Acquisitions and Discontinued Operations (Details) (USD $)	9 Months Ended				9 Months Ended			9 Months Ended		9 Months Ended
	Sep. 30, 2012 mi	Sep. 30, 2011	Sep. 30, 2012 El Paso Midstream Investment Company, LLC. [Member]	Jun. 04, 2012 El Paso Midstream Investment Company, LLC. [Member]	Sep. 30, 2012 El Paso Natural Gas Company [Member] mi Bcf	Sep. 30, 2012 KMI Asset Drop Down [Member] Bcf	Aug. 01, 2012 KMI Asset Drop Down [Member]	Sep. 30, 2012 Tennessee Gas natural gas pipeline [Member] Bcf mi	Aug. 01, 2012 Tennessee Gas natural gas pipeline [Member]	Sep. 30, 2012 Common Unit [Member] El Paso Midstream Investment Company, LLC. [Member]	Sep. 30, 2012 Common Unit [Member] KMI Asset Drop Down [Member]	Sep. 30, 2012 Common Units [Member] KMI Asset Drop Down [Member]	Aug. 13, 2012 Common Units [Member] KMI Asset Drop Down [Member]	Sep. 30, 2012 Kinder Morgan, Inc. [Member] El Paso Midstream Investment Company, LLC. [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss		$ 167,000,000
Ownership interest			50.00%		50.00%									50.00%
Business acquisition, cost of acquired entity, purchase price			289,000,000				6,200,000,000
Business acquisition, equity interest issued (in shares)										3,792,461	4,667,575
Closing market price (usd per share)				$ 76.23
Net equity investment			301,000,000		870,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid							3,500,000,000
Stock Issued During Period, Value, Acquisitions												400,000,000
Sale of Stock, Price Per Share													$ 81.52
Miles Of Pipe	53,000				10,200			13,900
Business Acquisition, Purchase Price Allocation, Liabilities Assumed							$ 2,300,000,000
Business Acquisition, Percentage of Voting Interests Acquired									100.00%
System capacity in bcf					5.6			7.5
Storage capacity in bcf						200