10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2013

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)

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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).    Yes  þ   No  ¨

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

Large accelerated filer ¨ Accelerated filer ¨ Non-accelerated filer þ Smaller reporting company ¨

(Do not check if a smaller reporting company)

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

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.

TRANSCONTINTENTAL GAS PIPE LINE COMPANY, LLC

Index

	Page
Part I. Financial Information:
Item 1. Financial Statements
Condensed Consolidated Statement of Comprehensive Income —Three and Nine Months Ended September 30, 2013 and 2012	3
Condensed Consolidated Balance Sheet — September 30, 2013 and December 31, 2012	4
Condensed Consolidated Statement of Cash Flows — Nine Months Ended September 30, 2013 and 2012	6
Notes to Condensed Consolidated Financial Statements	7
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	13
Item 4. Controls and Procedures	17
Part II. Other Information	17
Item 1. Legal Proceedings	17
Item 6. Exhibits	18

Forward Looking Statements

Certain matters contained in this report include “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. 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. We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995.

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,” “assumes,” “forecasts,” “intends,” “might,” “goals,” “objectives,” “targets,” “planned,” “potential,” “projects,” “scheduled,” “will,” “guidance,” “outlook,” “in service date” or other similar expressions. These statements are based on management’s beliefs and assumptions and on information currently available to management and include, among others, statements regarding:

• Amounts and nature of future capital expenditures;

• Expansion and growth of our business and operations;

• Financial condition and liquidity;

• Business strategy;

• Cash flow from operations or results of operations;

• Rate case filings;

• Natural gas prices, supply and demand; and

• Demand for our services.

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

1

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:

• Availability of supplies, market demand, and volatility of prices;

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

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

• Development of alternative energy sources;

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

• Costs of, changes in, or the results of laws, government regulations (including safety and environmental regulations), environmental liabilities, litigation, and rate proceedings;

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

• Changes in maintenance and construction costs;

• Changes in the current geopolitical situation;

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

• Risks related to strategy and financing, including restrictions stemming from our debt agreements, future changes in our credit ratings, and the availability and cost of capital;

• Risks associated with weather and natural phenomena including climate conditions;

• Acts of terrorism, including cybersecurity threats 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 to 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, 2012.

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PART I — FINANCIAL INFORMATION

ITEM 1. Financial Statements.

TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(Thousands of Dollars)

(Unaudited)

	Three months ended   September 30,						Nine months ended   September 30,
	2013			2012			2013			2012
Operating Revenues:
Natural gas sales	$	27,282		$	15,828		$	87,866		$	36,691
Natural gas transportation	268,426			251,691			808,002			761,659
Natural gas storage	35,736			34,714			107,243			105,171
Other	811			724			3,085			3,079
Total operating revenues	332,255			302,957			1,006,196			906,600
Operating Costs and Expenses:
Cost of natural gas sales	27,282			15,828			87,866			36,691
Cost of natural gas transportation	3,056			8,104			22,053			27,264
Operation and maintenance	70,294			79,991			194,008			219,518
Administrative and general	43,747			42,443			135,767			131,225
Depreciation and amortization	66,989			66,693			198,148			199,068
Taxes — other than income taxes	11,318			11,133			33,879			33,660
Other (income) expense, net	12,562			7,753			24,750			31,214
Total operating costs and expenses	235,248			231,945			696,471			678,640
Operating Income	97,007			71,012			309,725			227,960
Other (Income) and Other Expenses:
Interest expense	21,416			21,132			62,716			68,518
Allowance for equity and borrowed funds used during construction (AFUDC)	(5,002		)	(5,886		)	(15,352		)	(14,468		)
Equity in earnings of unconsolidated affiliates	(1,493		)	(2,127		)	(4,234		)	(5,395		)
Miscellaneous other (income) expenses, net	(1,632		)	(2,069		)	(4,747		)	(4,121		)
Total other (income) and other expenses	13,289			11,050			38,383			44,534
Net Income	83,718			59,962			271,342			183,426
Other comprehensive income (loss):
Equity interest in unrealized gain (loss) on interest rate hedges (includes $83 and $68 for the three months ended and $244 and $145 for the nine months ended September 30, 2013 and September 30, 2012, respectively, of accumulated other comprehensive income reclassification for realized losses on interest rate hedges)	(102		)	(283		)	404			(441		)
Comprehensive Income	$	83,616		$	59,679		$	271,746		$	182,985

See accompanying notes.

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TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

CONDENSED CONSOLIDATED BALANCE SHEET

(Thousands of Dollars)

(Unaudited)

	September 30, 2013		December 31, 2012
ASSETS
Current Assets:
Cash	$	107	$	185
Receivables:
Affiliates	1,304		2,656
Advances to affiliate	470,953		312,165
Trade and other	124,327		125,775
Transportation and exchange gas receivables	4,902		2,876
Inventories	47,469		45,918
Regulatory assets	30,998		36,706
Other	16,215		14,342
Total current assets	696,275		540,623
Investments, at cost plus equity in undistributed earnings	53,666		55,603
Property, Plant and Equipment:
Natural gas transmission plant	8,775,468		8,506,189
Less-Accumulated depreciation and amortization	3,051,284		2,954,276
Total property, plant and equipment, net	5,724,184		5,551,913
Other Assets:
Regulatory assets	275,581		214,912
Other	51,684		47,764
Total other assets	327,265		262,676
Total assets	$	6,801,390	$	6,410,815

(continued)

See accompanying notes.

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TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

CONDENSED CONSOLIDATED BALANCE SHEET

(Thousands of Dollars)

(Unaudited)

	September 30, 2013			December 31, 2012
LIABILITIES AND OWNER’S EQUITY
Current Liabilities:
Payables:
Affiliates	$	27,417		$	32,006
Trade and other	123,931			119,307
Transportation and exchange gas payables	1,646			3,513
Reserve for rate refunds	68,407			—
Accrued liabilities	152,865			139,333
Total current liabilities	374,266			294,159
Long-Term Debt	1,428,422			1,428,323
Other Long-Term Liabilities:
Asset retirement obligations	237,373			253,398
Regulatory liabilities	256,458			232,888
Other	19,616			5,339
Total other long-term liabilities	513,447			491,625
Contingent Liabilities and Commitments (Note 2)
Owner’s Equity:
Member’s capital	2,196,213			1,993,412
Retained earnings	2,289,360			2,204,018
Accumulated other comprehensive loss	(318		)	(722		)
Total owner’s equity	4,485,255			4,196,708
Total liabilities and owner’s equity	$	6,801,390		$	6,410,815

See accompanying notes.

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TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS

(Thousands of Dollars)

(Unaudited)

	Nine months ended September 30,
	2013			2012
Cash flows from operating activities:
Net income	$	271,342		$	183,426
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	197,112			199,451
Allowance for equity funds used during construction (equity AFUDC)	(10,959		)	(9,935		)
Changes in operating assets and liabilities:
Receivables — affiliates	1,352			3,370
— trade and other	1,448			13,093
Transportation and exchange gas receivable	(2,026		)	1,022
Inventories	295			1,199
Payables — affiliates	(4,589		)	13,078
— trade	(25,480		)	(14,067		)
Accrued liabilities	23,645			(1,930		)
Reserve for rate refunds	68,407			—
Asset retirement obligation removal costs	(24,619		)	(30,646		)
Other, net	66,741			25,722
Net cash provided by operating activities	562,669			383,783
Cash flows from financing activities:
Additions to long-term debt	—			398,804
Retirement of long-term debt	—			(325,000		)
Debt issue costs	—			(4,304		)
Cash distributions to parent	(186,000		)	(196,259		)
Cash contributions from parent	203,000			117,000
Other, net	9,143			(4,507		)
Net cash provided by (used in) financing activities	26,143			(14,266		)
Cash flows from investing activities:
Property, plant and equipment additions, net of equity AFUDC*	(418,565		)	(326,998		)
Disposal of property, plant and equipment, net	(1,786		)	9,920
Advances to affiliate, net	(158,788		)	(64,186		)
Return of capital from unconsolidated affiliates	916			11,327
Contributions to unconsolidated affiliates	—			(5,806		)
Purchase of ARO Trust investments	(44,975		)	(27,134		)
Proceeds from sale of ARO Trust investments	32,968			32,471
Other, net	1,340			825
Net cash used in investing activities	(588,890		)	(369,581		)
Increase (decrease) in cash	(78		)	(64		)
Cash at beginning of period	185			164
Cash at end of period	$	107		$	100
*       Increase to property, plant and equipment	$	(446,092	)	$	(327,634	)
Changes in related accounts payable and accrued liabilities	27,527			636
Property, plant and equipment additions, net of equity AFUDC	$	(418,565	)	$	(326,998	)

See accompanying notes.

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TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. BASIS OF PRESENTATION.

In this report, Transco (which includes Transcontinental Gas Pipe Line Company, LLC and unless the context otherwise requires, all of our majority-owned subsidiaries) is at times referred to in the first person as “we,” “us” or “our.”

Transco is owned, through Williams Partners Operating LLC (WPO), by Williams Partners L.P. (WPZ), a publicly traded Delaware limited partnership, which is consolidated by The Williams Companies, Inc. (Williams). At September 30, 2013, Williams holds an approximate 64 percent interest in WPZ, comprised of an approximate 62 percent limited partner interest and all of WPZ’s 2 percent general partner interest.

General.

The condensed consolidated unaudited financial statements include our accounts and the accounts of the subsidiaries we control. Companies in which we and our subsidiaries own 20 percent to 50 percent of the voting common stock or otherwise exercise significant influence over operating and financial policies of the company are accounted for under the equity method. The equity method investments as of September 30, 2013 and December 31, 2012 consist of Cardinal Pipeline Company, LLC (Cardinal) with ownership interest of approximately 45 percent and Pine Needle LNG Company, LLC (Pine Needle) with ownership interest of 35 percent. We received distributions associated with our equity method investments totaling $6.6 million and $13.3 million in the nine months ended September 30, 2013 and September 30, 2012, respectively. We made capital contributions to Cardinal related to Cardinal’s expansion project totaling $5.8 million in the nine months ended September 30, 2012. There were no contributions to Cardinal for the nine months ended September 30, 2013.

The condensed consolidated 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 U.S. generally accepted accounting principles (GAAP) have been condensed or omitted in this Form 10-Q pursuant to SEC rules and regulations. The condensed consolidated 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 consolidated unaudited financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2012 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 consolidated unaudited financial statements and accompanying notes. Actual results could differ from those estimates.

Certain prior period amounts reported within Total operating costs and expenses in the Condensed Consolidated Statement of Comprehensive Income have been reclassified to conform to the current presentation. The effect of the correction increased Operation and maintenance costs $1.5 million and $5.4 million for the three and nine months ended September 30, 2012, respectively, for the reclassification from Taxes — other than income, with no net impact on Total operating costs and expenses, Operating Income or Net Income.

Revenue subject to refund.

Federal Energy Regulatory Commission (FERC) regulations promulgate policies and procedures which govern a process to establish the rates that we are permitted to charge customers for natural gas sales and services, including the transportation and storage of natural gas. Key determinants in the ratemaking process are (1) costs of providing service, including depreciation expense, (2) allowed rate of return, including the equity component of the capital structure and related taxes, and (3) volume throughput assumptions.

As a result of the ratemaking process, certain revenues collected by us may be subject to refund upon the issuance of final orders by the FERC in pending rate proceedings. We record estimates of rate refund liabilities considering our

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and other third-party regulatory proceedings, advice of counsel and estimated total exposure, as discounted and risk weighted, as well as collection and other risks. Depending on the results of these proceedings, the actual amounts allowed to be collected from customers could differ from management’s estimate. In addition, as a result of rate orders, tariff provisions or regulations, we are required to refund or credit certain revenues to our customers. At September 30, 2013, we had accrued approximately $68.4 million for amounts that are probable of being refunded or credited.

2. CONTINGENT LIABILITIES AND COMMITMENTS.

Rate Matters.

General rate case (Docket No. RP12-993) On August 31, 2012, we submitted to the FERC a general rate filing principally designed to recover increased costs and to comply with the terms of the settlement in our Docket No. RP06-569 rate proceeding (see below) which required us to file a rate case no later than August 31, 2012. On September 28, 2012, the FERC issued an order accepting our filing subject to the outcome of a hearing. The rates for certain services that were proposed as overall rate decreases became effective October 1, 2012, without suspension. The increased rates became effective March 1, 2013, subject to refund and the outcome of a hearing. On August 27, 2013, after reaching an agreement in principle with the participants, we filed a stipulation and agreement that would resolve all issues in this proceeding without the need for a hearing. The stipulation and agreement is subject to review and approval by the FERC.  We have provided a reserve for rate refunds which we believe is adequate for any refunds that may be required.

General rate case (Docket No. RP06-569) On August 31, 2006, we submitted to the FERC a general rate filing principally designed to recover increased costs. The rates became effective March 1, 2007, subject to refund and the outcome of a hearing. All issues in this proceeding except one have been resolved by settlement.

The one issue reserved for litigation or further settlement relates to our proposal to change the design of the rates for service under one of our storage rate schedules, which was implemented subject to refund on March 1, 2007. A hearing on that issue was held before a FERC Administrative Law Judge (ALJ) in July 2008. In November 2008, the ALJ issued an initial decision in which he determined that our proposed incremental rate design is unjust and unreasonable. On January 21, 2010, the FERC reversed the ALJ’s initial decision, and approved our proposed incremental rate design. Certain parties sought rehearing of the FERC’s order and, on April 2, 2012, the FERC denied the rehearing request. On June 1, 2012, one of the parties filed an appeal in the U.S. Court of Appeals for the D.C. Circuit (D.C. Circuit). If the D.C. Circuit were to overturn the FERC’s order, we believe any refunds would not be material to our results of operations.

Environmental Matters.

We have had studies underway to test some of our facilities for the presence of toxic and hazardous substances to determine to what extent, if any, remediation may be necessary. We have responded to data requests from the U.S. Environmental Protection Agency (EPA) and state agencies regarding such potential contamination of certain of our sites. On the basis of the findings to date, we estimate that environmental assessment and remediation costs under various federal and state statutes will total approximately $5 million to $7 million (including both expense and capital expenditures), measured on an undiscounted basis, and will be spent over the next three to five years. This estimate depends on a number of assumptions concerning the scope of remediation that will be required at certain locations and the cost of the remedial measures. 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 September 30, 2013, we had a balance of approximately $4.0 million for the expense portion of these estimated costs recorded in current liabilities ($2.8 million) and other long-term liabilities ($1.2 million) in the accompanying Condensed Consolidated Balance Sheet. At December 31, 2012, we had a balance of approximately $3.3 million for the expense portion of these estimated costs recorded in current liabilities ($1.1 million) and other long-term liabilities ($2.2 million) in the accompanying Condensed Consolidated Balance Sheet.

Although we discontinued the use of lubricating oils containing polychlorinated biphenyls (PCBs) in the 1970s, we have discovered residual PCB contamination in equipment and soils at certain gas compressor station sites. We have worked closely with the EPA and state regulatory authorities regarding PCB issues, and we have a program to assess and remediate such conditions where they exist. In addition, we commenced negotiations with certain

8

environmental authorities and other parties concerning investigative and remedial actions relative to potential mercury contamination at certain gas metering sites. All such costs are included in the $5 million to $7 million range discussed above.

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 $5 million to $7 million range 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.

In March 2008, the EPA promulgated a new, lower National Ambient Air Quality Standard (NAAQS) for ground-level ozone. However, in September 2009, the EPA announced it would reconsider the 2008 NAAQS for ground level ozone to ensure that the standards were clearly grounded in science, and were protective of both public health and the environment. As a result, the EPA delayed designation of new eight-hour ozone non-attainment areas under the 2008 standards until the reconsideration was complete. In January 2010, the EPA proposed to further reduce the ground-level ozone NAAQS from the March 2008 levels. In September 2011, the EPA announced that it was proceeding with required actions to implement the 2008 ozone standard and area designations. In May 2012, the EPA completed designation of new eight-hour ozone non-attainment areas. Several Transco facilities are located in 2008 ozone non-attainment areas; however, each facility was previously subjected to federal and/or state emission control requirements implemented to address preceding ozone standards. To date, no new federal or state actions have been proposed to mandate additional emission controls at these facilities. At this time, it is unknown whether future federal or state regulatory actions associated with implementation of the 2008 ozone standard will impact our operations and increase the cost of additions to property, plant and equipment. Until any additional federal or state regulatory actions are proposed, we are unable to estimate the cost of additions that may be required to meet this new regulation.

Additionally, in August 2010, the EPA promulgated National Emission Standards for Hazardous Air Pollutants (NESHAP) regulations that will impact our operations. The remaining emission control additions required to comply with the hazardous air pollutant regulations are estimated to include capital costs of $1 million through 2013, the compliance date.

On January 22, 2010, the EPA set a new one-hour nitrogen dioxide (NO2) NAAQS. The effective date of the new NO2 standard was April 12, 2010. On January 20, 2012, the EPA determined pursuant to available information that no area in the country is violating the 2010 NO2 NAAQS and thus designated all areas of the country as “unclassifiable/attainment.” Also, at that time, the EPA noted its plan to deploy an expanded NO2 monitoring network beginning in 2013. However, on October 5, 2012, the EPA proposed a graduated implementation of the monitoring network between January 1, 2014 and January 1, 2017. Once three years of data is collected from the new monitoring network, the EPA will reassess attainment status with the one-hour NO2 NAAQS. Until that time, the EPA or states may require ambient air quality modeling on a case by case basis to demonstrate compliance with the NO2 standard. Because we are unable to predict the outcome of the EPA’s or states’ future assessment using the new monitoring network, we are unable to estimate the cost of additions that may be required to meet this regulation.

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. As a result, as estimated costs of environmental assessment and remediation are incurred, they are recorded as regulatory assets in the Condensed Consolidated Balance Sheet until collected through rates. We had a current regulatory asset of $0.7 million at September 30, 2013 for such deferred costs. We had no uncollected environmental related regulatory assets at December 31, 2012.

By letter dated September 20, 2007, the EPA required us to provide information regarding natural gas compressor stations in the states of Mississippi and Alabama as part of the EPA’s investigation of our compliance with the Federal Clean Air Act (Act). By January 2008, we responded with the requested information. By Notices of Violation (NOVs) dated March 28, 2008, the EPA found us to be in violation of the requirements of the Act with respect to these compressor

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stations. We met with the EPA in May 2008 to discuss the allegations contained in the NOVs; in June 2008, we submitted to the EPA a written response denying the allegations. The EPA has requested additional information pertaining to these compressor stations and in May 2011, we submitted information in response to the EPA’s latest request. In August, 2010, the EPA requested, and we provided, similar information for a compressor station in Maryland.

Other Matters.

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

Summary.

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. We have disclosed all significant matters for which we are unable to reasonably estimate a range of possible loss.

3. DEBT AND FINANCING ARRANGEMENTS.

Credit Facility.

On July 31, 2013, WPZ amended the $2.4 billion credit facility to increase the aggregate commitments to $2.5 billion and extend the maturity date to July 31, 2018. The amended credit facility may also, under certain conditions, be increased up to an additional $500 million. Total letter of credit capacity available to WPZ under the credit facility is $1.3 billion. At September 30, 2013, no letters of credit have been issued and no loans are outstanding under our credit facility. We may borrow up to $500 million under the amended credit facility to the extent not otherwise utilized by WPZ and Northwest Pipeline LLC. At September 30, 2013, the full $500 million under the credit facility was available to us.

WPZ participates in a commercial paper program and WPZ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. At September 30, 2013, WPZ had $371 million in outstanding commercial paper.

4. INVESTMENTS.

Available-for-Sale Investments.

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, the revenues specifically designated for ARO. We established the ARO trust account (ARO Trust) on June 30, 2008. The ARO Trust carries a moderate risk portfolio. We measure the financial instruments held in our ARO Trust at fair value. However, in accordance with the ASC Topic 980, Regulated Operations, both realized and unrealized gains and losses of the ARO Trust are recorded as regulatory assets or liabilities.

Effective March 1, 2013, based on the Docket No. RP12-993 rate filing, the annual funding obligation increased to approximately $50.4 million, with installments paid monthly. This amount is subject to change pursuant to the final resolution of the rate case.

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Investments in available-for-sale securities within the ARO Trust at fair value were as follows (in millions):

	September 30, 2013				December 31, 2012
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Cash and Money Market Funds	$	6.3	$	6.3	$	1.3	$	1.3
U.S. Equity Funds	8.1		10.1		5.4		7.4
International Equity Funds	4.2		4.7		3.4		3.8
Municipal Bond Funds	9.7		9.8		4.9		5.3
Total	$	28.3	$	30.9	$	15.0	$	17.8

5. FAIR VALUE MEASUREMENTS.

The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities.

							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 September 30, 2013:
Measured on a recurring basis:
ARO Trust investments	$	30.9		$	30.9		$	30.9	$	—		$	—
Additional disclosures:
Notes receivable	6.9			6.9			—		6.9			—
Long-term debt	(1,428.4		)	(1,530.9		)	—		(1,530.9		)	—
Assets (liabilities) at December 31, 2012:
Measured on a recurring basis:
ARO Trust investments	$	17.8		$	17.8		$	17.8	$	—		$	—
Additional disclosures:
Notes receivable	8.2			8.2			—		8.2			—
Long-term debt, including current portion	(1,428.3		)	(1,704.5		)	—		(1,704.5		)	—

Fair Value of 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:

Cash and short-term financial assets (advances to affiliate) that have variable interest rates — The carrying amount is a reasonable estimate of fair value due to the short maturity of those instruments.

ARO Trust investments — We deposit a portion of our collected rates, pursuant to the Docket No. RP06-569 rate case settlement, into the ARO Trust which is specifically designated to fund future asset retirement obligations. 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, are classified as available-for-sale, and are reported in Other Assets-Other in the Condensed Consolidated Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 4 for more information regarding the ARO Trust.

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Notes receivable — The disclosed fair value of our notes receivable is determined by an income approach which considers the underlying contract amounts and our assessment of our ability to recover these amounts. The current portion is reported in Trade and other receivables, and the noncurrent portion is reported in Other Assets-Other in the Condensed Consolidated Balance Sheet.

Long-term debt — The disclosed fair value of our long-term debt is determined 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.

Reclassifications of fair value between Level 1, Level 2, and Level 3 of the fair value hierarchy, if applicable, are made at the end of each quarter. No transfers between Level 1 and Level 2 occurred during the nine months ended September 30, 2013 or 2012.

6. TRANSACTIONS WITH AFFILIATES.

We are a participant in WPZ’s cash management program, and we make advances to and receive advances from WPZ. At September 30, 2013 and December 31, 2012, our advances to WPZ totaled approximately $471.0 million and $312.2 million, respectively. These advances are represented by demand notes and are classified as Current Assets in the accompanying Condensed Consolidated Balance Sheet. Advances are stated at the historical carrying amounts. Interest income is recognized when chargeable and collectability is reasonably assured. The interest rate on these intercompany demand notes is based upon the daily overnight investment rate paid on WPZ’s excess cash at the end of each month. At September 30, 2013, the interest rate was 0.01 percent.

Included in our Operating Revenues in the accompanying Condensed Consolidated Statement of Comprehensive Income are revenues received from affiliates of $1.6 million and $14.1 million for the three and nine months ended September 30, 2013, respectively, and $7.5 million and $8.6 million for the three and nine months ended September 30, 2012, 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 our Cost of natural gas sales in the accompanying Condensed Consolidated Statement of Comprehensive Income are cost of gas purchased from affiliates of $1.7 million and $5.7 million, for the three and nine months ended September 30, 2013, respectively, and $0.8 million and $3.2 million for the three and nine months ended September 30, 2012, 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 were billed $79.5 million and $233.0 million in the three and nine months ended September 30, 2013, respectively, and $81.2 million and $238.7 million in the three and nine months ended September 30, 2012, respectively, for these services. Such expenses are primarily included in Administrative and general and Operation and maintenance expenses in the accompanying Condensed Consolidated Statement of Comprehensive Income.

Pursuant to an operating agreement, we serve as the contract operator on certain Williams Field Services Company (WFS) facilities. We recorded reductions in operating expenses for services provided to and reimbursed by WFS of $0.6 million and $1.7 million for the three and nine months ended September 30, 2013, respectively, and $1.1 million and $2.7 million for the three and nine months ended September 30, 2012, respectively, under terms of the operating agreement.

We made equity distributions to WPO totaling $186.0 million and $196.3 million during the nine months ended September 30, 2013 and 2012, respectively. During October 2013, we made an additional distribution to WPO of $64.0 million. In the nine months ended September 30, 2013 and 2012, respectively, WPO made contributions to us totaling

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$203.0 million and $117.0 million to fund a portion of our expenditures for additions to property, plant and equipment. In October 2013, WPO made an additional $61.0 million contribution to us.

7. OTHER ACCRUALS.

Eminence Storage Field Abandonment — Due to the abandonment and retirement of four of the seven caverns at our Eminence Storage Field in 2013 and the expected recovery of such costs in our rates, we have reclassified $92 million of costs related to the Eminence ARO from Total property,plant andequipment, net to Regulatory assets (Eminence abandonment regulatory asset). Included in Other (income) expense, net, for the three and nine months ended September 30, 2013, consistent with the pending stipulation and agreement filed in our Docket No. RP12-993 general rate case proceeding, is a charge of $8.1 million and $14.5 million, respectively, related to the portion of the Eminence abandonment regulatory asset that will not be recovered in rates. We have also recognized income for the three and nine months ended September 30, 2013 of $3.3 million and $15.4 million, respectively, related to insurance recoveries associated with this event.

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 Consolidated Financial Statements, Notes and Management’s Discussion and Analysis contained in Items 7 and 8 of our 2012 Annual Report on Form 10-K and with the Condensed Consolidated Financial Statements and Notes contained in this Form 10-Q.

RESULTS OF OPERATIONS.

Operating Income and Net Income.

Operating income for the nine months ended September 30, 2013 was $309.7 million compared to $228.0 million for the nine months ended September 30, 2012. Net income for the nine months ended September 30, 2013 was $271.3 million compared to $183.4 million for the nine months ended September 30, 2012. The increase in Operating income of $81.7 million (35.8 percent) was primarily due to higher Natural gas transportation revenues in the first nine months of 2013 compared to the same period in 2012 and a decrease in Operating Costs and Expenses, as discussed below. The increase in Net income of $87.9 million (47.9 percent) was mostly attributable to the increase in Operating income and by a favorable change in net expenses in Other (Income) and Other Expenses, as discussed below.

Sales Revenues.

Operating revenues: Natural gas sales increased $51.2 million (139.5 percent) for the nine months ended September 30, 2013 compared to the same period in 2012. The increase was due to higher cash-out sales. Cash-out sales are offset in our cost of natural gas sold and therefore had no impact on our operating income or results of operations.

Transportation Revenues.

Operating revenues: Natural gas transportation for the nine months ended September 30, 2013 increased $46.3 million (6.1 percent) over the same period in 2012. The increase was partly due to the implementation of new rates in March 2013 which were higher as compared to the rates provided in the settlement of the prior rate proceeding. Also contributing to the positive variance were higher transportation reservation revenues related to new incremental projects of $40.3 million, ($27.4 million from our Mid-South project Phase 1 placed in service in September 2012 and Phase 2 placed in service in June 2013, $9.9 million from our Mid-Atlantic Connector project placed in service in January 2013 and $3.0 million from our Northeast Supply Link project placed in partial service in third quarter 2013), partially offset by $4.6 million lower recovery of electric power costs, $3.1 million lower transportation revenues due to a firm contract termination on the Mobile Bay lateral, and $2.2 million lower revenues due to one less billable day, as of result of leap year in 2012. Electric power costs are recovered from customers through transportation rates resulting in no net impact on our operating income or results of operations.

Operating Costs and Expenses.

Excluding the Cost of natural gas sales, which is directly offset in revenues, of $87.9 million for the nine months ended September 30, 2013 and $36.7 million for the comparable period in 2012, our operating costs and expenses for the nine months ended September 30, 2013 decreased approximately $33.3 million (5.2 percent) from the comparable period in 2012. This decrease was primarily attributable to:

• A $6.4 million (20.5 percent) favorable change in Other (income) expense, net primarily due to a $15.4 million gain recognized in 2013 related to insurance recoveries, offset by $14.5 million of expense in 2013 related to a charge for the regulatory asset that will not be recovered in rates, both associated with Eminence abandonment discussed below. Also contributing to the change was a decrease of $15.9 million of project feasibility costs, partially offset by a $9.8 million increase due to the amortization of regulatory assets resulting from ARO costs incurred prior to the Docket No. RP12-993 rate case;

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• A $25.5 million (11.6 percent) decrease in Operation and maintenance costs primarily resulting from a $10.2 million decrease in employee labor and related costs and a $15.3 million decrease primarily related to compressor and pipeline operation, maintenance and repairs;

• A $5.2 million (19.0 percent) decrease in Cost of natural gas transportation primarily resulting from lower electric power costs. Electric power costs are recovered from customers through transportation rates resulting in no net impact on our operating income or results of operations.

• Partially offset by a $4.6 million (3.5 percent) increase in Administrative and general costs primarily resulting from employee labor and related benefit costs.

Other (Income) and Other Expenses.

Other (income) and other expenses for the nine months ended September 30, 2013 had a favorable change of $6.1 million (13.7 percent) over the same period in 2012 primarily due to $5.8 million in lower interest expense due to the July 2012 refinancing of debt at lower interest rates.

Filing of Rate Case.

On August 31, 2012, we submitted to the FERC a general rate filing principally designed to recover increased costs and to comply with the terms of the settlement in our Docket No. RP06-569 rate proceeding which required us to file a rate case no later than August 31, 2012. On September 28, 2012, the FERC issued an order accepting our filing subject to the outcome of a hearing. The rates for certain services that were proposed as overall rate decreases became effective October 1, 2012, without suspension. The increased rates became effective March 1, 2013, subject to refund and the outcome of a hearing. On August 27, 2013, after reaching an agreement in principle with the participants, we filed a stipulation and agreement that would resolve all issues in this proceeding without the need for a hearing. The stipulation and agreement is subject to review and approval by the FERC.  We have provided a reserve for rate refunds which we believe is adequate for any refunds that may be required.

Eminence Storage Field Leak.

On December 28, 2010, we detected a leak in one of the seven underground natural gas storage caverns at our Eminence Storage Field in Covington County, Mississippi. We initially reduced the pressure in the cavern by safely venting and flaring gas, and began the process of flowing all remaining gas into our pipeline. Due to the leak at this cavern and damage to the well at an adjacent cavern, both caverns were taken out of service. In addition, two other caverns at the field, which were constructed at or about the same time as those caverns, experienced operating problems, and we determined that they should be retired. The event did not affect the performance of our obligations under our service agreements with our customers.

In September 2011 we filed an application with the FERC seeking authorization to abandon these four caverns. In February 2013, the FERC issued an order approving the abandonment. We estimate the cost to abandon the caverns, which will be capital in nature, will be approximately $103 million, which is expected to be spent through the first half of 2014. This estimate is subject to change as work progresses and additional information becomes known.

As of September 30, 2013, we have incurred approximately $91.6 million of these abandonment costs. Management considers these costs to be prudent costs incurred in the abandonment of these caverns. Consistent with the terms of the pending stipulation and agreement in the Docket No. RP12-993 rate case, for the three and nine months ended September 30, 2013, we expensed $8.1 million and $14.5 million, respectively, related to the Eminence abandonment regulatory asset that will not be recovered in rates.

We have reached settlement agreements with certain insurance counterparties related to this event. A portion of the proceeds from these settlements will be credited to the Eminence regulatory asset pursuant to the terms of the pending stipulation and agreement in the Docket No. RP12-993 rate case. The remaining balance of the proceeds are allocated to us to offset the expense associated with the write off of the uncollectible portion of the Eminence regulatory asset and a portion of our costs incurred to ensure the safety of the surrounding area. For the three and nine months

14

ended September 30, 2013, we have recognized $3.3 million and $15.4 million, respectively, related to these insurance recoveries.

During the three and nine months ended September 30, 2013, we incurred $1.0 million and $2.0 million, respectively, of expense, related primarily to costs to ensure the safety of the surrounding area. We anticipate incurring additional expense of approximately $4 million through the first half of 2014.

Capital Expenditures.

Our capital expenditures for the nine months ended September 30, 2013 were $418.6 million, compared to $327.0 million for the nine months ended September 30, 2012. The $91.6 million increase is primarily due to higher spending on expansion projects in 2013. Our capital expenditures estimate for 2013 and future capital projects are discussed in our 2012 Annual Report Form 10-K. The following describes those projects and certain new capital projects proposed by us.

Mid-South

The Mid-South Project involves an expansion of our mainline from Station 85 in Choctaw County, Alabama to markets as far downstream as North Carolina. In August 2011, we received approval from the FERC for the project. The capital cost of the project is estimated to be approximately $200 million. We placed the first phase of the project into service in September 2012 which increased capacity by 95 Mdth/d. We placed the second phase of the project into service in June 2013 which increased capacity by an additional 130 Mdth/d.

Mid-Atlantic Connector

The Mid-Atlantic Connector Project involves an expansion of our mainline from an existing interconnection with East Tennessee Natural Gas in North Carolina to markets as far downstream as Maryland. In July 2011, we received approval from the FERC for the project. The capital cost of the project is estimated to be approximately $60 million. We placed the project into service in the first quarter of 2013, and it increased capacity by 142 Mdth/d.

Northeast Supply Link

The Northeast Supply Link Project involves an expansion of our existing natural gas transmission system from the Marcellus Shale production region on the Leidy Line to various delivery points in Zone 6. In November 2012, we received approval from the FERC for the project. The capital cost of the project is estimated to be approximately $390 million. We placed a portion of the project into service in the third quarter 2013 increasing capacity by 125 Mdth/d. We plan to place the remaining portion into service in November 2013, and it will increase capacity by an additional 125 Mdth/d.

Rockaway Delivery Lateral

The Rockaway Delivery Lateral Project involves the construction of a three-mile offshore lateral to National Grid’s distribution system in New York. We filed an application with the FERC in January 2013 for approval of the project. The capital cost of the project is estimated to be approximately $230 million. We plan to place the project into service during the second half of 2014, and the capacity of the lateral will be 647 Mdth/d.

Northeast Connector Project

The Northeast Connector Project involves an expansion of our existing natural gas transmission system from southeastern Pennsylvania to the proposed Rockaway Delivery Lateral. We filed an application with the FERC in April 2013 for approval of the project. The capital cost of the project is estimated to be approximately $50 million. We plan to place the project into service during the second half of 2014, and it will increase capacity by 100 Mdth/d.

Virginia Southside

The Virginia Southside Project involves an expansion of our existing natural gas transmission system from the Zone 6 Station 210 Pooling Point in New Jersey to Dominion Virginia Power’s proposed power station in Brunswick

15

County, Virginia, and both our Cascade Creek interconnect with East Tennessee Natural Gas and our Pleasant Hill delivery point to Piedmont Natural Gas Company, Inc. in North Carolina. We filed an application with the FERC in December 2012 for approval of the project. The capital cost of the project is estimated to be approximately $300 million. We plan to place the project into service in September 2015, and it will increase capacity by 270 Mdth/d.

Leidy Southeast

The Leidy Southeast Project involves an expansion of our existing natural gas transmission system from the Marcellus Shale production region on the Leidy Line in Pennsylvania to the Station 85 pooling points in Alabama. We filed an application with the FERC in September 2013 for approval of the project. The capital cost of the project is estimated to be approximately $600 million. We plan to place the project into service in December 2015, and it will increase capacity by 525 Mdth/d.

Mobile Bay South III

The Mobile Bay South III Project involves an expansion of the Mobile Bay line south from Station 85 in west central Alabama to delivery points along the line. We filed an application with the FERC in July 2013 for approval of the project. The capital cost of the project is estimated to be approximately $50 million. We plan to place the project into service in April 2015, and it will increase capacity on the line by 225 Mdth/d.

Rock Springs Expansion

The Rock Springs Expansion Project involves an expansion of our existing natural gas transmission system southbound from the Zone 6 Station 210 Pooling Point in New Jersey along with a new eleven mile lateral to Old Dominion Electric Cooperative's proposed Wildcat Point generation facility near Rock Springs, Maryland. We plan to file an application with the FERC in the second quarter of 2014 for approval of the project. The capital cost of the project is estimated to be approximately $80 million. We plan to place the project into service in April 2016, and it will increase capacity by 192 Mdth/d.

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ITEM 4. Controls and Procedures.

Our management, including our Senior Vice President — Atlantic-Gulf 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) (Disclosure Controls) or our internal controls 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 — Atlantic-Gulf and our Vice President and Chief Accounting Officer. Based upon that evaluation, our Senior Vice President — Atlantic-Gulf and our Vice President and Chief Accounting Officer concluded that these Disclosure Controls are effective at a reasonable assurance level.

Third Quarter 2013 Changes in Internal Controls

There have been no changes during the third quarter of 2013 that have materially affected, or are reasonably likely to materially affect, our Internal Controls.

PART II — OTHER INFORMATION.

ITEM 1. Legal Proceedings.

The information called for by this item is provided in Note 2 of the Notes to Condensed Consolidated Financial Statements included under Part I, Item 1. Financial Statements of this report, which information is incorporated by reference into this item.

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ITEM 6. Exhibits.

The following instruments are included as exhibits to this report.

Exhibit Number	Description
2.1	Certificate of Conversion dated December 22, 2008 and effective December 31, 2008. (filed on February 24, 2011 as Exhibit 2.1 to our report Form 10-K 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 report Form 10-K 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 report Form 10-Q and incorporated herein by reference).
10	First Amended & Restated Credit Agreement, dated as of July 31, 2013, by and among Williams Partners L.P., Northwest Pipeline LLC and Transcontinental Gas Pipe Line Company, LLC, as co-borrowers, the lenders named therein, and Citibank N.A., as Administrative Agent (filed on July 31, 2013 as Exhibit 10 to Williams Partners L.P.’s Quarterly Report on Form 10-Q 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.
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.

*	Filed herewith.
**	Furnished herewith.

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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:	October 31, 2013	By:	/s/ Jeffrey P. Heinrichs
			Jeffrey P. Heinrichs
			Controller (Principal Accounting Officer)

EXHIBIT INDEX.

Exhibit Number	Description
2.1	Certificate of Conversion dated December 22, 2008 and effective December 31, 2008. (filed on February 24, 2011 as Exhibit 2.1 to our report Form 10-K 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 report Form 10-K 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 report Form 10-Q and incorporated herein by reference).
10	First Amended & Restated Credit Agreement, dated as of July 31, 2013, by and among Williams Partners L.P., Northwest Pipeline LLC and Transcontinental Gas Pipe Line Company, LLC, as co-borrowers, the lenders named therein, and Citibank N.A., as Administrative Agent (filed on July 31, 2013 as Exhibit 10 to Williams Partners L.P.’s Quarterly Report on Form 10-Q 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.
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.

*	Filed herewith.
**	Furnished herewith.

EX-31.1

Exhibit 31.1

SECTION 302 CERTIFICATION

I, Rory L. Miller, 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: October 31, 2013

By:	/s/ Rory L. Miller
	Rory L. Miller
	Senior Vice President — Atlantic-Gulf
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

SECTION 302 CERTIFICATION

I, Ted T. Timmermans, 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: October 31, 2013

By:	/s/ Ted T. Timmermans
	Ted T. Timmermans
	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 September 30, 2013 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/ Rory L. Miller

Rory L. Miller

Senior Vice President — Atlantic-Gulf

October 31, 2013

/s/ Ted T. Timmermans

Ted T. Timmermans

Vice President and Chief Accounting Officer

October 31, 2013

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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Debt and Financing Arrangements (Details Textual) (USD $)	Sep. 30, 2013	Jul. 31, 2013
Williams Partners L.P. [Member]
Line of Credit Facility [Line Items]
Commercial Paper	$ 371,000,000
$2.4 billion credit facility [Member] | Williams Partners L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,400,000,000
$2.5 billion credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		500,000,000
Letters of Credit Outstanding, Amount	0
Line of Credit Facility, Amount Outstanding	0
Line of Credit Facility, Remaining Borrowing Capacity	500,000,000
$2.5 billion credit facility [Member] | Williams Partners L.P. [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,500,000,000
Additional amount credit facility can be increased		500,000,000
$2.5 billion credit facility [Member] | Williams Partners L.P. [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,300,000,000

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Condensed Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash	$ 107	$ 185
Receivables:
Affiliates	1,304	2,656
Advances to affiliate	470,953	312,165
Trade and other	124,327	125,775
Transportation and exchange gas receivables	4,902	2,876
Inventories	47,469	45,918
Regulatory assets	30,998	36,706
Other	16,215	14,342
Total current assets	696,275	540,623
Investments, at cost plus equity in undistributed earnings	53,666	55,603
Property, Plant and Equipment:
Natural gas transmission plant	8,775,468	8,506,189
Less-Accumulated depreciation and amortization	3,051,284	2,954,276
Total property, plant and equipment, net	5,724,184	5,551,913
Other Assets:
Regulatory assets	275,581	214,912
Other	51,684	47,764
Total other assets	327,265	262,676
Total assets	6,801,390	6,410,815
Payables:
Affiliates	27,417	32,006
Trade and other	123,931	119,307
Transportation and exchange gas payables	1,646	3,513
Reserve for rate refunds	68,407	0
Accrued liabilities	152,865	139,333
Total current liabilities	374,266	294,159
Long-Term Debt	1,428,422	1,428,323
Other Long-Term Liabilities:
Asset retirement obligations	237,373	253,398
Regulatory liabilities	256,458	232,888
Other	19,616	5,339
Total other long-term liabilities	513,447	491,625
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	2,196,213	1,993,412
Retained earnings	2,289,360	2,204,018
Accumulated other comprehensive loss	(318)	(722)
Total owner's equity	4,485,255	4,196,708
Total liabilities and owner's equity	$ 6,801,390	$ 6,410,815

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Fair Value Measurements

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS.

The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities.

							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 September 30, 2013:
Measured on a recurring basis:
ARO Trust investments	$	30.9		$	30.9		$	30.9	$	—		$	—
Additional disclosures:
Notes receivable	6.9			6.9			—		6.9			—
Long-term debt	(1,428.4		)	(1,530.9		)	—		(1,530.9		)	—
Assets (liabilities) at December 31, 2012:
Measured on a recurring basis:
ARO Trust investments	$	17.8		$	17.8		$	17.8	$	—		$	—
Additional disclosures:
Notes receivable	8.2			8.2			—		8.2			—
Long-term debt, including current portion	(1,428.3		)	(1,704.5		)	—		(1,704.5		)	—

Fair Value of 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:

Cash and short-term financial assets (advances to affiliate) that have variable interest rates — The carrying amount is a reasonable estimate of fair value due to the short maturity of those instruments.

ARO Trust investments — We deposit a portion of our collected rates, pursuant to the Docket No. RP06-569 rate case settlement, into the ARO Trust which is specifically designated to fund future asset retirement obligations. 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, are classified as available-for-sale, and are reported in Other Assets-Other in the Condensed Consolidated Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 4 for more information regarding the ARO Trust.

Notes receivable — The disclosed fair value of our notes receivable is determined by an income approach which considers the underlying contract amounts and our assessment of our ability to recover these amounts. The current portion is reported in Trade and other receivables, and the noncurrent portion is reported in Other Assets-Other in the Condensed Consolidated Balance Sheet.

Long-term debt — The disclosed fair value of our long-term debt is determined 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.

Reclassifications of fair value between Level 1, Level 2, and Level 3 of the fair value hierarchy, if applicable, are made at the end of each quarter. No transfers between Level 1 and Level 2 occurred during the nine months ended September 30, 2013 or 2012.

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Investments (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Mar. 01, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Annual Funding Obligation		$ 50.4
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	28.3		15.0
Available-for-sale Securities, Fair Value Disclosure	30.9		17.8
Cash And Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6.3		1.3
Available-for-sale Securities, Fair Value Disclosure	6.3		1.3
U.S. Equity Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8.1		5.4
Available-for-sale Securities, Fair Value Disclosure	10.1		7.4
International Equity Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4.2		3.4
Available-for-sale Securities, Fair Value Disclosure	4.7		3.8
Municipal Bond Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9.7		4.9
Available-for-sale Securities, Fair Value Disclosure	$ 9.8		$ 5.3

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Basis of Presentation

9 Months Ended

Sep. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION.

In this report, Transco (which includes Transcontinental Gas Pipe Line Company, LLC and unless the context otherwise requires, all of our majority-owned subsidiaries) is at times referred to in the first person as “we,” “us” or “our.”

Transco is owned, through Williams Partners Operating LLC (WPO), by Williams Partners L.P. (WPZ), a publicly traded Delaware limited partnership, which is consolidated by The Williams Companies, Inc. (Williams). At September 30, 2013, Williams holds an approximate 64 percent interest in WPZ, comprised of an approximate 62 percent limited partner interest and all of WPZ’s 2 percent general partner interest.

General.

The condensed consolidated unaudited financial statements include our accounts and the accounts of the subsidiaries we control. Companies in which we and our subsidiaries own 20 percent to 50 percent of the voting common stock or otherwise exercise significant influence over operating and financial policies of the company are accounted for under the equity method. The equity method investments as of September 30, 2013 and December 31, 2012 consist of Cardinal Pipeline Company, LLC (Cardinal) with ownership interest of approximately 45 percent and Pine Needle LNG Company, LLC (Pine Needle) with ownership interest of 35 percent. We received distributions associated with our equity method investments totaling $6.6 million and $13.3 million in the nine months ended September 30, 2013 and September 30, 2012, respectively. We made capital contributions to Cardinal related to Cardinal’s expansion project totaling $5.8 million in the nine months ended September 30, 2012. There were no contributions to Cardinal for the nine months ended September 30, 2013.

The condensed consolidated 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 U.S. generally accepted accounting principles (GAAP) have been condensed or omitted in this Form 10-Q pursuant to SEC rules and regulations. The condensed consolidated 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 consolidated unaudited financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2012 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 consolidated unaudited financial statements and accompanying notes. Actual results could differ from those estimates.

Certain prior period amounts reported within Total operating costs and expenses in the Condensed Consolidated Statement of Comprehensive Income have been reclassified to conform to the current presentation. The effect of the correction increased Operation and maintenance costs $1.5 million and $5.4 million for the three and nine months ended September 30, 2012, respectively, for the reclassification from Taxes — other than income, with no net impact on Total operating costs and expenses, Operating Income or Net Income.

Revenue subject to refund.

Federal Energy Regulatory Commission (FERC) regulations promulgate policies and procedures which govern a process to establish the rates that we are permitted to charge customers for natural gas sales and services, including the transportation and storage of natural gas. Key determinants in the ratemaking process are (1) costs of providing service, including depreciation expense, (2) allowed rate of return, including the equity component of the capital structure and related taxes, and (3) volume throughput assumptions.

As a result of the ratemaking process, certain revenues collected by us may be subject to refund upon the issuance of final orders by the FERC in pending rate proceedings. We record estimates of rate refund liabilities considering our and other third-party regulatory proceedings, advice of counsel and estimated total exposure, as discounted and risk weighted, as well as collection and other risks. Depending on the results of these proceedings, the actual amounts allowed to be collected from customers could differ from management’s estimate. In addition, as a result of rate orders, tariff provisions or regulations, we are required to refund or credit certain revenues to our customers. At September 30, 2013, we had accrued approximately $68.4 million for amounts that are probable of being refunded or credited.

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Debt and Financing Arrangements

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

DEBT AND FINANCING ARRANGEMENTS

DEBT AND FINANCING ARRANGEMENTS.

Credit Facility.

On July 31, 2013, WPZ amended the $2.4 billion credit facility to increase the aggregate commitments to $2.5 billion and extend the maturity date to July 31, 2018. The amended credit facility may also, under certain conditions, be increased up to an additional $500 million. Total letter of credit capacity available to WPZ under the credit facility is $1.3 billion. At September 30, 2013, no letters of credit have been issued and no loans are outstanding under our credit facility. We may borrow up to $500 million under the amended credit facility to the extent not otherwise utilized by WPZ and Northwest Pipeline LLC. At September 30, 2013, the full $500 million under the credit facility was available to us.

WPZ participates in a commercial paper program and WPZ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. At September 30, 2013, WPZ had $371 million in outstanding commercial paper.

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Transactions with Affiliates

9 Months Ended

Sep. 30, 2013

Related Party Transactions [Abstract]

TRANSACTIONS WITH AFFLIATES

TRANSACTIONS WITH AFFILIATES.

We are a participant in WPZ’s cash management program, and we make advances to and receive advances from WPZ. At September 30, 2013 and December 31, 2012, our advances to WPZ totaled approximately $471.0 million and $312.2 million, respectively. These advances are represented by demand notes and are classified as Current Assets in the accompanying Condensed Consolidated Balance Sheet. Advances are stated at the historical carrying amounts. Interest income is recognized when chargeable and collectability is reasonably assured. The interest rate on these intercompany demand notes is based upon the daily overnight investment rate paid on WPZ’s excess cash at the end of each month. At September 30, 2013, the interest rate was 0.01 percent.

Included in our Operating Revenues in the accompanying Condensed Consolidated Statement of Comprehensive Income are revenues received from affiliates of $1.6 million and $14.1 million for the three and nine months ended September 30, 2013, respectively, and $7.5 million and $8.6 million for the three and nine months ended September 30, 2012, 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 our Cost of natural gas sales in the accompanying Condensed Consolidated Statement of Comprehensive Income are cost of gas purchased from affiliates of $1.7 million and $5.7 million, for the three and nine months ended September 30, 2013, respectively, and $0.8 million and $3.2 million for the three and nine months ended September 30, 2012, 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 were billed $79.5 million and $233.0 million in the three and nine months ended September 30, 2013, respectively, and $81.2 million and $238.7 million in the three and nine months ended September 30, 2012, respectively, for these services. Such expenses are primarily included in Administrative and general and Operation and maintenance expenses in the accompanying Condensed Consolidated Statement of Comprehensive Income.

Pursuant to an operating agreement, we serve as the contract operator on certain Williams Field Services Company (WFS) facilities. We recorded reductions in operating expenses for services provided to and reimbursed by WFS of $0.6 million and $1.7 million for the three and nine months ended September 30, 2013, respectively, and $1.1 million and $2.7 million for the three and nine months ended September 30, 2012, respectively, under terms of the operating agreement.

We made equity distributions to WPO totaling $186.0 million and $196.3 million during the nine months ended September 30, 2013 and 2012, respectively. During October 2013, we made an additional distribution to WPO of $64.0 million. In the nine months ended September 30, 2013 and 2012, respectively, WPO made contributions to us totaling $203.0 million and $117.0 million to fund a portion of our expenditures for additions to property, plant and equipment. In October 2013, WPO made an additional $61.0 million contribution to us.

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Investments

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

INVESTMENTS.

Available-for-Sale Investments.

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, the revenues specifically designated for ARO. We established the ARO trust account (ARO Trust) on June 30, 2008. The ARO Trust carries a moderate risk portfolio. We measure the financial instruments held in our ARO Trust at fair value. However, in accordance with the ASC Topic 980, Regulated Operations, both realized and unrealized gains and losses of the ARO Trust are recorded as regulatory assets or liabilities.

Effective March 1, 2013, based on the Docket No. RP12-993 rate filing, the annual funding obligation increased to approximately $50.4 million, with installments paid monthly. This amount is subject to change pursuant to the final resolution of the rate case.

Investments in available-for-sale securities within the ARO Trust at fair value were as follows (in millions):

	September 30, 2013				December 31, 2012
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Cash and Money Market Funds	$	6.3	$	6.3	$	1.3	$	1.3
U.S. Equity Funds	8.1		10.1		5.4		7.4
International Equity Funds	4.2		4.7		3.4		3.8
Municipal Bond Funds	9.7		9.8		4.9		5.3
Total	$	28.3	$	30.9	$	15.0	$	17.8

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Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Accumulated other comprehensive income reclassification for realized losses on interest rate hedges	$ 83	$ 68	$ 244	$ 145

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities.

							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 September 30, 2013:
Measured on a recurring basis:
ARO Trust investments	$	30.9		$	30.9		$	30.9	$	—		$	—
Additional disclosures:
Notes receivable	6.9			6.9			—		6.9			—
Long-term debt	(1,428.4		)	(1,530.9		)	—		(1,530.9		)	—
Assets (liabilities) at December 31, 2012:
Measured on a recurring basis:
ARO Trust investments	$	17.8		$	17.8		$	17.8	$	—		$	—
Additional disclosures:
Notes receivable	8.2			8.2			—		8.2			—
Long-term debt, including current portion	(1,428.3		)	(1,704.5		)	—		(1,704.5		)	—

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Condensed Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 271,342	$ 183,426
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	197,112	199,451
Allowance for equity funds used during construction (equity AFUDC)	(10,959)	(9,935)
Changes in operating assets and liabilities:
Receivables - affiliates	1,352	3,370
Receivables - trade and other	1,448	13,093
Transportation and exchange gas receivable	(2,026)	1,022
Inventories	295	1,199
Payables - affiliates	(4,589)	13,078
Payables - trade	(25,480)	(14,067)
Accrued liabilities	23,645	(1,930)
Reserve for rate refunds	68,407	0
Asset retirement obligation removal costs	(24,619)	(30,646)
Other, net	66,741	25,722
Net cash provided by operating activities	562,669	383,783
Cash flows from financing activities:
Additions to long-term debt	0	398,804
Retirement of long-term debt	0	(325,000)
Debt issue costs	0	(4,304)
Cash distributions to parent	(186,000)	(196,259)
Cash contributions from parent	203,000	117,000
Other, net	9,143	(4,507)
Net cash provided by (used in) financing activities	26,143	(14,266)
Cash flows from investing activities:
Property, plant and equipment additions, net of equity AFUDC	(418,565)	(326,998)
Disposal of property, plant and equipment, net	(1,786)	9,920
Advances to affiliate, net	(158,788)	(64,186)
Return of capital from unconsolidated affiliates	916	11,327
Contributions to unconsolidated affiliates	0	(5,806)
Purchase of ARO Trust investments	(44,975)	(27,134)
Proceeds from sale of ARO Trust investments	32,968	32,471
Other, net	1,340	825
Net cash used in investing activities	(588,890)	(369,581)
Increase (decrease) in cash	(78)	(64)
Cash at beginning of period	185	164
Cash at end of period	107	100
Increase to property, plant and equipment	(446,092)	(327,634)
Changes in related accounts payable and accrued liabilities	27,527	636
Property, plant and equipment additions, net of equity AFUDC	$ (418,565)	$ (326,998)

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Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenues:
Natural gas sales	$ 27,282	$ 15,828	$ 87,866	$ 36,691
Natural gas transportation	268,426	251,691	808,002	761,659
Natural gas storage	35,736	34,714	107,243	105,171
Other	811	724	3,085	3,079
Total operating revenues	332,255	302,957	1,006,196	906,600
Operating Costs and Expenses:
Cost of natural gas sales	27,282	15,828	87,866	36,691
Cost of natural gas transportation	3,056	8,104	22,053	27,264
Operation and maintenance	70,294	79,991	194,008	219,518
Administrative and general	43,747	42,443	135,767	131,225
Depreciation and amortization	66,989	66,693	198,148	199,068
Taxes - other than income taxes	11,318	11,133	33,879	33,660
Other (income) expense, net	12,562	7,753	24,750	31,214
Total operating costs and expenses	235,248	231,945	696,471	678,640
Operating Income	97,007	71,012	309,725	227,960
Other (Income) and Other Expenses:
Interest expense	21,416	21,132	62,716	68,518
Allowance for equity and borrowed funds used during construction (AFUDC)	(5,002)	(5,886)	(15,352)	(14,468)
Equity in earnings of unconsolidated affiliates	(1,493)	(2,127)	(4,234)	(5,395)
Miscellaneous other (income) expenses, net	(1,632)	(2,069)	(4,747)	(4,121)
Total other (income) and other expenses	13,289	11,050	38,383	44,534
Net Income	83,718	59,962	271,342	183,426
Equity interest in unrealized gain (loss) on interest rate hedges (includes $83 and $68 for the three months ended and $244 and $145 for the nine months ended September 30, 2013 and September 30, 2012, respectively, of accumulated other comprehensive income reclassification for realized losses on interest rate hedges)	(102)	(283)	404	(441)
Comprehensive Income	$ 83,616	$ 59,679	$ 271,746	$ 182,985

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Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

Investments in available-for-sale securities within the ARO Trust at fair value were as follows (in millions):

	September 30, 2013				December 31, 2012
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
Cash and Money Market Funds	$	6.3	$	6.3	$	1.3	$	1.3
U.S. Equity Funds	8.1		10.1		5.4		7.4
International Equity Funds	4.2		4.7		3.4		3.8
Municipal Bond Funds	9.7		9.8		4.9		5.3
Total	$	28.3	$	30.9	$	15.0	$	17.8

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Contingent Liabilities and Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Environmental Matters [Abstract]
Aggregate, Loss Exposure Not Accrued, Low Estimate	$ 5
Aggregate, Loss Exposure Not Accrued, High Estimate	7.0
Accrual for Environmental Loss Contingencies, Total	4.0	3.3
Accrued Environmental Loss Contingencies, Current	2.8	1.1
Accrued Environmental Loss Contingencies, Noncurrent	1.2	2.2
Estimated Capital Costs For Compliance With Hazardous Air Pollutant Regulations	1
Potentially Responsible Party At Various Superfund And State Waste Disposal Sites [Member]
Environmental Matters [Abstract]
Aggregate, Loss Exposure Not Accrued, High Estimate	0.5
Environmental Restoration Costs [Member]
Environmental Matters [Abstract]
Regulatory Assets	$ 0.7	$ 0
Minimum [Member]
Environmental Matters [Abstract]
Expected Duration Of Environmental Assessment And Remediation Spending	3 years
Maximum [Member]
Environmental Matters [Abstract]
Expected Duration Of Environmental Assessment And Remediation Spending	5 years

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Other Accruals

9 Months Ended

Sep. 30, 2013

Other Income and Expenses [Abstract]

Other Accruals

OTHER ACCRUALS.

Eminence Storage Field Abandonment — Due to the abandonment and retirement of four of the seven caverns at our Eminence Storage Field in 2013 and the expected recovery of such costs in our rates, we have reclassified $92 million of costs related to the Eminence ARO from Total property,plant andequipment, net to Regulatory assets (Eminence abandonment regulatory asset). Included in Other (income) expense, net, for the three and nine months ended September 30, 2013, consistent with the pending stipulation and agreement filed in our Docket No. RP12-993 general rate case proceeding, is a charge of $8.1 million and $14.5 million, respectively, related to the portion of the Eminence abandonment regulatory asset that will not be recovered in rates. We have also recognized income for the three and nine months ended September 30, 2013 of $3.3 million and $15.4 million, respectively, related to insurance recoveries associated with this event.

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Contingent Liabilities and Commitments

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

CONTINGENT LIABILITIES AND COMMITMENTS

CONTINGENT LIABILITIES AND COMMITMENTS.

Rate Matters.

General rate case (Docket No. RP12-993) On August 31, 2012, we submitted to the FERC a general rate filing principally designed to recover increased costs and to comply with the terms of the settlement in our Docket No. RP06-569 rate proceeding (see below) which required us to file a rate case no later than August 31, 2012. On September 28, 2012, the FERC issued an order accepting our filing subject to the outcome of a hearing. The rates for certain services that were proposed as overall rate decreases became effective October 1, 2012, without suspension. The increased rates became effective March 1, 2013, subject to refund and the outcome of a hearing. On August 27, 2013, after reaching an agreement in principle with the participants, we filed a stipulation and agreement that would resolve all issues in this proceeding without the need for a hearing. The stipulation and agreement is subject to review and approval by the FERC.  We have provided a reserve for rate refunds which we believe is adequate for any refunds that may be required.

General rate case (Docket No. RP06-569) On August 31, 2006, we submitted to the FERC a general rate filing principally designed to recover increased costs. The rates became effective March 1, 2007, subject to refund and the outcome of a hearing. All issues in this proceeding except one have been resolved by settlement.

The one issue reserved for litigation or further settlement relates to our proposal to change the design of the rates for service under one of our storage rate schedules, which was implemented subject to refund on March 1, 2007. A hearing on that issue was held before a FERC Administrative Law Judge (ALJ) in July 2008. In November 2008, the ALJ issued an initial decision in which he determined that our proposed incremental rate design is unjust and unreasonable. On January 21, 2010, the FERC reversed the ALJ’s initial decision, and approved our proposed incremental rate design. Certain parties sought rehearing of the FERC’s order and, on April 2, 2012, the FERC denied the rehearing request. On June 1, 2012, one of the parties filed an appeal in the U.S. Court of Appeals for the D.C. Circuit (D.C. Circuit). If the D.C. Circuit were to overturn the FERC’s order, we believe any refunds would not be material to our results of operations.

Environmental Matters.

We have had studies underway to test some of our facilities for the presence of toxic and hazardous substances to determine to what extent, if any, remediation may be necessary. We have responded to data requests from the U.S. Environmental Protection Agency (EPA) and state agencies regarding such potential contamination of certain of our sites. On the basis of the findings to date, we estimate that environmental assessment and remediation costs under various federal and state statutes will total approximately $5 million to $7 million (including both expense and capital expenditures), measured on an undiscounted basis, and will be spent over the next three to five years. This estimate depends on a number of assumptions concerning the scope of remediation that will be required at certain locations and the cost of the remedial measures. 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 September 30, 2013, we had a balance of approximately $4.0 million for the expense portion of these estimated costs recorded in current liabilities ($2.8 million) and other long-term liabilities ($1.2 million) in the accompanying Condensed Consolidated Balance Sheet. At December 31, 2012, we had a balance of approximately $3.3 million for the expense portion of these estimated costs recorded in current liabilities ($1.1 million) and other long-term liabilities ($2.2 million) in the accompanying Condensed Consolidated Balance Sheet.

Although we discontinued the use of lubricating oils containing polychlorinated biphenyls (PCBs) in the 1970s, we have discovered residual PCB contamination in equipment and soils at certain gas compressor station sites. We have worked closely with the EPA and state regulatory authorities regarding PCB issues, and we have a program to assess and remediate such conditions where they exist. In addition, we commenced negotiations with certain environmental authorities and other parties concerning investigative and remedial actions relative to potential mercury contamination at certain gas metering sites. All such costs are included in the $5 million to $7 million range discussed above.

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 $5 million to $7 million range 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.

In March 2008, the EPA promulgated a new, lower National Ambient Air Quality Standard (NAAQS) for ground-level ozone. However, in September 2009, the EPA announced it would reconsider the 2008 NAAQS for ground level ozone to ensure that the standards were clearly grounded in science, and were protective of both public health and the environment. As a result, the EPA delayed designation of new eight-hour ozone non-attainment areas under the 2008 standards until the reconsideration was complete. In January 2010, the EPA proposed to further reduce the ground-level ozone NAAQS from the March 2008 levels. In September 2011, the EPA announced that it was proceeding with required actions to implement the 2008 ozone standard and area designations. In May 2012, the EPA completed designation of new eight-hour ozone non-attainment areas. Several Transco facilities are located in 2008 ozone non-attainment areas; however, each facility was previously subjected to federal and/or state emission control requirements implemented to address preceding ozone standards. To date, no new federal or state actions have been proposed to mandate additional emission controls at these facilities. At this time, it is unknown whether future federal or state regulatory actions associated with implementation of the 2008 ozone standard will impact our operations and increase the cost of additions to property, plant and equipment. Until any additional federal or state regulatory actions are proposed, we are unable to estimate the cost of additions that may be required to meet this new regulation.

Additionally, in August 2010, the EPA promulgated National Emission Standards for Hazardous Air Pollutants (NESHAP) regulations that will impact our operations. The remaining emission control additions required to comply with the hazardous air pollutant regulations are estimated to include capital costs of $1 million through 2013, the compliance date.

On January 22, 2010, the EPA set a new one-hour nitrogen dioxide (NO2) NAAQS. The effective date of the new NO2 standard was April 12, 2010. On January 20, 2012, the EPA determined pursuant to available information that no area in the country is violating the 2010 NO2 NAAQS and thus designated all areas of the country as “unclassifiable/attainment.” Also, at that time, the EPA noted its plan to deploy an expanded NO2 monitoring network beginning in 2013. However, on October 5, 2012, the EPA proposed a graduated implementation of the monitoring network between January 1, 2014 and January 1, 2017. Once three years of data is collected from the new monitoring network, the EPA will reassess attainment status with the one-hour NO2 NAAQS. Until that time, the EPA or states may require ambient air quality modeling on a case by case basis to demonstrate compliance with the NO2 standard. Because we are unable to predict the outcome of the EPA’s or states’ future assessment using the new monitoring network, we are unable to estimate the cost of additions that may be required to meet this regulation.

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. As a result, as estimated costs of environmental assessment and remediation are incurred, they are recorded as regulatory assets in the Condensed Consolidated Balance Sheet until collected through rates. We had a current regulatory asset of $0.7 million at September 30, 2013 for such deferred costs. We had no uncollected environmental related regulatory assets at December 31, 2012.

By letter dated September 20, 2007, the EPA required us to provide information regarding natural gas compressor stations in the states of Mississippi and Alabama as part of the EPA’s investigation of our compliance with the Federal Clean Air Act (Act). By January 2008, we responded with the requested information. By Notices of Violation (NOVs) dated March 28, 2008, the EPA found us to be in violation of the requirements of the Act with respect to these compressor stations. We met with the EPA in May 2008 to discuss the allegations contained in the NOVs; in June 2008, we submitted to the EPA a written response denying the allegations. The EPA has requested additional information pertaining to these compressor stations and in May 2011, we submitted information in response to the EPA’s latest request. In August, 2010, the EPA requested, and we provided, similar information for a compressor station in Maryland.

Other Matters.

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

Summary.

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. We have disclosed all significant matters for which we are unable to reasonably estimate a range of possible loss.

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Fair Value Measurements (Details Textual) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Fair Value Disclosures [Abstract]
FairValueAssetsLevel1ToLevel2TransfersAmount	$ 0	$ 0
FairValueAssetsLevel2ToLevel1TransfersAmount	0	0
FairValueLiabilitiesLevel1ToLevel2TransfersAmount	0	0
FairValueLiabilitiesLevel2ToLevel1TransfersAmount	$ 0	$ 0

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Basis of Presentation (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Parent, total ownership percentage		64.00%
Parent, limited partner ownership percentage		62.00%
Parent, general partner ownership percentage		2.00%
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions		$ 6,600,000	$ 13,300,000
Contributions to unconsolidated affiliates		0	(5,806,000)
Prior Period
Prior Period Reclassification Adjustment	1,500,000		5,400,000
Revenue subject to refund [Abstract]
Reserve for rate refunds		68,407,000		0
Cardinal Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		45.00%
Contributions to unconsolidated affiliates		$ 0	$ (5,800,000)
Pine Needle LNG Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		35.00%

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Other Accruals (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Component of Operating Other Cost and Expense [Line Items]
Regulatory assets	$ 275,581,000		$ 275,581,000		$ 214,912,000
Other (income) expense, net	12,562,000	7,753,000	24,750,000	31,214,000
Eminence Storage Field Abandonment [Member]
Component of Operating Other Cost and Expense [Line Items]
Regulatory assets	92,000,000		92,000,000
Other (income) expense, net	(8,100,000)		(14,500,000)
Insurance Recoveries	$ 3,300,000		$ 15,400,000

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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Recurring basis [Abstract]
ARO Trust investments	$ 30.9	$ 17.8
Level 1 [Member]
Additional disclosures [Abstract]
Notes receivables	0	0
Long-term debt	0	0
Level 2 [Member]
Additional disclosures [Abstract]
Notes receivables	6.9	8.2
Long-term debt	(1,530.9)	(1,704.5)
Level 3 [Member]
Additional disclosures [Abstract]
Notes receivables	0	0
Long-term debt	0	0
Carrying Amount [Member]
Additional disclosures [Abstract]
Notes receivables	6.9	8.2
Long-term debt	(1,428.4)	(1,428.3)
Fair Value [Member]
Additional disclosures [Abstract]
Notes receivables	6.9	8.2
Long-term debt	(1,530.9)	(1,704.5)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Recurring basis [Abstract]
ARO Trust investments	30.9	17.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Recurring basis [Abstract]
ARO Trust investments	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Recurring basis [Abstract]
ARO Trust investments	0	0
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Recurring basis [Abstract]
ARO Trust investments	30.9	17.8
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Recurring basis [Abstract]
ARO Trust investments	$ 30.9	$ 17.8

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Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Transcontinental Gas Pipe Line Company, LLC
Entity Central Index Key	0000099250
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0

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Transactions with Affiliates (Details Textual) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 employee	Sep. 30, 2012	Sep. 30, 2013 employee	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Affiliated Entity [Member]	Sep. 30, 2012 Affiliated Entity [Member]	Sep. 30, 2013 Affiliated Entity [Member]	Sep. 30, 2012 Affiliated Entity [Member]	Sep. 30, 2013 Williams Partners L.P. [Member]	Dec. 31, 2012 Williams Partners L.P. [Member]	Sep. 30, 2013 Williams Field Services Company [Member]	Sep. 30, 2012 Williams Field Services Company [Member]	Sep. 30, 2013 Williams Field Services Company [Member]	Sep. 30, 2012 Williams Field Services Company [Member]	Oct. 31, 2013 Williams Partners Operating LLC [Member]	Sep. 30, 2013 Williams Partners Operating LLC [Member]	Sep. 30, 2012 Williams Partners Operating LLC [Member]	Sep. 30, 2013 The Williams Companies, Inc.[Member]	Sep. 30, 2012 The Williams Companies, Inc.[Member]	Sep. 30, 2013 The Williams Companies, Inc.[Member]	Sep. 30, 2012 The Williams Companies, Inc.[Member]
Related Party Transaction [Line Items]
Advances to affiliate	$ 470,953,000		$ 470,953,000		$ 312,165,000					$ 471,000,000	$ 312,200,000
Related Party Transaction, Rate			0.01%
Total operating revenues	332,255,000	302,957,000	1,006,196,000	906,600,000		1,600,000	7,500,000	14,100,000	8,600,000
Cost of natural gas sales	27,282,000	15,828,000	87,866,000	36,691,000		1,700,000	800,000	5,700,000	3,200,000
Entity Number of Employees	0		0
RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty																			79,500,000	81,200,000	233,000,000	238,700,000
Total operating costs and expenses	(235,248,000)	(231,945,000)	(696,471,000)	(678,640,000)								600,000	1,100,000	1,700,000	2,700,000
Cash distributions to parent			186,000,000	196,259,000												64,000,000	186,000,000	196,300,000
Cash contributions from parent			$ 203,000,000	$ 117,000,000												$ 61,000,000	$ 203,000,000	$ 117,000,000