Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Balance Type:	na
Period Type:	instant

- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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Balance Type:	credit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Number of limited partner units received for contributing a business to a consolidated master limited partnership.

+ References

No definition available.

+ Details

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Namespace Prefix:	wmb_
Data Type:	xbrli:sharesItemType
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Subsequent Events (Details) (Access Midstream Partners Acquisition [Member], USD $)		6 Months Ended
	Jun. 30, 2014 General Partner [Member]	Jul. 01, 2014 Subsequent Event [Member]	Jul. 01, 2014 Subsequent Event [Member] Minimum [Member]	Jul. 01, 2014 Subsequent Event [Member] Maximum [Member]	Jul. 01, 2014 Subsequent Event [Member] Limited Partner [Member]	Jul. 01, 2014 Subsequent Event [Member] General Partner [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						50.00%
Number Of Limited Partner Units Received		55,100,000
Payments to Acquire Businesses, Gross		$ 5,995,000,000
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions					50.00%	100.00%
Equity Method Investment, Ownership Percentage	50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			$ 2,500,000,000	$ 3,000,000,000