The Williams Companies, Inc. (WMB) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 27, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Williams Companies Inc
Entity Central Index Key	107263
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		748,961,482

Consolidated_Statement_of_Inco

Consolidated Statement of Income (Unaudited) (USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Service revenues	$1,197	$819
Product sales	519	930
Total revenues	1,716	1,749
Costs and expenses:
Product costs	462	769
Operating and maintenance expenses	387	298
Depreciation and amortization expenses	427	214
Selling, general, and administrative expenses	196	150
Net insurance recoveries - Geismar Incident	0	-119
Other (income) expense - net	17	17
Total costs and expenses	1,489	1,329
Operating income (loss)	227	420
Equity earnings (losses)	51	-48
Other investing income (loss) - net	0	14
Interest incurred	-273	-169
Interest capitalized	22	29
Other income (expense) - net	16	1
Income (loss) before income taxes	43	247
Provision (benefit) for income taxes	30	51
Net income (loss)	13	196
Less: Net income (loss) attributable to noncontrolling interests	-57	56
Net income (loss) attributable to The Williams Companies, Inc.	$70	$140
Basic earnings (loss) per common share:
Net income (loss)	$0.09	$0.20
Weighted-average shares (thousands)	748,079	684,773
Diluted earnings (loss) per common share:
Net income (loss)	$0.09	$0.20
Weighted-average shares (thousands)	752,028	688,904
Cash dividends declared per common share	$0.58	$0.40

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Comprehensive income (loss):
Net income (loss)	$13	$196
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes	-95	-44
Pension and other postretirement benefits:
Amortization of prior service cost (credit) included in net periodic benefit cost, net of taxes	-1	-1
Amortization of actuarial (gain) loss included in net periodic benefit cost, net of taxes	7	6
Other comprehensive income (loss)	-89	-39
Comprehensive income (loss)	-76	157
Less: Comprehensive income (loss) attributable to noncontrolling interest	-92	56
Comprehensive Income (loss) attributable to The Williams Companies, Inc.	$16	$101

Consolidated_Statement_of_Comp1

Consolidated Statement of Comprehensive Income (Loss) (Parenthetical) (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$16	$1
Other Comprehensive Income Defined Benefit Plans Tax [Abstract]
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Tax	1	1
Other Comprehensive Income Loss Reclassification Pension And Other Postretirement Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Tax	($4)	($3)

Consolidated_Balance_Sheet_Una

Consolidated Balance Sheet (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$341	$240
Accounts and notes receivable - net:
Trade and other	748	972
Income tax receivable	60	167
Deferred income tax asset	67	67
Inventories	200	231
Other current assets and deferred charges	206	213
Total current assets	1,622	1,890
Investments	8,319	8,400
Property, plant and equipment, at cost	37,198	36,435
Accumulated depreciation and amortization	-8,662	-8,354
Property, plant and equipment - net	28,536	28,081
Goodwill	1,145	1,120
Other intangible assets - net of accumulated amortization	10,191	10,453
Regulatory assets, deferred charges, and other	644	619
Total assets	50,457	50,563
Current liabilities:
Accounts payable	728	865
Accrued liabilities	801	900
Commercial paper	0	798
Long-term debt due within one year	801	4
Total current liabilities	2,330	2,567
Long-term debt	21,690	20,888
Deferred income taxes	4,577	4,712
Other noncurrent liabilities	2,279	2,224
Contingent liabilities (Note 12)
Stockholders' equity:
Common stock (960 million shares authorized at $1 par value; 783 million shares issued at March 31, 2015 and 782 million shares issued at December 31, 2014)	783	782
Capital in excess of par value	14,779	14,925
Retained deficit	-5,914	-5,548
Accumulated other comprehensive income (loss)	-395	-341
Treasury stock, at cost (35 million shares of common stock)	-1,041	-1,041
Total stockholders' equity	8,212	8,777
Noncontrolling interests in consolidated subsidiaries	11,369	11,395
Total equity	19,581	20,172
Total liabilities and equity	$50,457	$50,563

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Per Share data, unless otherwise specified
Stockholders' equity:
Common Stock, Shares Authorized	960	960
Common Stock, Par or Stated Value Per Share	$1	$1
Common Stock, Shares Issued	783	782
Treasury Stock, Shares	35	35

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Equity (Unaudited) (USD $)	Total	Common Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Stockholders' Equity	Noncontrolling Interests
In Millions
Beginning balance at Dec. 31, 2014	$20,172	$782	$14,925	($5,548)	($341)	($1,041)	$8,777	$11,395
Net income (loss)	13	0	0	70	0	0	70	-57
Other comprehensive income (loss)	-89	0	0	0	-54	0	-54	-35
Cash dividends - common stock	-434	0	0	-434	0	0	-434	0
Dividends and distributions to noncontrolling interests	-228	0	0	0	0	0	0	-228
Stock-based compensation and related common stock issuances, net of tax	18	1	17	0	0	0	18	0
Changes in ownership of consolidated subsidiaries, net	97	0	-163	0	0	0	-163	260
Contributions from Noncontrolling Interests	26	0	0	0	0	0	0	26
Other	6	0	0	-2	0	0	-2	8
Net increase (decrease) in equity	-591	1	-146	-366	-54	0	-565	-26
Ending balance at Mar. 31, 2015	$19,581	$783	$14,779	($5,914)	($395)	($1,041)	$8,212	$11,369

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income (loss)	$13	$196
Adjustments to reconcile to net cash provided (used) by operating activities:
Depreciation and amortization	427	214
Provision (benefit) for deferred income taxes	28	-96
Amortization of stock-based awards	23	11
Cash provided (used) by changes in current assets and liabilities:
Accounts and notes receivable	300	16
Inventories	32	-27
Other current assets and deferred charges	9	22
Accounts payable	-75	-16
Accrued liabilities	-106	67
Other, including changes in noncurrent assets and liabilities	18	59
Net cash provided (used) by operating activities	669	446
FINANCING ACTIVITIES:
Proceeds from (payments of) commercial paper - net	-799	-225
Proceeds from long-term debt	5,255	1,496
Payments of long-term debt	-3,648	0
Proceeds from issuance of common stock	10	14
Dividends paid	-434	-276
Dividends and distributions paid to noncontrolling interests	-228	-147
Contributions from noncontrolling interests	26	63
Payments for debt issuance costs	-27	-11
Other - net	33	15
Net cash provided (used) by financing activities	188	929
INVESTING ACTIVITIES:
Capital expenditures	-832	-793
Net proceeds from dispositions	0	6
Purchases of and contributions to equity-method investments	-83	-228
Other - net	159	23
Net cash provided (used) by investing activities	-756	-992
Increase (decrease) in cash and cash equivalents	101	383
Cash and cash equivalents at beginning of year	240	681
Cash and cash equivalents at end of period	341	1,064
Increases to property, plant, and equipment	-738	-840
Changes in related accounts payable and accrued liabilities	-94	47
Capital expenditures	($832)	($793)

General_Description_of_Busines

General, Description of Business, and Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General, Description of Business, and Basis of Presentation [Text Block]	Note 1 – General, Description of Business, and Basis of Presentation
	General
	Our accompanying interim consolidated financial statements do not include all the notes in our annual financial statements and, therefore, should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2014, in our Annual Report on Form 10-K. The accompanying unaudited financial statements include all normal recurring adjustments and others that, in the opinion of management, are necessary to present fairly our interim financial statements.
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.
	Unless the context clearly indicates otherwise, references in this report to “we,” “our,” “us,” or like terms refer to The Williams Companies, Inc. and its subsidiaries. Unless the context clearly indicates otherwise, references to “we,” “our,” and “us” include the operations in which we own interests accounted for as equity-method investments that are not consolidated in our financial statements. When we refer to our equity investees by name, we are referring exclusively to their businesses and operations.
	Merger
	On February 2, 2015, we completed the merger of our consolidated master limited partnerships, Williams Partners L.P. (Pre-merger WPZ) and Access Midstream Partners, L.P. (ACMP) (Merger). The merged partnership is named Williams Partners L.P. Under the terms of the merger agreement, each ACMP unitholder received 1.06152 ACMP units for each ACMP unit owned immediately prior to the Merger. In conjunction with the Merger, each Pre-merger WPZ common unit held by the public was exchanged for 0.86672 ACMP common units. Each Pre-merger WPZ common unit held by us was exchanged for 0.80036 ACMP common units. Prior to the closing of the Merger, the Class D limited partner units of Pre-merger WPZ, all of which were held by us, were converted into WPZ common units on a one-for-one basis pursuant to the terms of the WPZ partnership agreement. Following the Merger, we own approximately 60 percent of the merged partnership, including the general partner interest and incentive distribution rights (IDRs). In this report, we refer to the post-merger partnership as “WPZ” and the pre-merger entities as “Pre-merger WPZ” and “ACMP.”
	Description of Business
	Our operations are located principally in the United States and are organized into the Williams Partners and Williams NGL & Petchem Services reportable segments. All remaining business activities are included in Other. For periods after the ACMP Acquisition (See Note 2 – Acquisition), the former Access Midstream segment is now reported within Williams Partners. For periods prior to the ACMP Acquisition, the former Access Midstream segment is now reported within Other. Prior periods segment disclosures have been recast.
	Williams Partners
	Williams Partners consists of our consolidated master limited partnership, Williams Partners L.P. (WPZ), and primarily includes gas pipeline and midstream businesses.
	WPZ’s gas pipeline businesses primarily consist of two interstate natural gas pipelines, which are Transcontinental Gas Pipe Line Company, LLC (Transco) and Northwest Pipeline LLC (Northwest Pipeline), and several joint venture investments in interstate and intrastate natural gas pipeline systems, including a 50 percent equity-method investment in Gulfstream Natural Gas System, L.L.C., and a 41 percent interest in Constitution Pipeline Company, LLC (Constitution) (a consolidated entity).
	WPZ’s midstream businesses primarily consist of (1) natural gas gathering, treating, and processing; (2) natural gas liquid (NGL) fractionation, storage and transportation; (3) oil transportation; and (4) olefins production. The primary service areas are concentrated in major producing basins in Colorado, Texas, Oklahoma, Kansas, New Mexico, Wyoming, the Gulf of Mexico, Louisiana, Pennsylvania, West Virginia, New York, and Ohio which include the Marcellus and Utica shale plays as well as the Eagle Ford, Haynesville, Barnett, Mid-Continent, and Niobrara areas.
	The midstream businesses includes equity-method investments in natural gas gathering and processing assets and NGL fractionation and transportation assets, including a 49 percent equity-method investment in Utica East Ohio Midstream, LLC (UEOM), a 50 percent equity-method investment in the Delaware basin gas gathering system in the Mid-Continent region, a 69 percent equity-method investment in Laurel Mountain Midstream, LLC, a 58 percent equity-method investment in Caiman Energy II, LLC, a 60 percent equity-method investment in Discovery Producer Services LLC, a 50 percent equity-method investment in Overland Pass Pipeline, LLC, and Appalachia Midstream Services, LLC, which owns an approximate average 45 percent equity-method investment interest in 11 gas gathering systems in the Marcellus Shale. Subsequent to March 31, 2015, WPZ announced an agreement to acquire an additional equity interest in UEOM. Refer to Note 14 – Subsequent Events for further information.
	The midstream businesses also include our Canadian midstream operations, which are comprised of an oil sands offgas processing plant near Fort McMurray, Alberta, an NGL/olefin fractionation facility and butylene/butane splitter facility at Redwater, Alberta, and the Boreal Pipeline.
	Williams NGL & Petchem Services
	Williams NGL & Petchem Services includes certain other domestic olefins pipeline assets and certain Canadian growth projects under development (including a propane dehydrogenation facility and a liquids extraction plant).
	Other
	Other includes other business activities that are not operating segments, as well as corporate operations.
	Basis of Presentation
	Consolidated master limited partnership
	As of March 31, 2015, we own approximately 60 percent of the interests in WPZ, including the interests of the general partner, which are wholly owned by us, and IDRs.
	The previously described Merger and other equity issuances by WPZ had the combined net impact of increasing Noncontrolling interests in consolidated subsidiaries by $260 million and decreasing Capital in excess of par value by $163 million and Deferred income taxes by $97 million in the Consolidated Balance Sheet.
	WPZ is self-funding and maintains separate lines of bank credit and cash management accounts and also has a commercial paper program. (See Note 9 – Debt and Banking Arrangements.) Cash distributions from WPZ to us, including any associated with our IDRs, occur through the normal partnership distributions from WPZ to all partners.
	Discontinued operations
	Unless indicated otherwise, the information in the Notes to Consolidated Financial Statements relates to our continuing operations.
	Accounting standards issued but not yet adopted
	In February 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2015-2 “Amendments to the Consolidation Analysis” (ASU 2015-2). ASU 2015-2 alters the models used to determine consolidation conclusions for certain entities, including limited partnerships, and may require additional disclosures. The ASU is effective for financial statements issued for reporting periods beginning after December 15, 2015 and interim periods within the reporting periods with either retrospective or modified retrospective presentation allowed. We will adopt the standard in the first quarter of 2016. We are currently evaluating the impact of the new standard on our consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-3 “Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs” (ASU 2015-3). ASU 2015-3 simplifies the presentation of debt issuance costs by requiring such costs be presented as a deduction from the corresponding debt liability. The guidance is effective for financial statements issued for reporting periods beginning after December 15, 2015 and interim periods within the reporting periods and requires retrospective presentation. We will adopt the standard in the first quarter of 2016. We are evaluating the impact of the new standard.
	In May 2014, the FASB issued ASU 2014-09 establishing Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (ASC 606). ASC 606 establishes a comprehensive new revenue recognition model designed to depict the transfer of goods or services to a customer in an amount that reflects the consideration the entity expects to be entitled to receive in exchange for those goods or services and requires significantly enhanced revenue disclosures. The standard is effective for annual reporting periods beginning after December 15, 2016, and interim periods within the reporting period. The FASB has recently proposed delaying the effective date of ASC 606 to annual and interim periods beginning after December 15, 2017. Accordingly, if the FASB chooses to delay the effective date to December 15, 2017, we would plan to adopt this standard in the first quarter of 2018. ASC 606 allows either full retrospective or modified retrospective transition and early adoption is not permitted. We continue to evaluate both the impact of this new standard on our consolidated financial statements and the transition method we will utilize for adoption.

Acquisition

Acquisition	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisition [Text Block]	Note 2 – Acquisition
	We acquired control of ACMP on July 1, 2014 (ACMP Acquisition). Our basis in ACMP reflects business combination accounting, which, among other things, requires identifiable assets acquired and liabilities assumed to be measured at their acquisition-date fair values.
	The following table presents the allocation of the acquisition-date fair value of the major classes of the assets acquired, which are presented in the Williams Partners segment, liabilities assumed, and noncontrolling interest at July 1, 2014. Changes since the preliminary allocation disclosed in our Annual Report on Form 10-K for the year ended December 31, 2014 reflect an increase of $150 million in property, plant and equipment – net and $25 million in goodwill, and a decrease of $168 million in other intangible assets and $7 million in investments. These adjustments during the measurement period were not considered significant to require retrospective revisions of our financial statements.
		(Millions)
	Accounts receivable	$	168
	Other current assets	63
	Investments	5,865
	Property, plant, and equipment – net	7,165
	Goodwill	499
	Other intangible assets	8,841
	Current liabilities	(408		)
	Debt	(4,052		)
	Other noncurrent liabilities	(9		)
	Noncontrolling interest in ACMP’s subsidiaries	(958		)
	Noncontrolling interest in ACMP	(6,544		)

Variable_Interest_Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2015
Variable Interest Entity Disclosures [Abstract]
Variable Interest Entities [Textblock]	Note 3 – Variable Interest Entities
	As of March 31, 2015, we consolidate the following variable interest entities (VIEs):
	Gulfstar One
	WPZ owns a 51 percent interest in Gulfstar One LLC (Gulfstar One), a subsidiary that, due to certain risk-sharing provisions in its customer contracts, is a VIE. WPZ is the primary beneficiary because it has the power to direct the activities that most significantly impact Gulfstar One’s economic performance. WPZ, as construction agent for Gulfstar One, designed, constructed, and installed a proprietary floating-production system, Gulfstar FPS™, and associated pipelines which began providing production handling and gathering services for the Tubular Bells oil and gas discovery in the eastern deepwater Gulf of Mexico in the fourth quarter of 2014. WPZ received certain advance payments from the producer customers. In certain circumstances, the producer customers could be responsible for Gulfstar One’s unrecovered portion of the firm price of building the facilities if the production handling agreement is terminated. Construction of an expansion project is underway that will provide production handling and gathering services for the Gunflint oil and gas discovery in the eastern deepwater Gulf of Mexico. The expansion project is expected to be in service in the first quarter of 2016. The current estimate of the total remaining construction costs for the expansion project is approximately $116 million, which we expect will be funded with revenues received from customers and capital contributions from WPZ and the other equity partner on a proportional basis.
	Constitution
	WPZ owns a 41 percent interest in Constitution, a subsidiary that, due to shipper fixed-payment commitments under its firm transportation contracts, is a VIE. WPZ is the primary beneficiary because it has the power to direct the activities that most significantly impact Constitution’s economic performance. WPZ, as construction agent for Constitution, is building a pipeline connecting our gathering system in Susquehanna County, Pennsylvania, to the Iroquois Gas Transmission and the Tennessee Gas Pipeline systems. WPZ plans to place the project in service in the second half of 2016 and estimates the total remaining construction costs of the project to be approximately $604 million, which is expected to be funded with capital contributions from WPZ and the other equity partners on a proportional basis.
	Cardinal
	WPZ owns a 66 percent interest in Cardinal Gas Services, L.L.C (Cardinal), a subsidiary that, due to certain risks shared with customers, is a VIE. WPZ is the primary beneficiary because it has the power to direct the activities that most significantly impact Cardinal’s economic performance. WPZ, as operator for Cardinal, designed, constructed, and installed associated pipelines which provide production handling and gathering services for the Utica region. WPZ has received certain advance payments from the equity partners during the construction process. Future construction activity which is expected to be funded with capital contributions from WPZ and the other equity partners on a proportional basis.
	Jackalope
	WPZ owns a 50 percent interest in Jackalope Gas Gathering Services, L.L.C (Jackalope), a subsidiary that, due to certain risks shared with customers, is a VIE. WPZ is the primary beneficiary because it has the power to direct the activities that most significantly impact Jackalope’s economic performance. WPZ, as operator for Jackalope, designed, constructed, and installed associated pipelines which provide production handling and gathering services for the Niobrara region. Although still under construction, parts of Jackalope are operating and made limited contributions to operations in 2014 and the first quarter of 2015. WPZ has received certain advance payments from the equity partner during the construction process. Future construction activity which is expected to be funded with capital contributions from WPZ and the other equity partner on a proportional basis.
	The following table presents amounts included in our Consolidated Balance Sheet that are for the use or obligation of our consolidated VIEs.
		March 31,			31-Dec-14			Classification
		2015
		(Millions)
	Assets (liabilities):
	Cash and cash equivalents	$	58		$	113		Cash and cash equivalents
	Accounts receivable	71			52			Accounts and notes receivable, net – Trade and other
	Other current assets	3			3			Other current assets and deferred charges
	Property, plant and equipment, net	2,877			2,794			Property, plant and equipment – net
	Goodwill	107			103			Goodwill
	Other intangible assets, net	1,474			1,493			Other intangible assets, net of accumulated amortization
	Other noncurrent assets	3			14			Regulatory assets, deferred charges, and other
	Accounts payable	(40		)	(48		)	Accounts payable
	Accrued liabilities	(36		)	(36		)	Accrued liabilities
	Current deferred revenue	(45		)	(45		)	Accrued liabilities
	Noncurrent deferred income taxes	—			(13		)	Deferred income taxes
	Asset retirement obligation	(94		)	(94		)	Other noncurrent liabilities
	Noncurrent deferred revenue associated with customer advance payments	(389		)	(395		)	Other noncurrent liabilities

Other_Income_and_Expenses

Other Income and Expenses	3 Months Ended
	Mar. 31, 2015
Other Income and Expenses [Abstract]
Other income and expenses [Textblock]	Note 4 – Other Income and Expenses
	Geismar Incident
	On June 13, 2013, an explosion and fire occurred at Williams Partners’ Geismar olefins plant. The incident (Geismar Incident) rendered the facility temporarily inoperable and resulted in significant human, financial, and operational effects.
	At the time of the incident, we had insurance coverage for repair and replacement costs, lost production, and additional expenses related to the incident as follows:
	•	Property damage and business interruption coverage with a combined per-occurrence limit of $500 million and retentions (deductibles) of $10 million per occurrence for property damage and a waiting period of 60 days per occurrence for business interruption;
	•	General liability coverage with per-occurrence and aggregate annual limits of $610 million and retentions (deductibles) of $2 million per occurrence;
	•	Workers’ compensation coverage with statutory limits and retentions (deductibles) of $1 million total per occurrence.
	During the first quarter of 2014, we received $125 million of insurance recoveries related to the Geismar Incident and incurred $6 million of related covered insurable expenses in excess of our retentions (deductibles). These amounts are reported within Williams Partners and reflected as a net gain in Net insurance recoveries – Geismar Incident in the Consolidated Statement of Income.
	Since June 2013, we have settled claims associated with $480 million of available property damage and business interruption coverage for a total of $422 million. This total includes $126 million expected to be received during the second quarter of 2015. The remaining insurance limits total approximately $20 million and we are vigorously pursuing collection.
	Additional Items
	Selling, general, and administrative expenses in 2015 includes $25 million of professional advisory fees associated with the Merger and $4 million of related employee transition costs, reported primarily within the Williams Partners segment, in addition to $6 million of general corporate expenses associated with integration and re-alignment of resources. Operating and maintenance expenses in 2015 also includes $4 million of related employee transition costs reported within the Williams Partners segment.
	The three months ended March 31, 2014, includes $19 million of project development costs related to the Bluegrass Pipeline Company LLC (Bluegrass Pipeline) reported within Williams NGL & Petchem Services and reflected in Selling, general, and administrative expenses in the Consolidated Statement of Income.
	Equity earnings (losses) for the three months ended March 31, 2014 includes $70 million of losses reported within Williams NGL & Petchem Services related to the write-off of previously capitalized project development costs by Bluegrass Pipeline, Moss Lake Fractionation LLC, and Moss Lake LPG Terminal LLC after our management decided to discontinue further funding of the projects. These entities were dissolved in the fourth quarter of 2014.
	The three months ended March 31, 2014, includes $13 million of interest income associated with a receivable related to the sale of certain former Venezuela assets reflected in Other investing income (loss) – net in the Consolidated Statement of Income. Due to changes in circumstances that have led to late payments and increased uncertainty regarding the recovery of the receivable, we have begun accounting for the receivable under a cost recovery model. As a result, no interest income was recognized in the first quarter of 2015.
	Other income (expense) – net below Operating income (loss) includes $17 million and $3 million for allowance for equity funds used during construction (AFUDC) reported within Williams Partners for the three months ended March 31, 2015 and 2014, respectively. AFUDC increased during 2015 due to the increase in spending on various Transco expansion projects and Constitution.

Provision_Benefit_for_Income_T

Provision (Benefit) for Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Provision (Benefit) for Income Taxes	Note 5 – Provision (Benefit) for Income Taxes
	The Provision (benefit) for income taxes includes:
		Three months ended
		March 31,
		2015		2014
		(Millions)
	Current:
	Federal	$	—	$	137
	State	—		5
	Foreign	2		2
		2		144
	Deferred:
	Federal	25		(96		)
	State	3		(1		)
	Foreign	—		4
		28		(93		)
	Total provision (benefit)	$	30	$	51
	The effective income tax rate for the total provision for the three months ended March 31, 2015, is greater than the federal statutory rate primarily due to a $14 million tax provision associated with an adjustment to the prior year taxable foreign income and the effect of state income taxes, partially offset by the impact of nontaxable noncontrolling interests.
	The effective income tax rate for the total provision for the three months ended March 31, 2014, is less than the federal statutory rate primarily due to a tax benefit related to our contribution of certain Canadian operations to WPZ and the impact of nontaxable noncontrolling interests, partially offset by the effect of state income taxes and taxes on foreign operations.
	During the next 12 months, we do not expect ultimate resolution of any unrecognized tax benefit associated with domestic or international matters to have a material impact on our unrecognized tax benefit position.

Earnings_Loss_Per_Common_Share

Earnings (Loss) Per Common Share from Continuing Operations	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share from Continuing Operations	Note 6 – Earnings (Loss) Per Common Share
		Three months ended
		March 31,
		2015		2014
		(Dollars in millions, except per-share
		amounts; shares in thousands)
	Net income (loss) attributable to The Williams Companies, Inc. available to common stockholders for basic and diluted earnings (loss) per common share	$	70	$	140
	Basic weighted-average shares	748,079		684,773
	Effect of dilutive securities:
	Nonvested restricted stock units	2,217		2,096
	Stock options	1,715		2,017
	Convertible debentures	17		18
	Diluted weighted-average shares	752,028		688,904
	Net income (loss) per common share:
	Basic	$	0.09	$	0.2
	Diluted	$	0.09	$	0.2

Employee_Benefit_Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Note 7 – Employee Benefit Plans
	Net periodic benefit cost (credit) is as follows:
		Pension Benefits
		Three months ended
		March 31,
		2015			2014
		(Millions)
	Components of net periodic benefit cost:
	Service cost	$	14		$	10
	Interest cost	15			16
	Expected return on plan assets	(19		)	(19		)
	Amortization of net actuarial loss	11			9
	Net periodic benefit cost	$	21		$	16
		Other Postretirement Benefits
		Three months ended
		March 31,
		2015			2014
		(Millions)
	Components of net periodic benefit cost (credit):
	Service cost	$	1		$	1
	Interest cost	2			2
	Expected return on plan assets	(3		)	(3		)
	Amortization of prior service credit	(4		)	(5		)
	Reclassification to regulatory liability	1			1
	Net periodic benefit cost (credit)	$	(3	)	$	(4	)
	Amortization of prior service credit and net actuarial loss included in net periodic benefit cost (credit) for our other postretirement benefit plans associated with Transco and Northwest Pipeline are recorded to regulatory assets/liabilities instead of other comprehensive income (loss). The amounts of amortization of prior service credit recognized in regulatory liabilities were $2 million and $3 million for the three months ended March 31, 2015 and 2014, respectively.
	During the three months ended March 31, 2015, we contributed $16 million to our pension plans and $1 million to our other postretirement benefit plans. We presently anticipate making additional contributions of approximately $47 million to our pension plans and approximately $6 million to our other postretirement benefit plans in the remainder of 2015.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Inventories	Note 8 – Inventories
		March 31,		December 31,
		2015		2014
		(Millions)
	Natural gas liquids, olefins, and natural gas in underground storage	$	122	$	150
	Materials, supplies, and other	78		81
		$	200	$	231

Debt_and_Banking_Arrangements

Debt and Banking Arrangements	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Note 9 – Debt and Banking Arrangements
	Long-Term Debt
	Issuances and retirements
	On April 15, 2015, WPZ paid $783 million, including a redemption premium, to early retire $750 million of 5.875 percent senior notes due 2021. At March 31, 2015, we classified the $798 million carrying value of these notes in Long-term debt due within one year in the Consolidated Balance Sheet.
	On March 3, 2015, WPZ completed a public offering of $1.25 billion of 3.6 percent senior unsecured notes due 2022, $750 million of 4 percent senior unsecured notes due 2025, and $1 billion of 5.1 percent senior unsecured notes due 2045. WPZ used the net proceeds to repay amounts outstanding under its commercial paper program and credit facility, to fund capital expenditures, and for general partnership purposes.
	WPZ retired $750 million of 3.8 percent senior unsecured notes that matured on February 15, 2015.
	Commercial Paper Program
	As of April 29, 2015, WPZ had $521 million of Commercial paper outstanding under its $3 billion commercial paper program.
	Credit Facilities
	On February 2, 2015, we entered into a Credit Agreement with aggregate commitments remaining at $1.5 billion, and the credit facilities for Pre-merger WPZ and ACMP were terminated in connection with the Merger. WPZ also entered into a $3.5 billion credit facility.
		31-Mar-15
		Stated Capacity		Outstanding
		(Millions)
	WMB
	Loans	$	1,500	$	375
	Swingline loans sublimit	50		—
	Letters of credit sublimit	675		—
	Letters of credit under certain bilateral bank agreements			15
	WPZ
	Loans	3,500		—
	Swingline loans sublimit	150		—
	Letters of credit sublimit	1,125		2
	Letters of credit under certain bilateral bank agreements			3
	On February 3, 2015, WPZ entered into a $1.5 billion short-term credit facility. In accordance with its terms, this facility terminated on March 3, 2015, upon the completion of the previously described debt offering. WPZ did not borrow under this credit facility.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Stockholders' Equity [Textblock]	Note 10 – Stockholders’ Equity
	The following table presents the changes in Accumulated other comprehensive income (loss) by component, net of income taxes:
		Cash				Foreign			Pension and			Total
		Flow				Currency			Other Post
		Hedges				Translation			Retirement
									Benefits
		(Millions)
	Balance at December 31, 2014	$	(1	)		$	31		$	(371	)	$	(341	)
	Other comprehensive income (loss) before reclassifications	—				(60		)	—			(60		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—				—			6			6
	Other comprehensive income (loss)	—				(60		)	6			(54		)
	Balance at March 31, 2015	$	(1	)		$	(29	)	$	(365	)	$	(395	)
	Reclassifications out of Accumulated other comprehensive income (loss) are presented in the following table by
	component for the three months ended March 31, 2015:
	Component		Reclassifications				Classification
			(Millions)
	Pension and other postretirement benefits:
	Amortization of prior service cost (credit) included in net periodic benefit cost		$	(2	)		Note 7 – Employee Benefit Plans
	Amortization of actuarial (gain) loss included in net periodic benefit cost		11				Note 7 – Employee Benefit Plans
	Total pension and other postretirement benefits, before income taxes		9
	Income tax benefit		(3		)		Provision (benefit) for income taxes
	Reclassifications during the period		$	6

Fair_Value_Measurements_and_Gu

Fair Value Measurements and Guarantees	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 11 – Fair Value Measurements and Guarantees
	The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities. The carrying values of cash and cash equivalents, accounts receivable, commercial paper, and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
								Fair Value Measurements Using
		Carrying			Fair			Quoted		Significant			Significant
		Amount			Value			Prices In		Other			Unobservable
								Active		Observable			Inputs
								Markets for		Inputs			(Level 3)
								Identical		(Level 2)
								Assets
								(Level 1)
		(Millions)
	Assets (liabilities) at March 31, 2015:
	Measured on a recurring basis:
	ARO Trust investments	$	60		$	60		$	60	$	—		$	—
	Energy derivatives assets not designated as hedging instruments	2			2			—		—			2
	Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
	Additional disclosures:
	Notes receivable and other	13			16			1		3			12
	Long-term debt, including current portion (1)	(22,487		)	(23,003		)	—		(23,003		)	—
	Guarantee	(30		)	(25		)	—		(25		)	—
	Assets (liabilities) at December 31, 2014:
	Measured on a recurring basis:
	ARO Trust investments	$	48		$	48		$	48	$	—		$	—
	Energy derivatives assets not designated as hedging instruments	3			3			1		—			2
	Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
	Additional disclosures:
	Notes receivable and other	30			57			—		4			53
	Long-term debt, including current portion (1)	(20,887		)	(21,131		)	—		(21,131		)	—
	Guarantee	(31		)	(27		)	—		(27		)	—
	___________________________________
	(1) Excludes capital leases
	Fair Value Methods
	We use the following methods and assumptions in estimating the fair value of our financial instruments:
	Assets and liabilities measured at fair value on a recurring basis
	ARO Trust investments: Transco deposits a portion of its collected rates, pursuant to its rate case settlement, into an external trust (ARO Trust) that is specifically designated to fund future asset retirement obligations (ARO). 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, is classified as available-for-sale, and is reported in Regulatory assets, deferred charges, and other in the Consolidated Balance Sheet. Both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities.
	Energy derivatives: Energy derivatives include commodity based exchange-traded contracts and over-the-counter (OTC) contracts, which consist of physical forwards, futures, and swaps that are measured at fair value on a recurring basis. The fair value amounts are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements. Further, the amounts do not include cash held on deposit in margin accounts that we have received or remitted to collateralize certain derivative positions. Energy derivatives assets are reported in Other current assets and deferred charges and Regulatory assets, deferred charges, and other in the Consolidated Balance Sheet. Energy derivatives liabilities are reported in Accrued liabilities and Other noncurrent liabilities in the Consolidated Balance Sheet.
	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 three months ended March 31, 2015 or 2014.
	Additional fair value disclosures
	Notes receivable and other:  Notes receivable and other consists of various notes, including a receivable related to the sale of certain former Venezuela assets. The disclosed fair value of this receivable is determined by an income approach. We calculated the net present value of a probability-weighted set of cash flows utilizing assumptions based on contractual terms, historical payment patterns by the counterparty, future probabilities of default, our likelihood of using arbitration if the counterparty does not perform, and discount rates. We determined the fair value of the receivable to be $12 million at March 31, 2015. The carrying value of this receivable is $8 million at March 31, 2015. The current and noncurrent portions of our receivables are reported in Accounts and notes receivable, net and Regulatory assets, deferred charges, and other, respectively, in the 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.
	Guarantee: The guarantee represented in the table consists of a guarantee we have provided in the event of nonpayment by our previously owned communications subsidiary, Williams Communications Group (WilTel), on a lease performance obligation that extends through 2042.
	To estimate the disclosed fair value of the guarantee, an estimated default rate is applied to the sum of the future contractual lease payments using an income approach. The estimated default rate is determined by obtaining the average cumulative issuer-weighted corporate default rate based on the credit rating of WilTel’s current owner and the term of the underlying obligation. The default rate is published by Moody’s Investors Service. This guarantee is reported in Accrued liabilities in the Consolidated Balance Sheet.
	Guarantees
	We are required by our revolving credit agreements to indemnify lenders for certain taxes required to be withheld from payments due to the lenders and for certain tax payments made by the lenders. The maximum potential amount of future payments under these indemnifications is based on the related borrowings and such future payments cannot currently be determined. These indemnifications generally continue indefinitely unless limited by the underlying tax regulations and have no carrying value. We have never been called upon to perform under these indemnifications and have no current expectation of a future claim.
	Regarding our previously described guarantee of Wiltel’s lease performance, the maximum potential exposure is approximately $34 million at March 31, 2015. Our exposure declines systematically throughout the remaining term of WilTel’s obligation.
	We have provided guarantees in the event of nonpayment by our previously owned subsidiary, WPX Energy, Inc. (WPX), on certain contracts, primarily a natural gas purchase contract extending through 2023. We estimate the maximum undiscounted potential future payment obligation under these remaining guarantees is approximately $39 million at March 31, 2015. Our recorded liability for these guarantees, which considers our estimate of the fair value of the guarantees, is insignificant.

Contingent_Liabilities

Contingent Liabilities	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities	Note 12 – Contingent Liabilities
	Indemnification of WPX
	We have agreed to indemnify our former affiliate, WPX and its subsidiaries, related to the following matter.
	Reporting of natural gas-related information to trade publications
	Direct and indirect purchasers of natural gas in various states filed class actions against WPX and others alleging the manipulation of published gas price indices and seeking unspecified amounts of damages. Such actions were transferred to the Nevada federal district court for consolidation of discovery and pre-trial issues.
	In 2011, the Nevada district court granted WPX’s joint motions for summary judgment to preclude the plaintiffs’ state law claims because the federal Natural Gas Act gives the FERC exclusive jurisdiction to resolve those issues. The court also denied the plaintiffs’ class certification motion as moot. The plaintiffs appealed the court’s ruling and on April 10, 2013, the Ninth Circuit Court of Appeals reversed the district court and remanded the cases to the district court to permit the plaintiffs to pursue their state antitrust claims for natural gas sales that were not subject to FERC jurisdiction under the Natural Gas Act. On April 21, 2015, the U.S. Supreme Court upheld a Ninth Circuit ruling that revived state law claims in multi-district litigation against WPX and others, rejecting arguments that the claims are preempted by the Natural Gas Act. The U.S. Supreme Court remanded the cases to the Nevada district court for further proceedings. Because of the uncertainty around the remaining pending unresolved issues, including an insufficient description of the purported classes and other related matters, we cannot reasonably estimate a range of potential exposures at this time. However, it is reasonably possible that the ultimate resolution of these items and our related indemnification obligation could result in future charges that may be material to our results of operations. In connection with this indemnification, we have an accrued liability balance associated with this matter, and as a result, have an indirect exposure to future developments in this matter.
	Other Legal Matters
	Geismar Incident
	As a result of the previously discussed Geismar Incident, there were two fatalities and numerous individuals (including employees and contractors) reported injuries, which varied from minor to serious. We are addressing the following matters in connection with the Geismar Incident.
	On October 21, 2013, the EPA issued an Inspection Report pursuant to the Clean Air Act’s Risk Management Program following its inspection of the facility on June 24 through 28, 2013. The report notes the EPA’s preliminary determinations about the facility’s documentation regarding process safety, process hazard analysis, as well as operating procedures, employee training, and other matters. On June 16, 2014, we received a request for information related to the Geismar Incident from the EPA under Section 114 of the Clean Air Act to which we responded on August 13, 2014. The EPA could issue penalties pertaining to final determinations.
	Multiple lawsuits, including class actions for alleged offsite impacts, property damage, customer claims, and personal injury, have been filed against us. The first trial for certain plaintiffs claiming approximately $45 million in personal injury damages is set to begin on June 15, 2015 in Iberville Parish, Louisiana. For these and all other unsettled lawsuits, in the event of an adverse ruling, we intend to appeal and we expect any ultimate losses to be covered by our general liability insurance policy, which has an aggregate annual limit of $610 million and retention (deductible) of $2 million per occurrence. For these matters, we believe it is reasonably possible that losses will be incurred. However, due to ongoing litigation concerning defenses to liability, the number of individual plaintiffs, limited information as to the nature and extent of all plaintiffs’ damages, and the ultimate outcome of all appeals, we are unable to reliably estimate a range of reasonably possible loss at this time. We believe that it is probable that any ultimate losses incurred will be covered by insurance.
	Alaska refinery contamination litigation
	In 2010, James West filed a class action lawsuit in state court in Fairbanks, Alaska on behalf of individual property owners whose water contained sulfolane contamination allegedly emanating from the Flint Hills Oil Refinery in North Pole, Alaska. The suit named our subsidiary, Williams Alaska Petroleum Inc. (WAPI), and Flint Hills Resources Alaska, LLC (FHRA), a subsidiary of Koch Industries, Inc., as defendants. We owned and operated the refinery until 2004 when we sold it to FHRA. We and FHRA made claims under the pollution liability insurance policy issued in connection with the sale of the North Pole refinery to FHRA. We and FHRA also filed claims against each other seeking, among other things, contractual indemnification alleging that the other party caused the sulfolane contamination.
	In 2011, we and FHRA settled the James West claim. We and FHRA subsequently filed motions for summary judgment on the other’s claims. On July 8, 2014, the court dismissed all FHRA’s claims and entered judgment for us. On August 6, 2014, FHRA appealed the court’s decision to the Alaska Supreme Court.
	We currently estimate that our reasonably possible loss exposure in this matter could range from an insignificant amount up to $32 million, although uncertainties inherent in the litigation process, expert evaluations, and jury dynamics might cause our exposure to exceed that amount.
	On November 26, 2014, the City of North Pole (North Pole) filed suit in Alaska state court in Fairbanks against FHRA and WAPI, alleging nuisance and violations of municipal and state statutes based upon the sulfolane contamination allegedly emanating from the North Pole refinery. North Pole claims an unspecified amount of past and future damages as well as punitive damages against WAPI.
	Independent of the litigation matter described in the preceding paragraphs, in 2013, the Alaska Department of Environmental Conservation (ADEC) indicated that it views FHRA and us as responsible parties, and that it intended to enter a compliance order to address the environmental remediation of sulfolane and other possible contaminants including cleanup work outside the refinery’s boundaries. On March 6, 2014, the State of Alaska filed suit against FHRA and us in state court in Fairbanks seeking injunctive relief and damages in connection with the sulfolane contamination. On May 5, 2014, FHRA filed cross-claims against us in the State of Alaska suit, and FHRA also seeks injunctive relief and damages. Due to the ongoing assessment of the level and extent of sulfolane contamination and the ultimate cost of remediation and division of costs among the potentially responsible parties, we are unable to estimate a range of exposure at this time.
	Royalty Matters
	Certain of our customers, including one major customer, have been named in various lawsuits alleging underpayment of royalties. In certain of these cases, we have also been named as a defendant based on allegations that we improperly participated with that major customer in causing the alleged royalty underpayments. We have also received subpoenas from the United States Department of Justice and the Pennsylvania Attorney General requesting documents relating to the agreements between us and our major customer and calculations of the major customer’s royalty payments. We believe that the claims asserted to date are subject to indemnity obligations owed to us by that major customer. Due to the preliminary status of the cases, we are unable to estimate a range of liability at this time.
	Environmental Matters
	We are a participant in certain environmental activities in various stages including assessment studies, cleanup operations and remedial processes at certain sites, some of which we currently do not own. We are monitoring these sites in a coordinated effort with other potentially responsible parties, the EPA, and other governmental authorities. We are jointly and severally liable along with unrelated third parties in some of these activities and solely responsible in others. Certain of our subsidiaries have been identified as potentially responsible parties at various Superfund and state waste disposal sites. In addition, these subsidiaries have incurred, or are alleged to have incurred, various other hazardous materials removal or remediation obligations under environmental laws. As of March 31, 2015, we have accrued liabilities totaling $43 million for these matters, as discussed below. Our accrual reflects the most likely costs of cleanup, which are generally based on completed assessment studies, preliminary results of studies or our experience with other similar cleanup operations. Certain assessment studies are still in process for which the ultimate outcome may yield significantly different estimates of most likely costs. Any incremental amount in excess of amounts currently accrued cannot be reasonably estimated at this time due to uncertainty about the actual number of contaminated sites ultimately identified, the actual amount and extent of contamination discovered and the final cleanup standards mandated by the EPA and other governmental authorities.
	The EPA and various state regulatory agencies routinely promulgate and propose new rules, and issue updated guidance to existing rules. More recent rules and rulemakings include, but are not limited to, rules for reciprocating internal combustion engine maximum achievable control technology, new air quality standards for ground level ozone, one hour nitrogen dioxide emission limits, and new air quality standards impacting storage vessels, pressure valves, and compressors. We are unable to estimate the costs of asset additions or modifications necessary to comply with these new regulations due to uncertainty created by the various legal challenges to these regulations and the need for further specific regulatory guidance.
	Continuing operations
	Our interstate gas pipelines are involved in remediation activities related to certain facilities and locations for polychlorinated biphenyls, mercury, and other hazardous substances. These activities have involved the EPA and various state environmental authorities, resulting in our identification as a potentially responsible party at various Superfund waste sites. At March 31, 2015, we have accrued liabilities of $10 million for these costs. We expect that these costs will be recoverable through rates.
	We also accrue environmental remediation costs for natural gas underground storage facilities, primarily related to soil and groundwater contamination. At March 31, 2015, we have accrued liabilities totaling $8 million for these costs.
	Former operations, including operations classified as discontinued
	We have potential obligations in connection with assets and businesses we no longer operate. These potential obligations include remediation activities at the direction of federal and state environmental authorities and the indemnification of the purchasers of certain of these assets and businesses for environmental and other liabilities existing at the time the sale was consummated. Our responsibilities relate to the operations of the assets and businesses described below.
	•	Former agricultural fertilizer and chemical operations and former retail petroleum and refining operations;
	•	Former petroleum products and natural gas pipelines;
	•	Former petroleum refining facilities;
	•	Former exploration and production and mining operations;
	•	Former electricity and natural gas marketing and trading operations.
	At March 31, 2015, we have accrued environmental liabilities of $25 million related to these matters.
	Other Divestiture Indemnifications
	Pursuant to various purchase and sale agreements relating to divested businesses and assets, we have indemnified certain purchasers against liabilities that they may incur with respect to the businesses and assets acquired from us. The indemnities provided to the purchasers are customary in sale transactions and are contingent upon the purchasers incurring liabilities that are not otherwise recoverable from third parties. The indemnities generally relate to breach of warranties, tax, historic litigation, personal injury, property damage, environmental matters, right of way and other representations that we have provided.
	At March 31, 2015, other than as previously disclosed, we are not aware of any material claims against us involving the indemnities; thus, we do not expect any of the indemnities provided pursuant to the sales agreements to have a material impact on our future financial position. Any claim for indemnity brought against us in the future may have a material adverse effect on our results of operations in the period in which the claim is made.
	In addition to the foregoing, various other proceedings are pending against us which are incidental to our operations.
	Summary
	We have disclosed our estimated range of reasonably possible losses for certain matters above, as well as all significant matters for which we are unable to reasonably estimate a range of possible loss. We estimate that for all other matters for which we are able to reasonably estimate a range of loss, our aggregate reasonably possible losses beyond amounts accrued 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.

Segment_Disclosures

Segment Disclosures	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Disclosures	Note 13 – Segment Disclosures
	Our reportable segments are Williams Partners and Williams NGL & Petchem Services. All remaining business activities are included in Other. (See Note 1 – General, Description of Business, and Basis of Presentation.)
	Performance Measurement
	Prior to first quarter of 2015, we evaluated segment operating performance based on Segment profit (loss) from operations. Beginning in the first quarter of 2015, we evaluate segment operating performance based upon Modified EBITDA (earnings before interest, taxes, depreciation and amortization). This measure represents the basis of our internal financial reporting and is the primary performance measure used by our chief operating decision maker in measuring performance and allocating resources among our reportable segments. Prior period segment disclosures have been recast to reflect this change.
	We define Modified EBITDA as follows:
	•Net income (loss) before:
	◦Provision (benefit) for income taxes;
	◦Interest incurred, net of interest capitalized;
	◦Equity earnings (losses);
	◦Other investing income (loss) – net;
	◦Depreciation and amortization expenses;
	◦Accretion expense associated with asset retirement obligations for nonregulated operations.
	•	This measure is further adjusted to include our proportionate share (based on ownership interest) of Modified EBITDA from our equity-method investments calculated consistent with the definition described above.
	The following table reflects the reconciliation of Segment revenues to Total revenues as reported in the Consolidated Statement of Income and Total assets by reportable segment.
		Williams			Williams			Other		Eliminations			Total
		Partners			NGL & Petchem
					Services (1)
		(Millions)
	Three months ended March 31, 2015
	Segment revenues:
	Service revenues
	External	$	1,192		$	—		$	5	$	—		$	1,197
	Internal	—			—			21		(21		)	—
	Total service revenues	1,192			—			26		(21		)	1,197
	Product sales
	External	519			—			—		—			519
	Internal	—			—			—		—			—
	Total product sales	519			—			—		—			519
	Total revenues	$	1,711		$	—		$	26	$	(21	)	$	1,716
	Three months ended March 31, 2014
	Segment revenues:
	Service revenues
	External	$	763		$	—		$	56	$	—		$	819
	Internal	—			—			3		(3		)	—
	Total service revenues	763			—			59		(3		)	819
	Product sales
	External	930			—			—		—			930
	Internal	—			—			—		—			—
	Total product sales	930			—			—		—			930
	Total revenues	$	1,693		$	—		$	59	$	(3	)	$	1,749
	March 31, 2015
	Total assets	$	49,284		$	656		$	1,101	$	(584	)	$	50,457
	December 31, 2014
	Total assets	$	49,322		$	612		$	1,220	$	(591	)	$	50,563
	_________________
	(1) Includes certain projects under development and thus no reported revenues to date.
	The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Income.
		Three months ended March 31,
		2015			2014
		(Millions)
	Modified EBITDA by Segment:
	Williams Partners	$	817		$	708
	Williams NGL & Petchem Services	(5		)	(100		)
	Other	—			58
		812			666
	Accretion expense associated with asset retirement obligations for nonregulated operations	(6		)	(3		)
	Depreciation and amortization expenses	(427		)	(214		)
	Equity earnings (losses)	51			(48		)
	Other investing income (loss) – net	—			14
	Proportional Modified EBITDA of equity-method investments	(136		)	(28		)
	Interest expense	(251		)	(140		)
	(Provision) benefit for income taxes	(30		)	(51		)
	Net income (loss)	$	13		$	196

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Note 14 – Subsequent Events
	On April 6, 2015, WPZ announced its agreement to acquire an additional 21 percent equity interest in UEOM for approximately $575 million, subject to the right of the other member of UEOM to participate in the transaction. If the other member exercises this right, WPZ would acquire an approximate 13 percent interest and the other member would acquire an approximate 8 percent interest.
	On April 15, 2015, WPZ redeemed $750 million of 5.875 percent senior notes due 2021. (See Note 9 – Debt and Banking Arrangements.)

Acquisition_Tables

Acquisition (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following table presents the allocation of the acquisition-date fair value of the major classes of the assets acquired, which are presented in the Williams Partners segment, liabilities assumed, and noncontrolling interest at July 1, 2014. Changes since the preliminary allocation disclosed in our Annual Report on Form 10-K for the year ended December 31, 2014 reflect an increase of $150 million in property, plant and equipment – net and $25 million in goodwill, and a decrease of $168 million in other intangible assets and $7 million in investments. These adjustments during the measurement period were not considered significant to require retrospective revisions of our financial statements.
		(Millions)
	Accounts receivable	$	168
	Other current assets	63
	Investments	5,865
	Property, plant, and equipment – net	7,165
	Goodwill	499
	Other intangible assets	8,841
	Current liabilities	(408		)
	Debt	(4,052		)
	Other noncurrent liabilities	(9		)
	Noncontrolling interest in ACMP’s subsidiaries	(958		)
	Noncontrolling interest in ACMP	(6,544		)

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2015
Variable Interest Entity Disclosures [Abstract]
Schedule of Variable Interest Entities [Table Text Block]	The following table presents amounts included in our Consolidated Balance Sheet that are for the use or obligation of our consolidated VIEs.
		March 31,			31-Dec-14			Classification
		2015
		(Millions)
	Assets (liabilities):
	Cash and cash equivalents	$	58		$	113		Cash and cash equivalents
	Accounts receivable	71			52			Accounts and notes receivable, net – Trade and other
	Other current assets	3			3			Other current assets and deferred charges
	Property, plant and equipment, net	2,877			2,794			Property, plant and equipment – net
	Goodwill	107			103			Goodwill
	Other intangible assets, net	1,474			1,493			Other intangible assets, net of accumulated amortization
	Other noncurrent assets	3			14			Regulatory assets, deferred charges, and other
	Accounts payable	(40		)	(48		)	Accounts payable
	Accrued liabilities	(36		)	(36		)	Accrued liabilities
	Current deferred revenue	(45		)	(45		)	Accrued liabilities
	Noncurrent deferred income taxes	—			(13		)	Deferred income taxes
	Asset retirement obligation	(94		)	(94		)	Other noncurrent liabilities
	Noncurrent deferred revenue associated with customer advance payments	(389		)	(395		)	Other noncurrent liabilities

Provision_Benefit_for_Income_T1

Provision (Benefit) for Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Provision (benefit) for income taxes from continuing operations	The Provision (benefit) for income taxes includes:
		Three months ended
		March 31,
		2015		2014
		(Millions)
	Current:
	Federal	$	—	$	137
	State	—		5
	Foreign	2		2
		2		144
	Deferred:
	Federal	25		(96		)
	State	3		(1		)
	Foreign	—		4
		28		(93		)
	Total provision (benefit)	$	30	$	51

Earnings_Loss_Per_Common_Share1

Earnings (Loss) Per Common Share from Continuing Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings (loss) per common share from continuing operations	Note 6 – Earnings (Loss) Per Common Share
		Three months ended
		March 31,
		2015		2014
		(Dollars in millions, except per-share
		amounts; shares in thousands)
	Net income (loss) attributable to The Williams Companies, Inc. available to common stockholders for basic and diluted earnings (loss) per common share	$	70	$	140
	Basic weighted-average shares	748,079		684,773
	Effect of dilutive securities:
	Nonvested restricted stock units	2,217		2,096
	Stock options	1,715		2,017
	Convertible debentures	17		18
	Diluted weighted-average shares	752,028		688,904
	Net income (loss) per common share:
	Basic	$	0.09	$	0.2
	Diluted	$	0.09	$	0.2

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost (credit) is as follows:
		Pension Benefits
		Three months ended
		March 31,
		2015			2014
		(Millions)
	Components of net periodic benefit cost:
	Service cost	$	14		$	10
	Interest cost	15			16
	Expected return on plan assets	(19		)	(19		)
	Amortization of net actuarial loss	11			9
	Net periodic benefit cost	$	21		$	16
		Other Postretirement Benefits
		Three months ended
		March 31,
		2015			2014
		(Millions)
	Components of net periodic benefit cost (credit):
	Service cost	$	1		$	1
	Interest cost	2			2
	Expected return on plan assets	(3		)	(3		)
	Amortization of prior service credit	(4		)	(5		)
	Reclassification to regulatory liability	1			1
	Net periodic benefit cost (credit)	$	(3	)	$	(4	)

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory, Net [Abstract]
Inventories
		March 31,		December 31,
		2015		2014
		(Millions)
	Natural gas liquids, olefins, and natural gas in underground storage	$	122	$	150
	Materials, supplies, and other	78		81
		$	200	$	231

Debt_and_Banking_Arrangements_

Debt and Banking Arrangements Debt and Banking Arrangements (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Line of Credit Facilities [Table Text Block]	Credit Facilities
	On February 2, 2015, we entered into a Credit Agreement with aggregate commitments remaining at $1.5 billion, and the credit facilities for Pre-merger WPZ and ACMP were terminated in connection with the Merger. WPZ also entered into a $3.5 billion credit facility.
		31-Mar-15
		Stated Capacity		Outstanding
		(Millions)
	WMB
	Loans	$	1,500	$	375
	Swingline loans sublimit	50		—
	Letters of credit sublimit	675		—
	Letters of credit under certain bilateral bank agreements			15
	WPZ
	Loans	3,500		—
	Swingline loans sublimit	150		—
	Letters of credit sublimit	1,125		2
	Letters of credit under certain bilateral bank agreements			3

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table presents the changes in Accumulated other comprehensive income (loss) by component, net of income taxes:
		Cash				Foreign			Pension and			Total
		Flow				Currency			Other Post
		Hedges				Translation			Retirement
									Benefits
		(Millions)
	Balance at December 31, 2014	$	(1	)		$	31		$	(371	)	$	(341	)
	Other comprehensive income (loss) before reclassifications	—				(60		)	—			(60		)
	Amounts reclassified from accumulated other comprehensive income (loss)	—				—			6			6
	Other comprehensive income (loss)	—				(60		)	6			(54		)
	Balance at March 31, 2015	$	(1	)		$	(29	)	$	(365	)	$	(395	)
Reclassifications Out Of Accumulated Other Comprehensive Income [Table Text Block]	Reclassifications out of Accumulated other comprehensive income (loss) are presented in the following table by
	component for the three months ended March 31, 2015:
	Component		Reclassifications				Classification
			(Millions)
	Pension and other postretirement benefits:
	Amortization of prior service cost (credit) included in net periodic benefit cost		$	(2	)		Note 7 – Employee Benefit Plans
	Amortization of actuarial (gain) loss included in net periodic benefit cost		11				Note 7 – Employee Benefit Plans
	Total pension and other postretirement benefits, before income taxes		9
	Income tax benefit		(3		)		Provision (benefit) for income taxes
	Reclassifications during the period		$	6

Fair_Value_Measurements_and_Gu1

Fair Value Measurements and Guarantees (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Assets and Liabilities Measured On Recurring Basis [Text Block]
								Fair Value Measurements Using
		Carrying			Fair			Quoted		Significant			Significant
		Amount			Value			Prices In		Other			Unobservable
								Active		Observable			Inputs
								Markets for		Inputs			(Level 3)
								Identical		(Level 2)
								Assets
								(Level 1)
		(Millions)
	Assets (liabilities) at March 31, 2015:
	Measured on a recurring basis:
	ARO Trust investments	$	60		$	60		$	60	$	—		$	—
	Energy derivatives assets not designated as hedging instruments	2			2			—		—			2
	Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
	Additional disclosures:
	Notes receivable and other	13			16			1		3			12
	Long-term debt, including current portion (1)	(22,487		)	(23,003		)	—		(23,003		)	—
	Guarantee	(30		)	(25		)	—		(25		)	—
	Assets (liabilities) at December 31, 2014:
	Measured on a recurring basis:
	ARO Trust investments	$	48		$	48		$	48	$	—		$	—
	Energy derivatives assets not designated as hedging instruments	3			3			1		—			2
	Energy derivatives liabilities not designated as hedging instruments	(2		)	(2		)	—		—			(2		)
	Additional disclosures:
	Notes receivable and other	30			57			—		4			53
	Long-term debt, including current portion (1)	(20,887		)	(21,131		)	—		(21,131		)	—
	Guarantee	(31		)	(27		)	—		(27		)	—
	___________________________________
	(1) Excludes capital leases

Segment_Disclosures_Tables

Segment Disclosures (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	The following table reflects the reconciliation of Segment revenues to Total revenues as reported in the Consolidated Statement of Income and Total assets by reportable segment.
		Williams			Williams			Other		Eliminations			Total
		Partners			NGL & Petchem
					Services (1)
		(Millions)
	Three months ended March 31, 2015
	Segment revenues:
	Service revenues
	External	$	1,192		$	—		$	5	$	—		$	1,197
	Internal	—			—			21		(21		)	—
	Total service revenues	1,192			—			26		(21		)	1,197
	Product sales
	External	519			—			—		—			519
	Internal	—			—			—		—			—
	Total product sales	519			—			—		—			519
	Total revenues	$	1,711		$	—		$	26	$	(21	)	$	1,716
	Three months ended March 31, 2014
	Segment revenues:
	Service revenues
	External	$	763		$	—		$	56	$	—		$	819
	Internal	—			—			3		(3		)	—
	Total service revenues	763			—			59		(3		)	819
	Product sales
	External	930			—			—		—			930
	Internal	—			—			—		—			—
	Total product sales	930			—			—		—			930
	Total revenues	$	1,693		$	—		$	59	$	(3	)	$	1,749
	March 31, 2015
	Total assets	$	49,284		$	656		$	1,101	$	(584	)	$	50,457
	December 31, 2014
	Total assets	$	49,322		$	612		$	1,220	$	(591	)	$	50,563
Reconciliation of Modified EBITDA to Segment to Consolidated [Table Text Block]	The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Income.
		Three months ended March 31,
		2015			2014
		(Millions)
	Modified EBITDA by Segment:
	Williams Partners	$	817		$	708
	Williams NGL & Petchem Services	(5		)	(100		)
	Other	—			58
		812			666
	Accretion expense associated with asset retirement obligations for nonregulated operations	(6		)	(3		)
	Depreciation and amortization expenses	(427		)	(214		)
	Equity earnings (losses)	51			(48		)
	Other investing income (loss) – net	—			14
	Proportional Modified EBITDA of equity-method investments	(136		)	(28		)
	Interest expense	(251		)	(140		)
	(Provision) benefit for income taxes	(30		)	(51		)
	Net income (loss)	$	13		$	196

General_Description_of_Busines1

General, Description of Business, and Basis of Presentation (Details) (USD $)	3 Months Ended	2 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2015	Feb. 02, 2015
Schedule of Equity Method Investments [Line Items]
Number Of Interstate Natural Gas Pipelines	2
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	($97)
Constitution Pipeline Company LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage	41.00%
General and Limited Partner [Member] | Williams Partners L. P. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Master limited partnership, ownership percentage	60.00%
General and Limited Partner [Member] | Williams Partners L. P. [Member] | Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Master limited partnership, ownership percentage		60.00%
ACMP Units Into Merged Partnership Units [Member] | Williams Partners L. P. [Member] | Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion Ratio			1.06152
Publicly Held WPZ Common Units into ACMP Common Units [Member] | Williams Partners L. P. [Member] | Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion Ratio			0.86672
Privately Held WPZ Units Into ACMP Common Units [Member] | Williams Partners L. P. [Member] | Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion Ratio			0.80036
Class D WPZ Units Into WPZ Common Units [Member] | Williams Partners L. P. [Member] | Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion Ratio			1
Capital in Excess of Par Value
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	163
Noncontrolling Interest [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	-260
Deferred Income Taxes [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Income Tax Effects Allocated Directly to Equity, Other	$97
Gulfstream Natural Gas System, L.L.C.[Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Utica East Ohio Midstream, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%	49.00%
Delaware Basin Gas Gathering System [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Laurel Mountain Midstream, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	69.00%	69.00%
Caiman Energy II [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	58.00%	58.00%
Discovery Producer Services LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	60.00%	60.00%
Overland Pass Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Appalachia Midstream Services, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	45.00%	45.00%
Number of Gathering Systems	11

Acquisition_Details

Acquisition (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jul. 01, 2014
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment	$150
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill [Line Items]	25
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	-168
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investments	-7
Business Acquisition, Purchase Price Allocation [Abstract]
Goodwill	1,145	1,120
Williams Partners [Member] | Access Midstream Partners Acquisition [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Accounts receivable			168
Other current assets			63
Investments			5,865
Property, plant and equipment - net			7,165
Goodwill			499
Other intangible assets			8,841
Current liabilities			-408
Debt			-4,052
Other noncurrent liabilities			-9
Williams Partners [Member] | Access Midstream Partners Acquisition [Member] | ACMP's subsidiaries [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Noncontrolling Interest			-958
Williams Partners [Member] | Access Midstream Partners Acquisition [Member] | Access Midstream Partners Lp [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Noncontrolling Interest			($6,544)

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Constitution Pipeline Company Llc [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	41.00%
Variable Interest Entity, Primary Beneficiary [Member] | Cash and Cash Equivalents [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	58	$113
Variable Interest Entity, Primary Beneficiary [Member] | Accounts Receivable [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	71	52
Variable Interest Entity, Primary Beneficiary [Member] | Other Current Assets [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	3	3
Variable Interest Entity, Primary Beneficiary [Member] | Property Plant And Equipment, net [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	2,877	2,794
Variable Interest Entity, Primary Beneficiary [Member] | Goodwill [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	107	103
Variable Interest Entity, Primary Beneficiary [Member] | Other Intangible Assets, net [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	1,474	1,493
Variable Interest Entity, Primary Beneficiary [Member] | Other Noncurrent Assets [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	3	14
Variable Interest Entity, Primary Beneficiary [Member] | Accounts Payable [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	-40	-48
Variable Interest Entity, Primary Beneficiary [Member] | Accrued Liabilities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	-36	-36
Variable Interest Entity, Primary Beneficiary [Member] | Current deferred revenue [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	-45	-45
Variable Interest Entity, Primary Beneficiary [Member] | Noncurrent Deferred Income Taxes [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	-13
Variable Interest Entity, Primary Beneficiary [Member] | Asset Retirement Obligation [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	-94	-94
Variable Interest Entity, Primary Beneficiary [Member] | Noncurrent deferred revenue associated with customer advance payments [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	-389	-395
Variable Interest Entity, Primary Beneficiary [Member] | Gulfstar One [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	51.00%
Variable Interest Entity, Primary Beneficiary [Member] | Gulfstar One [Member] | Estimated Remaining Construction Costs For Variable Interest Entity [Member]
Variable Interest Entity [Line Items]
Other commitment	116
Variable Interest Entity, Primary Beneficiary [Member] | Constitution Pipeline Company Llc [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	41.00%
Variable Interest Entity, Primary Beneficiary [Member] | Constitution Pipeline Company Llc [Member] | Estimated Remaining Construction Costs For Variable Interest Entity [Member]
Variable Interest Entity [Line Items]
Other commitment	604
Variable Interest Entity, Primary Beneficiary [Member] | Cardinal Gas Services LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	66.00%
Variable Interest Entity, Primary Beneficiary [Member] | Jackalope Gas Gathering Services LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	50.00%

Other_Income_and_Expenses_Deta

Other Income and Expenses (Details) (USD $)	3 Months Ended		1 Months Ended	23 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015	Apr. 30, 2015
Segment Reporting Information [Line Items]
Equity earnings (losses)	$51	($48)
Williams Partners [Member]
Segment Reporting Information [Line Items]
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	17	3
Employee costs [Member] | Williams Partners [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Business Combination, Integration Related Costs	4
Employee costs [Member] | Williams Partners [Member] | Operation and maintenance [Member]
Segment Reporting Information [Line Items]
Business Combination, Integration Related Costs	4
Merger [Member] | Williams Partners [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Business Combination, Integration Related Costs	25
Other Restructuring [Member] | Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Business Combination, Integration Related Costs	6
Former Venezuela Operations [Member]
Segment Reporting Information [Line Items]
Investment Income, Interest	0	13
Bluegrass Pipeline Company Llc [Member] | Williams NGL & Petchem Services [Member]
Segment Reporting Information [Line Items]
Equity earnings (losses)		-70
Project Development Costs		19
Geismar Incident [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurable Expenses in Excess of our Deductibles		6
Insurance recoveries		125
Geismar Incident [Member] | Property Damage And Business Interruption [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	500
Geismar Incident [Member] | Property Damage [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	10
Geismar Incident [Member] | Business Interruption [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Duration of waiting period before business interrutpion coverage begins	60 days
Geismar Incident [Member] | General Liability [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	610
Insurance deductibles	2
Geismar Incident [Member] | Workers Compensation [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	1
Subsequent Event [Member] | Geismar Incident [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance recoveries			126
Subsequent Event [Member] | Geismar Incident [Member] | Property Damage And Business Interruption [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount			480	480
Remaining insurance recoverable amount			20	20
Insurance recoveries				$422

Provision_Benefit_for_Income_T2

Provision (Benefit) for Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Tax Contingency [Line Items]
Provision For Adjustment To Prior Year Taxable Foreign Income	$14
Current :
Federal	0	137
State	0	5
Foreign	2	2
Total	2	144
Deferred:
Federal	25	-96
State	3	-1
Foreign	0	4
Total	28	-93
Total provision (benefit)	$30	$51

Earnings_Loss_Per_Common_Share2

Earnings (Loss) Per Common Share from Continuing Operations (Details) (USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings (loss) per common share from continuing operations
Net Income (Loss) Attributable to Parent	$70	$140
Basic weighted-average shares	748,079	684,773
Diluted weighted-average shares	752,028	688,904
Earnings (loss) per common share from continuing operations:
Earnings Per Share, Basic	$0.09	$0.20
Earnings Per Share, Diluted	$0.09	$0.20
Nonvested restricted stock units [Member]
Effect of dilutive securities:
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item	2,217	2,096
Stock options [Member]
Effect of dilutive securities:
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item	1,715	2,017
Convertible debentures [Member]
Effect of dilutive securities:
Incremental dilutive shares, Convertible debt	17	18

Employee_Benefit_Plans_Quarter

Employee Benefit Plans (Quarterly Info) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits [Member]
Components of net periodic benefit cost:
Service cost	$14	$10
Interest cost	15	16
Expected return on plan assets	-19	-19
Amortization of net actuarial loss	11	9
Net periodic benefit cost (credit)	21	16
Employer contributions	16
Estimated future employer contributions in current fiscal year	47
Other Postretirement Benefits [Member]
Components of net periodic benefit cost:
Service cost	1	1
Interest cost	2	2
Expected return on plan assets	-3	-3
Amortization of prior service cost (credit)	-4	-5
Reclassification to regulatory liability	1	1
Net periodic benefit cost (credit)	-3	-4
Amortization of prior service cost (credit) from regulatory assets (liabilities)	-2	-3
Employer contributions	1
Estimated future employer contributions in current fiscal year	$6

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventory, Net [Abstract]
Natural gas liquids, olefins, and natural gas in underground storage	$122	$150
Materials, supplies, and other	78	81
Inventories, Total	$200	$231

LongTerm_Debt_Issuances_and_Re

Long-Term Debt Issuances and Retirements (Details 1) (USD $)	3 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 15, 2015	Feb. 15, 2015	Mar. 03, 2015
Debt Instrument [Line Items]
Payments of long-term debt	$3,648	$0
3.6% Senior Unsecured Notes due 2022 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount					1,250
Long-term debt interest rate					3.60%
4% Senior Unsecured Notes due 2025 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount					750
Long-term debt interest rate					4.00%
5.1% Senior Unsecured Notes due 2045 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount					1,000
Long-term debt interest rate					5.10%
5.875% Senior Unsecured Notes due 2021 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt due within one year	798
5.875% Senior Unsecured Notes due 2021 [Member] | Williams Partners L.P. [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt interest rate			5.88%
Payments of long-term debt			783
Long-term debt retired			750
3.8% Senior Unsecured Notes due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt interest rate				3.80%
Long-term debt retired				$750

Credit_Facilities_and_Commerci

Credit Facilities and Commercial Paper (Details 2) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 03, 2015	Apr. 29, 2015
In Millions, unless otherwise specified
Credit Facility and Commercial Paper [Line Items]
Commercial paper, outstanding	$0	$798
Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	1,500
Credit facility, loans outstanding	375
Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	3,500
Credit facility, loans outstanding	0
Letter of Credit [Member] | Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	675
Credit facility, letters of credit outstanding	0
Letter of Credit [Member] | Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	1,125
Credit facility, letters of credit outstanding	2
Letters Of Credit Under Certain Bilateral Bank Agreements [Member] | Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, letters of credit outstanding	15
Letters Of Credit Under Certain Bilateral Bank Agreements [Member] | Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, letters of credit outstanding	3
Swingline Loan [Member] | Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	50
Credit facility, swingline loans outstanding	0
Swingline Loan [Member] | Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	150
Credit facility, swingline loans outstanding	0
Short-term facility [Member] | Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity			1,500
Credit facility, loans outstanding			0
Subsequent Event [Member] | Commercial Paper [Member] | Williams Partners L.P. [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity				3,000
Commercial paper, outstanding				$521

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity (Textuals) [Abstract]
Proceeds from issuance of common stock	$10	$14
Statement [Line Items]
Total, Beginning Balance	-341
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-60
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Other comprehensive income (loss)	-89	-39
Total, Ending Balance	-395
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Product sales	519	930
Reclassifications before income tax	-43	-247
Provision (benefit) for income taxes	-30	-51
Reclassification out of Accumulated Other Comprehensive Income [Member]
Statement [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Provision (benefit) for income taxes	-3
Cash flow hedging activities [Member]
Statement [Line Items]
Total, Beginning Balance	-1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive income (loss)	0
Total, Ending Balance	-1
Foreign currency translation [Member]
Statement [Line Items]
Total, Beginning Balance	31
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-60
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive income (loss)	-60
Total, Ending Balance	-29
Accumulated Other Comprehensive Income (Loss) [Member]
Statement [Line Items]
Other comprehensive income (loss)	-54
Pension and other postretirement benefits [Member]
Statement [Line Items]
Total, Beginning Balance	-371
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6
Other comprehensive income (loss)	6
Total, Ending Balance	-365
Pension and other postretirement benefits [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Amortization of prior service cost (credit) included in net periodic benefit cost	-2
Amortization of actuarial (gain) loss included in net periodic benefit cost	11
Reclassifications before income tax	9
Parent [Member]
Statement [Line Items]
Other comprehensive income (loss)	($54)

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
In Millions, unless otherwise specified
Additional disclosure:
Fair Value, Level 1 to level 2 Transfers, Amount	$0		$0
Fair Value, Level 2 to level 1 Transfers, Amount	0		0
Carrying Amount [Member]
Additional disclosure:
Notes receivable and other	13			30
Long-term debt, including current portion	-22,487	[1]		-20,887	[1]
Guarantee	-30			-31
Carrying Amount [Member] | Former Venezuela Operations [Member]
Additional disclosure:
Notes Receivable, Fair Value Disclosure	8
Fair Value [Member]
Additional disclosure:
Notes receivable and other	16			57
Long-term debt, including current portion	-23,003	[1]		-21,131	[1]
Guarantee	-25			-27
Fair Value [Member] | Former Venezuela Operations [Member]
Additional disclosure:
Notes Receivable, Fair Value Disclosure	12
Level 1 [Member]
Additional disclosure:
Notes receivable and other	1			0
Long-term debt, including current portion	0	[1]		0	[1]
Guarantee	0			0
Level 2 [Member]
Additional disclosure:
Notes receivable and other	3			4
Long-term debt, including current portion	-23,003	[1]		-21,131	[1]
Guarantee	-25			-27
Level 3 [Member]
Additional disclosure:
Notes receivable and other	12			53
Long-term debt, including current portion	0	[1]		0	[1]
Guarantee	0			0
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Measured on a recurring basis:
ARO Trust investments	60			48
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member] | Not Designated as Hedging Instrument [Member]
Measured on a recurring basis:
Energy derivatives assets	2			3
Energy derivative liabilities	-2			-2
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Measured on a recurring basis:
ARO Trust investments	60			48
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Not Designated as Hedging Instrument [Member]
Measured on a recurring basis:
Energy derivatives assets	2			3
Energy derivative liabilities	-2			-2
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Measured on a recurring basis:
ARO Trust investments	60			48
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Not Designated as Hedging Instrument [Member]
Measured on a recurring basis:
Energy derivatives assets	0			1
Energy derivative liabilities	0			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Measured on a recurring basis:
ARO Trust investments	0			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member]
Measured on a recurring basis:
Energy derivatives assets	0			0
Energy derivative liabilities	0			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Measured on a recurring basis:
ARO Trust investments	0			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Not Designated as Hedging Instrument [Member]
Measured on a recurring basis:
Energy derivatives assets	2			2
Energy derivative liabilities	($2)			($2)
[1]	Excludes capital leases

Guarantees_Details

Guarantees (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Wiltel Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$34
Wpx Energy Inc [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$39

Contingent_Liabilities_Details

Contingent Liabilities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	$43,000,000
Geismar Incident [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	45,000,000
Former Alaska Refinery [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	32,000,000
Former Operations
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	25,000,000
Natural gas underground storage facilities
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	8,000,000
Environmental Protection Agency [Member]
Loss Contingencies [Line Items]
Accrued Environmental Loss liabilities	10,000,000
Williams Partners [Member] | General Liability [Member] | Geismar Incident [Member]
Loss Contingencies [Line Items]
Aggregate Annual Limit of Insurance	610,000,000
Insurance deductibles	$2,000,000

Segment_Disclosures_Details_1

Segment Disclosures (Details 1) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment revenues:
Revenues	$1,716	$1,749
Total assets by reporting segment
Total assets	50,457		50,563
Reconciliation of Modified EBITDA to net income (loss):
Modified Ebitda	812	666
Accretion expense associated with asset retirement obligations for nonregulated operations	-6	-3
Depreciation and amortization expenses	-427	-214
Equity earnings (losses)	51	-48
Other investing income (loss) - net	0	14
Proportional Modified Ebitda Equity Method Investments	-136	-28
Interest Expense	-251	-140
(Provision) benefit for income taxes	-30	-51
Net income (loss)	13	196
Service [Member]
Segment revenues:
Revenues	1,197	819
Product [Member]
Segment revenues:
Revenues	519	930
Williams Partners [Member]
Total assets by reporting segment
Total assets	49,284		49,322
Reconciliation of Modified EBITDA to net income (loss):
Modified Ebitda	817	708
Williams Partners [Member] | Service [Member]
Segment revenues:
Revenues	1,192	763
Williams Partners [Member] | Product [Member]
Segment revenues:
Revenues	519	930
Williams NGL & Petchem Services [Member]
Total assets by reporting segment
Total assets	656		612
Reconciliation of Modified EBITDA to net income (loss):
Modified Ebitda	-5	-100
Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Revenues	0	0
Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Other [Member]
Total assets by reporting segment
Total assets	1,101		1,220
Reconciliation of Modified EBITDA to net income (loss):
Modified Ebitda	0	58
Other [Member] | Service [Member]
Segment revenues:
Revenues	5	56
Other [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Operating Segments [Member] | Williams Partners [Member]
Segment revenues:
Revenues	1,711	1,693
Operating Segments [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Revenues	1,192	763
Operating Segments [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Revenues	519	930
Operating Segments [Member] | Williams NGL & Petchem Services [Member]
Segment revenues:
Revenues	0	0
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Revenues	0	0
Operating Segments [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Operating Segments [Member] | Other [Member]
Segment revenues:
Revenues	26	59
Operating Segments [Member] | Other [Member] | Service [Member]
Segment revenues:
Revenues	26	59
Operating Segments [Member] | Other [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member]
Segment revenues:
Revenues	-21	-3
Total assets by reporting segment
Total assets	-584		-591
Intersegment Elimination [Member] | Service [Member]
Segment revenues:
Revenues	-21	-3
Intersegment Elimination [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Service [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member] | Williams Partners [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Service [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member] | Williams NGL & Petchem Services [Member] | Product [Member]
Segment revenues:
Revenues	0	0
Intersegment Elimination [Member] | Other [Member] | Service [Member]
Segment revenues:
Revenues	-21	-3
Intersegment Elimination [Member] | Other [Member] | Product [Member]
Segment revenues:
Revenues	$0	$0

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended		0 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 15, 2015	Apr. 30, 2015	Apr. 06, 2015
Subsequent Event [Line Items]
Payments to Acquire Equity Method Investments	$83	$228
5.875% Senior Unsecured Notes due 2021 [Member] | Williams Partners L.P. [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term debt retired			750
Long-term debt interest rate			5.88%
Utica East Ohio Midstream, LLC [Member]
Subsequent Event [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Utica East Ohio Midstream, LLC [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Equity Method Investments				$575
Utica East Ohio Midstream, LLC [Member] | Subsequent Event [Member] | Percentage To Be Acquired By Us Without Participation By Another [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					21.00%
Utica East Ohio Midstream, LLC [Member] | Subsequent Event [Member] | Percentage To Be Acquired By Us With Participation By Another [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					13.00%
Utica East Ohio Midstream, LLC [Member] | Subsequent Event [Member] | Percentage To Be Acquired By Another If Participation Right Is Exercised [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					8.00%