The expense charged against earnings during the period to allocate the capitalized costs of regulatory assets over the periods expected to benefit from such costs.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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

-Publisher FASB

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 18

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Amount of gain (loss) on sale or disposal of an equity method investment.

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No definition available.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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-Publisher FASB

-Name Accounting Standards Codification

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 03

-Paragraph 7

-Article 5

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- Definition

Duration of waiting period before business interrutpion coverage begins

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No definition available.

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Insurable Expenses in Excess of our Deductibles included in other (income) expense - net.

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No definition available.

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Insurance deductibles included in operating expense

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Amount of risk retained by the entity before the insurance arrangement begins to provide coverage

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Maximum amount recoverable under various insurance policies.

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Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 4	$ 25	$ 4	$ 24
Williams Partners [Member]
Segment Reporting Information [Line Items]
Impairment of certain equipment held for sale	17	0	17	0
Amortization of Regulatory Asset	8	5	17	7
Access Midstream Partners [Member] \| Access Midstream Partners Acquisition [Member]
Segment Reporting Information [Line Items]
Acquisition related costs	11		11
Access Midstream Partners [Member] \| Access Midstream Partners Acquisition [Member] \| Interest incurred [Member]
Segment Reporting Information [Line Items]
Acquisition related costs	9		9
Access Midstream Partners [Member] \| Access Midstream Partners Acquisition [Member] \| Selling, General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Acquisition related costs	2		2
Former Venezuela Operations [Member]
Segment Reporting Information [Line Items]
Investment Income, Interest	14	13	27	26
Asset Impairment for Regulatory Action - Eminence abandonment [Member] \| Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance recoveries	0	(12)	0	(12)
Write-off of the Eminence abandonment regulatory asset not recoverable through rates	0	6	0	6
Bluegrass Pipeline Company Llc [Member] \| Williams NGL & Petchem Services [Member]
Segment Reporting Information [Line Items]
Project Development Costs			19
Access Midstream Partners [Member] \| Access Midstream Partners [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	4	26	4	26
Geismar Incident [Member] \| Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance recoveries	(50)		(175)
Insurable Expenses in Excess of our Deductibles	8		14
Insurance deductible expense		6		6
Geismar Incident [Member] \| Property Damage And Business Interruption [Member] \| Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	500		500
Geismar Incident [Member] \| Property Damage [Member] \| Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	10		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		610
Insurance deductibles	2		2
Geismar Incident [Member] \| Workers Compensation [Member] \| Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	$ 1		$ 1