The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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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.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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General, Description of Business, and Basis of Presentation (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended				3 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended						1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Noncontrolling Interest [Member]	Jun. 30, 2014 Capital in excess of par value [Member]	Jun. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2014 Canada Acquisition [Member]	Jun. 30, 2014 Canada Acquisition [Member]	Feb. 28, 2014 General Partner [Member]	Jun. 30, 2014 General and Limited Partner [Member]	Jun. 30, 2014 Williams Partners L.P. Noncontrolling Interest [Member]	Jun. 30, 2014 Williams Partners L.P. Deferred Income Taxes [Member]	Jun. 30, 2014 Williams Partners L.P. Capital in excess of par value [Member]	Jun. 30, 2014 Williams Partners L.P. Accumulated Other Comprehensive Income (Loss) [Member]	Jun. 30, 2014 Constitution Pipeline Company LLC [Member]	Feb. 28, 2014 Class D Units [Member] Canada Acquisition [Member]	Jun. 30, 2014 Class D Units [Member] Canada Acquisition [Member] Future Facility Expansion [Member]	Jun. 30, 2014 Gulfstream Natural Gas System, L.L.C.[Member]	Jun. 30, 2014 Access Midstream Partners, GP, L.L.C.[Member]	Jun. 30, 2014 Access Midstream Partners Lp [Member]	Jun. 30, 2014 Bluegrass Pipeline Company Llc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																50.00%	50.00%	23.00%	50.00%
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage													41.00%
Master limited partnership, ownership percentage								66.00%
Proceeds from Divestiture of Businesses					$ 31	$ 56
Number Of Limited Partner Units Received														25,577,521	0
Other commitment															200
General partner ownership percentage							2.00%
Changes in ownership of consolidated subsidiaries	$ (47)	$ (146)	$ 79	$ 20					$ 146	$ (47)	$ (79)	$ (20)