v2.4.0.6

Acquisitions and Divestitures Income Tax Impact on the Drop-Down of EP Assets to KMP and KMP Investment in EP Midstream (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 TGP and EPNG drop down transaction [Member]	Dec. 31, 2012 TGP and EPNG drop down transaction [Member]	Mar. 31, 2013 EPNG and El Paso Midstream drop down transaction [Member] [Member]	Jun. 01, 2012 Kinder Morgan Energy Partners, L.P. [Member] Midstream Investment Company, LLC [Member]
Business Acquisition [Line Items]
Deferred Tax Assets, Deferred Income			$ 448	$ 53
Property, Plant and Equipment, Estimated Useful Lives		25 years
Business Acquisition, Percentage of Voting Interests Acquired					50.00%
Estimated annual tax expense arising from drop-down transactions	20
Income tax expense from deferred charges that arose from drop-down transactions	$ 5

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Income tax expense from deferred charges that arose from drop-down transactions

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Percentage of voting equity interests acquired in the business combination.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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