affected areas; however, due to regulatory uncertainty on final rule content and applicability timeframes, we are unable to reasonably estimate the cost of these regulatory impacts at this time.

We consider prudently incurred environmental assessment and remediation costs and the costs associated with compliance with environmental standards to be recoverable through rates. To date, we have been permitted recovery of environmental costs, and it is our intent to continue seeking recovery of such costs through future rate filings.

Other Matters

Various other proceedings are pending against us and are considered incidental to our operations.

Summary

We have disclosed all significant matters for which we are unable to reasonably estimate a range of possible loss. We estimate that for all matters for which we are able to reasonably estimate a range of loss, including those noted above and others that are not individually significant, our aggregate reasonably possible losses beyond amounts accrued for all of our contingent liabilities are immaterial to our expected future annual results of operations, liquidity and financial position. These calculations have been made without consideration of any potential recovery from third parties.

Note 4 – Debt and Financing Arrangements

Commercial Paper

Williams participates in a $3.5 billion commercial paper program and Williams’ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. At March 31, 2022, Williams had no outstanding commercial paper.

Credit Facility

We, along with Williams and Northwest Pipeline LLC, are party to a credit agreement with aggregate commitments available of $3.75 billion, with up to an additional $500 million increase in aggregate commitments available under certain circumstances. We and Northwest Pipeline LLC are each able to borrow up to $500 million under the credit facility to the extent not otherwise utilized by the other co-borrowers. At March 31, 2022, no letters of credit have been issued and no loans were outstanding under the credit facility.

11

Notes (Continued) Table of Contents

Other Financing Obligations

Dalton Expansion Project

At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $251.2 million and $251.9 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $2.6 million and $2.5 million, respectively.

Atlantic Sunrise Project

During the first three months of 2022 and 2021, we received an additional $0.3 million and $0.8 million, respectively, of funding from a co-owner for its proportionate share of construction costs related to its undivided ownership interest in certain parts of the project. This additional funding is reflected in Long-Term Debt on the Condensed Balance Sheet. At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $801.5 million and $807.1 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $22.9 million and $22.4 million, respectively.

Leidy South Project

During the first three months of 2022, we received an additional $2.6 million of funding from a co-owner for its proportionate share of construction costs related to its undivided joint ownership interest in certain parts of the project. This additional funding is reflected in Long-Term Debt on the Condensed Balance Sheet. At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $73.9 million and $71.5 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $0.7 million and $0.7 million, respectively.

Note 5 – ARO Trust

We are entitled to collect in rates the amounts necessary to fund our asset retirement obligations (ARO). We deposit monthly, into an external trust account (ARO Trust), the revenues specifically designated for ARO. The ARO Trust carries a moderate risk portfolio. The Money Market Funds held in our ARO Trust are considered investments. We measure the financial instruments held in our ARO Trust at fair value. However, in accordance with ASC Topic 980, Regulated Operations, both realized and unrealized gains and losses of the ARO Trust are recorded as regulatory assets or liabilities.

Pursuant to the approved stipulation and agreement in Docket No. RP18-1126 the annual funding obligation effective March 31, 2020 is approximately $16.0 million, with deposits made monthly.

Investments within the ARO Trust were as follows (in millions): 

	March 31, 2022				December 31, 2021
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Money Market Funds	$	9.7	$	9.7	$	5.9	$	5.9
U.S. Equity Funds	52.6		114.4		52.7		121.4
International Equity Funds	31.7		40.5		31.7		43.2
Municipal Bond Funds	87.7		85.0		87.7		90.0
Total	$	181.7	$	249.6	$	178.0	$	260.5

12

Notes (Continued) Table of Contents

Note 6 – Fair Value Measurements

The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of short-term financial assets that have variable interest rates (advances to affiliate), accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.

					Fair Value Measurements Using
	Carrying Amount		Fair Value		Quoted Prices In Active Markets for Identical Assets (Level  1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Millions)
Assets (liabilities) at March 31, 2022:
Measured on a recurring basis:
ARO Trust investments	$	249.6	$	249.6	$	249.6	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,292.0)		(6,206.2)		—		(6,206.2)		—
Assets (liabilities) at December 31, 2021:
Measured on a recurring basis:
ARO Trust investments	$	260.5	$	260.5	$	260.5	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,294.6)		(6,849.8)		—		(6,849.8)		—

Fair Value Methods

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

ARO Trust investments: We deposit a portion of our collected rates, pursuant to the terms of the Docket No. RP18-1126 rate case settlement, into the ARO Trust, which is specifically designated to fund future AROs. The ARO Trust invests in a portfolio of actively traded mutual funds that are measured at fair value on a recurring basis based on quoted prices in an active market and are reported in Other Assets-Other on the Condensed Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 5 – ARO Trust for more information.

Long-term debt, including current portion: The disclosed fair value of our long-term debt is determined primarily by a market approach using broker quoted indicative period-end bond prices. The quoted prices are based on observable transactions in less active markets for our debt or similar instruments. The fair value of the financing obligations associated with our Dalton, Atlantic Sunrise and Leidy South projects, which are included within long-term debt, were determined using an income approach (see Note 4 – Debt and Financing Arrangements).

Note 7 – Transactions with Affiliates

We are a participant in Williams’ cash management program, and we make advances to and receive advances from Williams. At March 31, 2022 and December 31, 2021, our advances to Williams totaled approximately $1,941.7 million and $1,669.4 million, respectively. These advances are represented by demand notes and are classified as Receivables - Advances to affiliate on the Condensed Balance Sheet. Advances are stated at the

13

Notes (Continued) Table of Contents

historical carrying amounts. Interest expense and income are recognized when earned and the collectability is reasonably assured. The interest rate on these intercompany demand notes is based upon the daily overnight investment rate paid on Williams’ excess cash at the end of each month, which was 0.12 percent at March 31, 2022. The interest income from these advances was minimal for each of the three months ended March 31, 2022 and 2021. Such interest income is included in Other (Income) and Other Expenses – Miscellaneous other expense, net on the Condensed Statement of Net Income.

Included in Operating Revenues on the Condensed Statement of Net Income are revenues received from affiliates of $21.1 million and $2.6 million for the three months ended March 31, 2022 and 2021, respectively. The rates charged to provide sales and services to affiliates are the same as those that are charged to similarly-situated nonaffiliated customers.

Included in Cost of natural gas sales on the Condensed Statement of Net Income are costs of gas purchased from affiliates of $5.4 million and $3.4 million for the three months ended March 31, 2022 and 2021, respectively. All gas purchases are made at market or contract prices.

We have no employees. Services necessary to operate our business are provided to us by Williams and certain affiliates of Williams. We reimburse Williams and its affiliates for all direct and indirect expenses incurred or payments made (including salary, bonus, incentive compensation and benefits) in connection with these services. Employees of Williams also provide general, administrative and management services to us, and we are charged for certain administrative expenses incurred by Williams. These charges are either directly identifiable or allocated to our assets. Direct charges are for goods and services provided by Williams at our request. Allocated charges are based on a three-factor formula, which considers revenues; property, plant and equipment; and payroll. In management’s estimation, the allocation methodologies used are reasonable and result in a reasonable allocation to us of our costs of doing business incurred by Williams. We have recorded approximately $79.6 million and $78.8 million for the three months ended March 31, 2022 and 2021, respectively, for these service expenses, which are primarily included in Operation and maintenance and Administrative and general expenses on the Condensed Statement of Net Income.

We provide services to certain of our affiliates. We recorded reductions in operating expenses for services provided to and reimbursed by our affiliates of $1.6 million and $1.7 million for the three months ended March 31, 2022 and 2021, respectively.

We declared and paid cash distributions to our parent totaling $57.5 million during the three months ended March 31, 2022. During April 2022, we declared and paid an additional cash distribution of $250.0 million to our parent. Our parent made contributions to us totaling $128.0 million and $60.0 million during the three months ended March 31, 2022 and 2021, respectively, to fund a portion of our expenditures for additions to property, plant, and equipment.

14

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

General

The following discussion should be read in conjunction with the Financial Statements, Notes and Management’s Discussion and Analysis contained in Items 7 and 8 of our 2021 Annual Report on Form 10-K and with the Condensed Financial Statements and Notes contained in this Form 10-Q.

Results of Operations

This analysis discusses financial results of our operations for the three-month periods ended March 31, 2022 and 2021. Variances due to the changes in natural gas prices and transportation volumes have little impact on revenues, because under our rate design methodology, the majority of overall cost of service is recovered through firm capacity reservation charges in our transportation rates.

We have cash out sales, which settle gas imbalances with shippers. In the course of providing transportation services to customers, we may receive different quantities of gas from shippers than the quantities delivered on behalf of those shippers. Additionally, we transport gas on various pipeline systems, which may deliver different quantities of gas on our behalf than the quantities of gas received from us. These transactions result in gas transportation and exchange imbalance receivables and payables. Our tariff includes a method whereby the majority of transportation imbalances are settled on a monthly basis through cash out sales or purchases. The cash out sales have no impact on our operating income.

During the first three months of 2022 we recognized Net Income of $288.4 million compared to $270.4 million during the first three months of 2021. The significant components of this year-over-year increase of $18.0 million (6.6 percent) are discussed further below.

Natural gas transportation revenues increased $39.0 million (6.7 percent), which was primarily attributable to:

•$25.6 million from our Leidy South project from additional capacity placed into service during the fourth quarter of 2021;

•$4.9 million higher electric power costs, which are recovered from our customers through transportation rates and are offset in Operating Costs and Expenses resulting in no net impact on our results of operations;

•$3.8 million from a combination of higher short-term firm transportation and overall demand;

•$2.2 million higher commodity revenues; and

•$2.2 million higher revenues related to a cash out surcharge (offset in Operating Costs and Expenses resulting in no net impact on our results of operations).

Operating Costs and Expenses, excluding the Cost of natural gas sales, which directly offsets Natural gas sales in Operating Revenues, increased $21.0 million (7.4 percent). This increase was primarily attributable to:

•$15.2 million increase in Operation and maintenance costs primarily resulting from (i) increased transportation costs of $11.4 million associated with Leidy South and (ii) higher electric power costs of $4.9 million (electric power costs are recovered from customers through transportation rates and are offset in Operating Revenues resulting in no net impact on our results of operations), partially offset by other immaterial variances;

•$14.8 million increase in Depreciation and amortization primarily as a result of an increase in ARO related depreciation, and to a lesser extent, additional assets placed into service;

•$2.6 million increase in Taxes — other than income taxes primarily due to an increase in estimated property taxes;

15

Management’s Discussion and Analysis (Continued) Table of Contents

•Partially offset by a $12.3 million favorable change in Other (income) expense, net driven by the deferral of $12.1 million of ARO related depreciation (offset in Depreciation and amortization resulting in no net impact on our results of operations), partially offset by the unfavorable change of $2.2 million related to a cash out surcharge (offset in Operating Revenues resulting in no net impact on our results of operations).

Other (income) and other expenses had an unfavorable change of $2.2 million (2.9 percent) driven by an increase of $2.3 million in interest expense primarily due to interest incurred on our financing obligation associated with the Leidy South project.

Pipeline Expansion Projects

Regional Energy Access

The Regional Energy Access Expansion involves an expansion of our existing natural gas transmission system to provide incremental firm transportation capacity from receipt points in northeastern Pennsylvania to multiple delivery points in Pennsylvania, New Jersey, and Maryland. We filed our certificate application for the project with the FERC on March 26, 2021. We plan to place the project into service as early as the fourth quarter of 2024, assuming timely receipt of all necessary regulatory approvals. The project is expected to increase capacity by 829 Mdth/d.

16

Item 4. Controls and Procedures

Disclosure Controls and Procedures

Our management, including our Senior Vice President and our Vice President and Chief Accounting Officer, does not expect that our disclosure controls and procedures (as defined in Rules 13a - 15(e) and 15d - 15(e) of the Securities Exchange Act, as amended) (Disclosure Controls) or our internal control over financial reporting (Internal Controls) will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. We monitor our Disclosure Controls and Internal Controls and make modifications as necessary; our intent in this regard is that the Disclosure Controls and Internal Controls will be modified as systems change and conditions warrant.

Evaluation of Disclosure Controls and Procedures

An evaluation of the effectiveness of the design and operation of our Disclosure Controls was performed as of the end of the period covered by this report. This evaluation was performed under the supervision and with the participation of our management, including our Senior Vice President and our Vice President and Chief Accounting Officer. Based upon that evaluation, our Senior Vice President and our Vice President and Chief Accounting Officer concluded that these Disclosure Controls are effective at a reasonable assurance level.

Changes in Internal Control over Financial Reporting

There have been no changes during the first quarter of 2022 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

Environmental

While it is not possible for us to predict the final outcome of any pending legal proceedings involving governmental authorities under federal, state, and local laws regulating the discharge of materials into the environment, we do not anticipate a material effect on our financial position if we were to receive an unfavorable outcome in any one or more of such proceedings. Our threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.

Other

The additional information called for by this item is provided in Note 3 – Contingent Liabilities and Commitments, included in the Notes to Financial Statements included under Part I, Item 1. Financial Statements of this Form 10-Q, which information is incorporated by reference into this item.

17

Item 1A. Risk Factors

Part I, Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2021 includes certain risk factors that could materially affect our business, financial condition, or future results. Those Risk Factors have not materially changed, except that they are supplemented or modified by the following risk factors. 

Difficult conditions in the global financial markets and the economy in general could negatively affect our business and results of operations.

Our business may be negatively impacted by adverse economic conditions or future disruptions in the global financial markets. Included among these potential negative impacts are industrial or economic contraction (including as a result of the COVID-19 pandemic) leading to reduced energy demand and lower prices for our products and services and increased difficulty in collecting amounts owed to us by our customers. The ongoing Russian invasion of Ukraine and the actions undertaken by western nations in response to Russia’s actions has had, and may continue to have, adverse impacts on global financial markets. We, along with Williams and Northwest Pipeline LLC, are party to a credit agreement with aggregate commitments available of $3.75 billion, with up to an additional $500 million increase in aggregate commitments available under certain circumstances. We and Northwest Pipeline LLC are each subject to a $500 million borrowing sublimit. As of March 31, 2022, we had a borrowing capacity of $500 million under such credit facility, but our ability to borrow under that facility could be impaired if one or more of our lenders fails to honor its contractual obligation to lend to us. If financing is not available when needed, or is available only on unfavorable terms, we may be unable to implement our business plans or otherwise take advantage of business opportunities or respond to competitive pressures. In addition, financial markets have periodically been affected by concerns over U.S. fiscal and monetary policies. These concerns, as well as actions taken by the U.S. federal government in response to these concerns, could significantly and adversely impact the global and U.S. economies and financial markets, which could negatively impact us in the manner described above.

Our business could be negatively impacted by acts of terrorism and related disruptions.

Given the volatile nature of the commodities we transport and store, our assets and the assets of our customers and others in our industry may be targets of terrorist activities. Uncertainty surrounding the Russian invasion of Ukraine, or other sustained military campaigns, may affect our operations in unpredictable ways, including the possibility that infrastructure facilities could be direct targets of, or indirect casualties of, an act of terrorism. A terrorist attack could create significant price volatility, disrupt our business, limit our access to capital markets, or cause significant harm to our operations, such as full or partial disruption to our ability to transport natural gas. Acts of terrorism, as well as events occurring in response to or in connection with acts of terrorism, could cause environmental repercussions that could result in a significant decrease in revenues or significant reconstruction or remediation costs, which could have a material adverse effect on our business, financial condition, results of operations, and cash flows.

A breach of our information technology infrastructure, including a breach caused by a cybersecurity attack on us or third parties with whom we are interconnected, may interfere with the safe operation of our assets, result in the disclosure of personal or proprietary information, and harm our reputation.

We rely on our information technology infrastructure to process, transmit, and store electronic information, including information we use to safely operate our assets. In addition to the oversight of our business provided by our Management Committee, the Williams’ Board of Directors has oversight responsibility with regard to enterprise-wide assessment of the major risks inherent in its businesses, including cybersecurity risks. Accordingly, the Williams’ Board of Directors reviews management’s efforts to address and mitigate such risks, including the establishment and implementation of policies to address cybersecurity threats. We have invested, and expect to continue to invest, significant time, manpower, and capital in our information technology infrastructure. However, the age, operating systems, or condition of our current information technology infrastructure and software assets and our ability to maintain and upgrade such assets could affect our ability to resist cybersecurity threats. While we believe that we maintain appropriate information security policies, practices, and protocols, we regularly face

18

cybersecurity and other security threats to our information technology infrastructure, which could include threats to our operational industrial control systems and safety systems that operate our pipelines, plants, and assets. We face unlawful attempts to gain access to our information technology infrastructure, including coordinated attacks from hackers, whether state-sponsored groups, “hacktivists”, or private individuals. We face the threat of theft and misuse of sensitive data and information, including customer and employee information. We also face attempts to gain access to information related to our assets through attempts to obtain unauthorized access by targeting acts of deception against individuals with legitimate access to physical locations or information. We also are subject to cybersecurity risks arising from the fact that our business operations are interconnected with third parties, including third-party pipelines, other facilities, and our contractors and vendors. In addition, the breach of certain business systems could affect our ability to correctly record, process, and report financial information. Breaches in our information technology infrastructure or physical facilities, or other disruptions, including those arising from theft, vandalism, fraud, or unethical conduct, which may increase as a result of the Russian invasion of Ukraine, could result in damage to or destruction of our assets, unnecessary waste, safety incidents, damage to the environment, reputational damage, potential liability, the loss of contracts, the imposition of significant costs associated with remediation and litigation, heightened regulatory scrutiny, increased insurance costs, and have a material adverse effect on our operations, financial condition, results of operations, and cash flows.

19

Item 6. Exhibits

The following instruments are included as exhibits to this report.

Exhibit Number	Description
2	Certificate of Conversion dated December 22, 2008 and effective December 31, 2008 (filed on February 24, 2011 as Exhibit 2.1 to our annual report on Form 10-K (File No. 001-07584) and incorporated herein by reference).
3.1	Certificate of Formation dated December 22, 2008 and effective December 31, 2008 (filed on February 24, 2011 as Exhibit 3.1 to our annual report on Form 10-K (File No. 001-07584) and incorporated herein by reference).
3.2	Amended and Restated Operating Agreement of Transcontinental Gas Pipe Line Company, LLC dated February 17, 2010 (filed on October 28, 2010 as Exhibit 3.2 to our quarterly report on Form 10-Q (File No. 001-07584) and incorporated herein by reference).
31.1*	Certification of Principal Executive Officer pursuant to Rules 13a-14(a) and 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Principal Financial Officer pursuant to Rules 13a-14(a) and 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended, and Item 601(b)(31) of Regulation S-K, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32**	Certification of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	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*	XBRL Taxonomy Extension Schema.
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase.
101.DEF*	XBRL Taxonomy Extension Definition Linkbase.
101.LAB*	XBRL Taxonomy Extension Label Linkbase.
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase.
104*	Cover Page Interactive Data File. The cover page interactive data file does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101).

*	Filed herewith.
**	Furnished herewith.

20

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC (Registrant)
Dated:	May 2, 2022	By:	/s/ Billeigh W. Mark
			Billeigh W. Mark
			Controller
			(Principal Accounting Officer)

EX-31.1

Exhibit 31.1

SECTION 302 CERTIFICATION

I, Scott A. Hallam, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Transcontinental Gas Pipe Line Company, LLC;

2.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;

3.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;

4.The registrant’s other certifying officer(s) 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

5.The registrant’s other certifying officer(s) 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: May 2, 2022

By:	/s/ Scott A. Hallam
	Scott A. Hallam
	Senior Vice President
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

SECTION 302 CERTIFICATION

I, Mary A. Hausman, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Transcontinental Gas Pipe Line Company, LLC;

2.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;

3.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;

4.The registrant’s other certifying officer(s) 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

5.The registrant’s other certifying officer(s) 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: May 2, 2022

By:	/s/ Mary A. Hausman
	Mary A. Hausman
	Vice President and Chief Accounting Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

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 of Transcontinental Gas Pipe Line Company, LLC (the “Company”) on Form 10-Q for the period ending March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned hereby certifies, in his capacity as an officer of the Company, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

(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 Company.

/s/ Scott A. Hallam

Scott A. Hallam

Senior Vice President

May 2, 2022

/s/ Mary A. Hausman

Mary A. Hausman

Vice President and Chief Accounting Officer

May 2, 2022

A signed original of this written statement required by Section 906 has been provided to, and will be retained by, the Company and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Report and shall not be considered filed as part of the Report.

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 02, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	1-7584
Entity Registrant Name	Transcontinental Gas Pipe Line Company, LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-1079400
Entity Address, Address Line One	2800 Post Oak Boulevard
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	215-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000099250
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		0

XML

Condensed Statement of Net Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Revenues:
Natural gas sales	$ 15,645	$ 14,224
Natural gas transportation	621,537	582,557
Natural gas storage	44,158	42,502
Other	5,128	4,494
Total operating revenues	686,468	643,777
Operating Costs and Expenses:
Cost of natural gas sales	15,645	14,224
Operation and maintenance	111,296	96,084
Administrative and general	51,549	50,753
Depreciation and amortization	132,562	117,797
Taxes - other than income taxes	27,114	24,528
Regulatory credit resulting from tax rate changes	(7,688)	(7,688)
Other (income) expense, net	(10,888)	1,423
Total operating costs and expenses	319,590	297,121
Operating Income	366,878	346,656
Other (Income) and Other Expenses:
Interest expense	82,437	80,175
Allowance for equity and borrowed funds used during construction (AFUDC)	(4,857)	(3,997)
Miscellaneous other expense, net	897	52
Total other (income) and other expenses	78,477	76,230
Net Income	$ 288,401	$ 270,426

XML

Condensed Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash	$ 0	$ 0
Receivables:
Affiliates	5,575	6,978
Advances to affiliate	1,941,659	1,669,368
Trade	216,736	234,680
Other (less allowance of $6,229 and $6,222 in 2022 and 2021, respectively)	10,685	12,977
Transportation and exchange gas receivables	3,623	7,685
Inventories	58,147	54,437
Regulatory assets	132,401	114,351
Other	14,179	17,058
Total current assets	2,383,005	2,117,534
Property, Plant and Equipment:
Natural gas transmission plant	17,750,482	17,713,050
Less-Accumulated depreciation and amortization	5,293,340	5,227,128
Total property, plant and equipment, net	12,457,142	12,485,922
Other Assets:
Regulatory assets	275,356	253,081
Right-of-use assets	65,985	68,817
Other	280,336	292,957
Total other assets	621,677	614,855
Total assets	15,461,824	15,218,311
Payables:
Affiliates	57,882	69,128
Trade and other	113,094	184,405
Transportation and exchange gas payables	6,112	10,125
Regulatory liabilities	57,781	57,369
Accrued liabilities	184,153	223,013
Long-term debt due within one year	26,182	25,594
Total current liabilities	445,204	569,634
Long-Term Debt	5,265,835	5,269,024
Other Long-Term Liabilities:
Asset retirement obligations	470,884	459,969
Regulatory liabilities	937,771	932,101
Contract liabilities	191,826	194,464
Lease liability	66,985	68,582
Other	4,210	4,281
Total other long-term liabilities	1,671,676	1,659,397
Contingent Liabilities and Commitments (Note 3)
Member’s Equity:
Member's capital	5,088,499	4,960,499
Retained earnings	2,990,610	2,759,757
Total member's equity	8,079,109	7,720,256
Total liabilities and member's equity	$ 15,461,824	$ 15,218,311

XML

Condensed Balance Sheet (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 6,229	$ 6,222

XML

Condensed Statement of Changes in Member's Equity (Unaudited) - USD ($) $ in Thousands	Total	Member's Capital	Retained Earnings
Balance at beginning of period at Dec. 31, 2020		$ 4,543,499	$ 2,037,320
Cash contributions from parent	$ 60,000	60,000
Net income	270,426		270,426
Cash distributions to parent	0		0
Balance at end of period at Mar. 31, 2021	6,911,245	4,603,499	2,307,746
Balance at beginning of period at Dec. 31, 2021	7,720,256	4,960,499	2,759,757
Cash contributions from parent	128,000	128,000
Net income	288,401		288,401
Cash distributions to parent	(57,548)		(57,548)
Balance at end of period at Mar. 31, 2022	$ 8,079,109	$ 5,088,499	$ 2,990,610

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Condensed Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES:
Net income	$ 288,401	$ 270,426
Adjustments to reconcile net cash provided (used) by operating activities:
Depreciation and amortization	132,562	117,797
Allowance for equity funds used during construction (equity AFUDC)	(3,834)	(3,052)
Regulatory credit resulting from tax rate changes	(7,688)	(7,688)
Changes in operating assets and liabilities:
Receivables - affiliates	1,403	(277)
Receivables - trade and other	20,229	10,046
Transportation and exchange gas receivable	4,062	(3,051)
Inventories	(3,710)	(4,313)
Payables - affiliates	(11,246)	12,511
Payables - trade	(44,264)	(26,077)
Accrued liabilities	(38,489)	(22,381)
Asset retirement obligations	3,380	4,653
Contract liabilities	(2,638)	(2,638)
Other, net	(21,507)	2,748
Net cash provided by operating activities	316,661	348,704
FINANCING ACTIVITIES:
Proceeds from other financing obligations	2,843	817
Payments on other financing obligations	(6,136)	(5,430)
Payments for debt issuance costs	(16)	(32)
Cash distributions to parent	(57,548)	0
Cash contributions from parent	128,000	60,000
Net cash provided by financing activities	67,143	55,355
INVESTING ACTIVITIES:
Capital expenditures	(97,124)	(89,200)
Contributions and advances for construction costs, net	(4,655)	12,454
Disposal of property, plant and equipment, net	(5,940)	(1,635)
Advances to affiliate, net	(272,291)	(326,104)
Purchase of ARO Trust investments	(4,875)	(14,573)
Proceeds from sale of ARO Trust investments	1,081	14,999
Net cash used by investing activities	(383,804)	(404,059)
Increase (decrease) in cash	0	0
Cash at beginning of period	0	0
Cash at end of period	0	0
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Increase to property, plant and equipment, exclusive of equity AFUDC	(65,262)	(84,631)
Changes in related accounts payable and accrued liabilities	(31,862)	(4,569)
Capital expenditures	$ (97,124)	$ (89,200)

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Basis of Presentation (Notes)

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

In this report, Transcontinental Gas Pipe Line Company, LLC (Transco) is at times referred to in the first person as “we,” “us” or “our.”

Transco is indirectly owned by The Williams Companies, Inc. (Williams), a publicly traded Delaware corporation. We own and operate an interstate natural gas pipeline system that is regulated by the Federal Energy Regulatory Commission (FERC).

General

The accompanying condensed unaudited financial statements have been prepared from our books and records. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (GAAP) have been condensed or omitted in this Form 10-Q pursuant to Securities and Exchange Commission rules and regulations. The condensed unaudited financial statements include all normal recurring adjustments and others which, in the opinion of our management, are necessary to present fairly our interim financial statements. These condensed unaudited financial statements should be read in conjunction with the financial statements and the notes thereto included in our 2021 Annual Report on Form 10-K.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed unaudited financial statements and accompanying notes. Actual results could differ from those estimates.

A reclassification within Operating Costs and Expenses on the Condensed Statement of Net Income to include Cost of natural gas transportation within Operation and maintenance of approximately $17.6 million for the three months ended March 31, 2021 has been made to conform to the 2022 presentation.

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Revenue Recognition (Notes)

3 Months Ended

Mar. 31, 2022

Revenue Recognition [Abstract]

Revenue Recognition

Revenue Recognition

Revenue by Category

Our revenue disaggregation by major service line includes Natural gas sales, Natural gas transportation, Natural gas storage, and Other, which are separately presented on the Condensed Statement of Net Income.

Contract Liabilities

The following table presents a reconciliation of our contract liabilities:

	Three Months Ended March 31,
	2022		2021
	(Thousands)
Balance at beginning of period	$	205,030	$	215,596
Recognized in revenue	(2,638)		(2,638)
Balance at end of period	$	202,392	$	212,958

Remaining Performance Obligations

Our remaining performance obligations primarily include reservation charges on contracted capacity on our firm transportation and storage contracts with customers. Amounts from certain contracts included in the table below, which are subject to periodic review and approval by the FERC, reflect the rates for such services in our current FERC tariffs, net of estimated reserve for refund, for the life of the related contracts; however, these rates may change based on future tariffs approved by the FERC and the amount and timing of these changes is not currently known. This table excludes the variable consideration component for commodity charges. Certain of our contracts contain evergreen and other renewal provisions for periods beyond the initial term of the contract. The remaining performance obligations as of March 31, 2022 do not consider potential future performance obligations for which the renewal has not been exercised and exclude contracts with customers for which the underlying facilities have not received FERC authorization to be placed into service.

The following table presents the amount of the contract liabilities balance expected to be recognized as revenue when performance obligations are satisfied and the transaction price allocated to the remaining performance obligations under certain contracts as of March 31, 2022.

	Contract Liabilities		Remaining Performance Obligations
	(Thousands)
2022 (nine months)	$	7,927	$	1,862,423
2023 (one year)	10,566		2,310,342
2024 (one year)	10,568		2,179,510
2025 (one year)	10,566		1,739,032
2026 (one year)	10,566		1,578,189
Thereafter	152,199		12,137,882
Total	$	202,392	$	21,807,378

Accounts Receivable

Receivables from contracts with customers are included within Receivables - Trade and Receivables - Affiliates, and receivables that are not related to contracts with customers are included within the balance of Receivables - Advances to affiliate and Receivables - Other on our Condensed Balance Sheet.

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Contingent Liabilities and Commitments (Notes)

3 Months Ended

Mar. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Contingent Liabilities and Commitments

Contingent Liabilities and Commitments

Environmental Matters

We have had studies underway for many years to test some of our facilities for the presence of toxic and hazardous substances such as polychlorinated biphenyls (PCBs) and mercury to determine to what extent, if any, remediation may be necessary. We have also similarly evaluated past on-site disposal of hydrocarbons at a number of our facilities. We have worked closely with and responded to data requests from the U.S. Environmental Protection Agency (EPA) and state agencies regarding such potential contamination of certain of our sites. We are conducting environmental assessments and implementing a variety of remedial measures that may result in increases or decreases in the total estimated costs. At March 31, 2022, we had a balance of approximately $2.5 million for the expense portion of these estimated costs, $0.6 million recorded in Accrued liabilities and $1.9 million recorded in Other Long-Term Liabilities - Other on the Condensed Balance Sheet. At December 31, 2021, we had a balance of approximately $2.5 million for the expense portion of these estimated costs, $0.7 million recorded in Accrued liabilities and $1.8 million recorded in Other Long-Term Liabilities - Other on the Condensed Balance Sheet.

We have been identified as a potentially responsible party (PRP) at various Superfund and state waste disposal sites. Based on present volumetric estimates and other factors, our estimated aggregate exposure for remediation of these sites is less than $0.5 million. The estimated remediation costs for all of these sites are included in the environmental liabilities discussed above. Liability under the Comprehensive Environmental Response, Compensation and Liability Act and applicable state law can be joint and several with other PRPs. Although volumetric allocation is a factor in assessing liability, it is not necessarily determinative; thus, the ultimate liability could be substantially greater than the amounts described above.

The EPA and various state regulatory agencies routinely propose and promulgate new rules, and issue updated guidance to existing rules. These rulemakings include, but are not limited to, rules for reciprocating internal combustion engine and combustion turbine maximum achievable control technology, review and updates to the National Ambient Air Quality Standards, and rules for new and existing source performance standards for volatile organic compounds and methane. We continuously monitor these regulatory changes and how they may impact our operations. Implementation of new or modified regulations may result in impacts to our operations and increase the cost additions to Total property, plant, and equipment, net on the Condensed Balance Sheet for both new and existing facilities in affected areas; however, due to regulatory uncertainty on final rule content and applicability timeframes, we are unable to reasonably estimate the cost of these regulatory impacts at this time.

We consider prudently incurred environmental assessment and remediation costs and the costs associated with compliance with environmental standards to be recoverable through rates. To date, we have been permitted recovery of environmental costs, and it is our intent to continue seeking recovery of such costs through future rate filings.

Other Matters

Various other proceedings are pending against us and are considered incidental to our operations.

Summary

We have disclosed all significant matters for which we are unable to reasonably estimate a range of possible loss. We estimate that for all matters for which we are able to reasonably estimate a range of loss, including those noted above and others that are not individually significant, our aggregate reasonably possible losses beyond amounts accrued for all of our contingent liabilities are immaterial to our expected future annual results of operations, liquidity and financial position. These calculations have been made without consideration of any potential recovery from third parties.

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Debt and Financing Arrangements (Notes)

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Debt and Financing Arrangements

Debt and Financing Arrangements

Commercial Paper

Williams participates in a $3.5 billion commercial paper program and Williams’ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. At March 31, 2022, Williams had no outstanding commercial paper.

Credit Facility

We, along with Williams and Northwest Pipeline LLC, are party to a credit agreement with aggregate commitments available of $3.75 billion, with up to an additional $500 million increase in aggregate commitments available under certain circumstances. We and Northwest Pipeline LLC are each able to borrow up to $500 million under the credit facility to the extent not otherwise utilized by the other co-borrowers. At March 31, 2022, no letters of credit have been issued and no loans were outstanding under the credit facility.

Other Financing Obligations

Dalton Expansion Project

At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $251.2 million and $251.9 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $2.6 million and $2.5 million, respectively.

Atlantic Sunrise Project

During the first three months of 2022 and 2021, we received an additional $0.3 million and $0.8 million, respectively, of funding from a co-owner for its proportionate share of construction costs related to its undivided ownership interest in certain parts of the project. This additional funding is reflected in Long-Term Debt on the Condensed Balance Sheet. At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $801.5 million and $807.1 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $22.9 million and $22.4 million, respectively.

Leidy South Project

During the first three months of 2022, we received an additional $2.6 million of funding from a co-owner for its proportionate share of construction costs related to its undivided joint ownership interest in certain parts of the project. This additional funding is reflected in Long-Term Debt on the Condensed Balance Sheet. At March 31, 2022 and December 31, 2021, the amount included in Long-Term Debt on the Condensed Balance Sheet for this financing obligation is $73.9 million and $71.5 million, and the amount included in Long-term debt due within one year on the Condensed Balance Sheet for this financing obligation is $0.7 million and $0.7 million, respectively.

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ARO Trust (Notes)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

ARO Trust

ARO Trust

We are entitled to collect in rates the amounts necessary to fund our asset retirement obligations (ARO). We deposit monthly, into an external trust account (ARO Trust), the revenues specifically designated for ARO. The ARO Trust carries a moderate risk portfolio. The Money Market Funds held in our ARO Trust are considered investments. We measure the financial instruments held in our ARO Trust at fair value. However, in accordance with ASC Topic 980, Regulated Operations, both realized and unrealized gains and losses of the ARO Trust are recorded as regulatory assets or liabilities.

Pursuant to the approved stipulation and agreement in Docket No. RP18-1126 the annual funding obligation effective March 31, 2020 is approximately $16.0 million, with deposits made monthly.

Investments within the ARO Trust were as follows (in millions): 

	March 31, 2022				December 31, 2021
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Money Market Funds	$	9.7	$	9.7	$	5.9	$	5.9
U.S. Equity Funds	52.6		114.4		52.7		121.4
International Equity Funds	31.7		40.5		31.7		43.2
Municipal Bond Funds	87.7		85.0		87.7		90.0
Total	$	181.7	$	249.6	$	178.0	$	260.5

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Fair Value Measurements (Notes)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of short-term financial assets that have variable interest rates (advances to affiliate), accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.

					Fair Value Measurements Using
	Carrying Amount		Fair Value		Quoted Prices In Active Markets for Identical Assets (Level  1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Millions)
Assets (liabilities) at March 31, 2022:
Measured on a recurring basis:
ARO Trust investments	$	249.6	$	249.6	$	249.6	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,292.0)		(6,206.2)		—		(6,206.2)		—
Assets (liabilities) at December 31, 2021:
Measured on a recurring basis:
ARO Trust investments	$	260.5	$	260.5	$	260.5	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,294.6)		(6,849.8)		—		(6,849.8)		—

Fair Value Methods

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

ARO Trust investments: We deposit a portion of our collected rates, pursuant to the terms of the Docket No. RP18-1126 rate case settlement, into the ARO Trust, which is specifically designated to fund future AROs. The ARO Trust invests in a portfolio of actively traded mutual funds that are measured at fair value on a recurring basis based on quoted prices in an active market and are reported in Other Assets-Other on the Condensed Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 5 – ARO Trust for more information.

Long-term debt, including current portion: The disclosed fair value of our long-term debt is determined primarily by a market approach using broker quoted indicative period-end bond prices. The quoted prices are based on observable transactions in less active markets for our debt or similar instruments. The fair value of the financing obligations associated with our Dalton, Atlantic Sunrise and Leidy South projects, which are included within long-term debt, were determined using an income approach (see Note 4 – Debt and Financing Arrangements).

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Transactions with Affiliates (Notes)

3 Months Ended

Mar. 31, 2022

Related Party Transactions [Abstract]

Transactions with Affiliates

Transactions with Affiliates We are a participant in Williams’ cash management program, and we make advances to and receive advances from Williams. At March 31, 2022 and December 31, 2021, our advances to Williams totaled approximately $1,941.7 million and $1,669.4 million, respectively. These advances are represented by demand notes and are classified as Receivables - Advances to affiliate on the Condensed Balance Sheet. Advances are stated at the

historical carrying amounts. Interest expense and income are recognized when earned and the collectability is reasonably assured. The interest rate on these intercompany demand notes is based upon the daily overnight investment rate paid on Williams’ excess cash at the end of each month, which was 0.12 percent at March 31, 2022. The interest income from these advances was minimal for each of the three months ended March 31, 2022 and 2021. Such interest income is included in Other (Income) and Other Expenses – Miscellaneous other expense, net on the Condensed Statement of Net Income.

Included in Operating Revenues on the Condensed Statement of Net Income are revenues received from affiliates of $21.1 million and $2.6 million for the three months ended March 31, 2022 and 2021, respectively. The rates charged to provide sales and services to affiliates are the same as those that are charged to similarly-situated nonaffiliated customers.

Included in Cost of natural gas sales on the Condensed Statement of Net Income are costs of gas purchased from affiliates of $5.4 million and $3.4 million for the three months ended March 31, 2022 and 2021, respectively. All gas purchases are made at market or contract prices.

We have no employees. Services necessary to operate our business are provided to us by Williams and certain affiliates of Williams. We reimburse Williams and its affiliates for all direct and indirect expenses incurred or payments made (including salary, bonus, incentive compensation and benefits) in connection with these services. Employees of Williams also provide general, administrative and management services to us, and we are charged for certain administrative expenses incurred by Williams. These charges are either directly identifiable or allocated to our assets. Direct charges are for goods and services provided by Williams at our request. Allocated charges are based on a three-factor formula, which considers revenues; property, plant and equipment; and payroll. In management’s estimation, the allocation methodologies used are reasonable and result in a reasonable allocation to us of our costs of doing business incurred by Williams. We have recorded approximately $79.6 million and $78.8 million for the three months ended March 31, 2022 and 2021, respectively, for these service expenses, which are primarily included in Operation and maintenance and Administrative and general expenses on the Condensed Statement of Net Income.

We provide services to certain of our affiliates. We recorded reductions in operating expenses for services provided to and reimbursed by our affiliates of $1.6 million and $1.7 million for the three months ended March 31, 2022 and 2021, respectively.

We declared and paid cash distributions to our parent totaling $57.5 million during the three months ended March 31, 2022. During April 2022, we declared and paid an additional cash distribution of $250.0 million to our parent. Our parent made contributions to us totaling $128.0 million and $60.0 million during the three months ended March 31, 2022 and 2021, respectively, to fund a portion of our expenditures for additions to property, plant, and equipment.

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Revenue Recognition Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2022

Revenue Recognition [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table presents a reconciliation of our contract liabilities:

	Three Months Ended March 31,
	2022		2021
	(Thousands)
Balance at beginning of period	$	205,030	$	215,596
Recognized in revenue	(2,638)		(2,638)
Balance at end of period	$	202,392	$	212,958

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table presents the amount of the contract liabilities balance expected to be recognized as revenue when performance obligations are satisfied and the transaction price allocated to the remaining performance obligations under certain contracts as of March 31, 2022.

	Contract Liabilities		Remaining Performance Obligations
	(Thousands)
2022 (nine months)	$	7,927	$	1,862,423
2023 (one year)	10,566		2,310,342
2024 (one year)	10,568		2,179,510
2025 (one year)	10,566		1,739,032
2026 (one year)	10,566		1,578,189
Thereafter	152,199		12,137,882
Total	$	202,392	$	21,807,378

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ARO Trust (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

ARO Trust

Investments within the ARO Trust were as follows (in millions): 

	March 31, 2022				December 31, 2021
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Money Market Funds	$	9.7	$	9.7	$	5.9	$	5.9
U.S. Equity Funds	52.6		114.4		52.7		121.4
International Equity Funds	31.7		40.5		31.7		43.2
Municipal Bond Funds	87.7		85.0		87.7		90.0
Total	$	181.7	$	249.6	$	178.0	$	260.5

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of short-term financial assets that have variable interest rates (advances to affiliate), accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.

					Fair Value Measurements Using
	Carrying Amount		Fair Value		Quoted Prices In Active Markets for Identical Assets (Level  1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(Millions)
Assets (liabilities) at March 31, 2022:
Measured on a recurring basis:
ARO Trust investments	$	249.6	$	249.6	$	249.6	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,292.0)		(6,206.2)		—		(6,206.2)		—
Assets (liabilities) at December 31, 2021:
Measured on a recurring basis:
ARO Trust investments	$	260.5	$	260.5	$	260.5	$	—	$	—
Additional disclosures:
Long-term debt, including current portion	(5,294.6)		(6,849.8)		—		(6,849.8)		—

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Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification [Line Items]
Operation and maintenance	$ 111,296	$ 96,084
Previously Reported [Member]
Reclassification [Line Items]
Cost of natural gas transportation		17,600
Revision of Prior Period, Reclassification, Adjustment [Member]
Reclassification [Line Items]
Operation and maintenance		$ 17,600

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Revenue Recognition Revenue Recogntion Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Contract With Customer, Liability [Line Items]
Balance at beginning of period	$ 205,030	$ 215,596
Recognized in revenue	(2,638)	(2,638)
Balance at end of period	$ 202,392	$ 212,958

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Revenue Recognition Contract Liabilities Performance Obligation (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 202,392	$ 205,030	$ 212,958	$ 215,596
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 7,927
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Performance Obligations Related To Contract Liabilities [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 10,566
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Performance Obligations Related To Contract Liabilities [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 10,568
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Performance Obligations Related To Contract Liabilities [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 10,566
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Performance Obligations Related To Contract Liabilities [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 10,566
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Performance Obligations Related To Contract Liabilities [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with Customer, Liability	$ 152,199
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Performance Obligations Related To Contract Liabilities [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

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Revenue Recognition Remaining Performance Obligation (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 21,807,378
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 1,862,423
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Remaining Performance Obligations [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 2,310,342
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Remaining Performance Obligations [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 2,179,510
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Remaining Performance Obligations [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 1,739,032
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Remaining Performance Obligations [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 1,578,189
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Remaining Performance Obligations [Member]
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, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 12,137,882
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Remaining Performance Obligations [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

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Contingent Liabilities and Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Environmental assessment and remediation [Member]
Site Contingency [Line Items]
Accrued environmental assessment and remediation costs, total	$ 2.5	$ 2.5
Accrued environmental assessment and remediation costs, current	0.6	0.7
Accrued environmental assessment and remediation costs, noncurrent	1.9	$ 1.8
Potentially responsible party at various Superfund and state waste disposal sites [Member] | Maximum [Member]
Site Contingency [Line Items]
Site Contingency, Loss Exposure Not Accrued, Best Estimate	$ 0.5

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Debt and Financing Arrangements Line of Credit Facility (Details)	Mar. 31, 2022 USD ($)
Commercial Paper | Williams Companies Inc
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,500,000,000
Commercial paper, outstanding	0
Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000,000
Credit Agreement | Williams Companies Inc
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,750,000,000
Additional Amount By Which Credit Facility Can Be Increased	500,000,000
Letters of Credit Outstanding, Amount	0
Line of credit facility, loans outstanding	$ 0

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Debt and Financing Arrangements Long-Term Debt Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Long-Term Debt	$ 5,265,835		$ 5,269,024
Long-term debt due within one year	26,182		25,594
Proceeds from other financing obligations	2,843	$ 817
Dalton Expansion Project
Debt Instrument [Line Items]
Long-Term Debt	251,200		251,900
Long-term debt due within one year	2,600		2,500
Atlantic Sunrise Project
Debt Instrument [Line Items]
Long-Term Debt	801,500		807,100
Long-term debt due within one year	22,900		22,400
Proceeds from other financing obligations	300	$ 800
Leidy South Project
Debt Instrument [Line Items]
Long-Term Debt	73,900		71,500
Long-term debt due within one year	700		$ 700
Proceeds from other financing obligations	$ 2,600

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ARO Trust (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Cost	$ 181.7	$ 178.0
Debt and Equity Securities, Fair Value	249.6	260.5
External trust [Member]
Debt Securities, Available-for-sale [Line Items]
Funding obligation	16.0
Money Market Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Cost	9.7	5.9
Debt and Equity Securities, Fair Value	9.7	5.9
U.S. Equity Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Cost	52.6	52.7
Debt and Equity Securities, Fair Value	114.4	121.4
International Equity Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Cost	31.7	31.7
Debt and Equity Securities, Fair Value	40.5	43.2
Municipal Bond Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Cost	87.7	87.7
Debt and Equity Securities, Fair Value	$ 85.0	$ 90.0

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Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	$ 249.6	$ 260.5
Fair Value, Inputs, Level 1 [Member]
Additional Fair Value Elements [Abstract]
Long-term debt, including current portion	0.0	0.0
Fair Value, Inputs, Level 2 [Member]
Additional Fair Value Elements [Abstract]
Long-term debt, including current portion	(6,206.2)	(6,849.8)
Fair Value, Inputs, Level 3 [Member]
Additional Fair Value Elements [Abstract]
Long-term debt, including current portion	0.0	0.0
Reported Value Measurement [Member]
Additional Fair Value Elements [Abstract]
Long-term debt, including current portion	(5,292.0)	(5,294.6)
Estimate of Fair Value Measurement [Member]
Additional Fair Value Elements [Abstract]
Long-term debt, including current portion	(6,206.2)	(6,849.8)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	249.6	260.5
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	0.0	0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	0.0	0.0
Fair Value, Recurring [Member] | Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	249.6	260.5
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
ARO Trust investments	$ 249.6	$ 260.5

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Transactions with Affiliates Related Party Transations (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) employee	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Advances to affiliate, net		$ 1,941,700		$ 1,669,400
Related party transaction, rate		0.12%
Operating revenues, related party		$ 21,100	$ 2,600
Cost of natural gas sales, related party		$ 5,400	3,400
Entity number of employees | employee		0
Expenses, related party		$ 79,600	78,800
Reduction to expenses		1,600	1,700
Equity distributions to parent		57,548	0
Cash contributions from Parent		$ 128,000	$ 60,000
Subsequent Event
Related Party Transaction [Line Items]
Equity distributions to parent	$ 250,000