Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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General, Description of Business, and Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended		6 Months Ended
	Sep. 28, 2015	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Number Of Interstate Natural Gas Pipelines							2
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common Stock, Dividends, Per Share, Declared					$ 0.64	$ 0.59	$ 1.28	$ 1.17
Assets					$ 48,124		$ 48,124		$ 49,020
ETC Merger [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.10
WPZ Merger Agreement [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Termination Fee	$ 428
Maximum Reduction Of Quarterly Incentive Distributions	$ 209
Reduction in incentive distribution rights payment		$ 10	$ 209	$ 209
Constitution Pipeline Company LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage							41.00%
Appalachia Midstream Services, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest							45.00%
General and Limited Partner [Member] \| Williams Partners L. P. [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage							60.00%
Gulfstream Natural Gas System, L.L.C.[Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					50.00%		50.00%
Utica East Ohio Midstream, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					62.00%		62.00%
Delaware Basin Gas Gathering System [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					50.00%		50.00%
Laurel Mountain Midstream, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					69.00%		69.00%
Caiman Energy II [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					58.00%		58.00%
Discovery Producer Services LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					60.00%		60.00%
Overland Pass Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage					50.00%		50.00%
Regional Asset Group [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Assets					$ 1,600		$ 1,600