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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- References

No definition available.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

Name:	us-gaap_RegulatoryAssetsNoncurrent
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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amortization Period Of Difference Between Expected And Actual Return On Plan Assets for calculation of market-related value of plan assets

No definition available.

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Amortization period of net actuarial gain (loss) which is approximately the participants' average remaining future years of service.

No definition available.

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Approximate Amortization Period Of Unrecognized Prior Service Costs Credits

No definition available.

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Minimum period of construction for capitalization of interest.

No definition available.

Name:	wmb_MinimumPeriodOfConstructionForCapitalizationOfInterest
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Minimum total project cost for capitalization of interest.

No definition available.

Name:	wmb_MinimumTotalProjectCostForCapitalizationOfInterest
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Threshold For Amortization Of Unrecognized Actuarial Gains Losses, stated as a percentage of the greater of the benefit obligation or the market-related value of plan assets.

No definition available.

Name:	wmb_ThresholdForAmortizationOfUnrecognizedActuarialGainsLosses
Namespace Prefix:	wmb_
Data Type:	num:percentItemType
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Threshold For Market Related Value stated as a percentage of the fair value of plan assets as measured at the beginning of the year

No definition available.

Name:	wmb_ThresholdForMarketRelatedValue
Namespace Prefix:	wmb_
Data Type:	num:percentItemType
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