Risk Management Interest Rate Risk Management (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Sep. 30, 2014 Kinder Morgan Energy Partners, L.P. [Member]	Feb. 28, 2014 Kinder Morgan Energy Partners, L.P. [Member]	Sep. 30, 2014 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan, Inc. [Member]	Dec. 31, 2013 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan, Inc. [Member]	Sep. 30, 2014 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan Energy Partners, L.P. [Member]	Sep. 29, 2014 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan Energy Partners, L.P. [Member]	Feb. 28, 2014 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan Energy Partners, L.P. [Member]	Dec. 31, 2013 fixed-to-variable interest rate swap agreement [Member] Kinder Morgan Energy Partners, L.P. [Member]	Sep. 30, 2014 3.50% Senior Notes due March 1, 2021 [Member] Kinder Morgan Energy Partners, L.P. [Member]	Sep. 30, 2014 KMP 4.25% Senior Notes due September 1, 2024 [Member] Kinder Morgan Energy Partners, L.P. [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 725	$ 725	$ 5,775	$ 600	$ 500	$ 4,675
Number of Fixed-to-Variable Interest Rate Swap Agreements Entered Into	5	4
Interest rate, stated percentage									3.50%	4.25%