Debt Subsequent Event (Details) (Kinder Morgan Energy Partners, L.P. [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013
2.65% Senior Notes due February 1, 2019 [Member]
Subsequent Event [Line Items]
Senior Notes	$ 800
Debt Instrument, Interest Rate, Stated Percentage	2.65%
4.15% Senior Notes due February 1, 2024 [Member] [Member]
Subsequent Event [Line Items]
Senior Notes	650
Debt Instrument, Interest Rate, Stated Percentage	4.15%
5% Senior Notes due 2043 [Member]
Subsequent Event [Line Items]
Senior Notes	300
Debt Instrument, Interest Rate, Stated Percentage	5.00%
KMP Senior Notes issued on February 28, 2013 [Member]
Subsequent Event [Line Items]
Senior Notes	$ 400
Debt Instrument, Interest Rate, Stated Percentage	5.00%