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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