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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 18

-Subparagraph (c)

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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)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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

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Duration of waiting period before business interrutpion coverage begins

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

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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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Asset Sales and Other Accruals (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Williams Partners [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Insurance recoveries	$ 125
Insurable Expenses in Excess of our Deductibles	6
Williams Partners [Member] \| Property Damage And Business Interruption [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	500
Williams Partners [Member] \| Property Damage [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	10
Williams Partners [Member] \| Business Interruption [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Duration of waiting period before business interrutpion coverage begins	60 days
Williams Partners [Member] \| General Liability [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	2
Maximum insurance recoverable amount	610
Williams Partners [Member] \| Workers Compensation [Member] \| Geismar Incident [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	1
Former Venezuela Operations [Member]
Segment Reporting Information [Line Items]
Investment Income, Interest	13	13
Access Midstream Partners Lp [Member]
Segment Reporting Information [Line Items]
Percent interest in equity method investment	23.00%
Bluegrass Pipeline Company Llc [Member]
Segment Reporting Information [Line Items]
Percent interest in equity method investment	50.00%
Project Development Costs	$ 19