Summarized Income Statement Information for Kinder Morgan Energy Partners, L.P. (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Schedule of Equity Method Investments [Line Items]
Net Income (Loss)	$ (15.0)		$ 8.8		$ (18.3)		$ 51.6
KMP [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	2,195.1		2,060.0		6,207.2		6,151.1
Operating costs, expenses and other	1,746.2	[1],[2],[3]	1,652.7	[1],[2],[3]	5,059.0	[1],[2],[3]	5,012.3	[1],[2],[3]
Operating income	448.9		407.3		1,148.2		1,138.8
Net income	216.3		322.4		789.1		914.9
Net income attributable to KMP	214.5		320.8		782.8		907.3
General Partner's interest in net income	298.2	[4]	267.3	[4]	871.0	[4]	609.0	[4]
Limited Partners' interest in net income (loss)	(83.7)		53.5		(88.2)		298.3
Special bonus expense allocated to KMP					87.1
KMP's increase in expense associated with rate case liability adjustments	69.3				234.3		158.0
Net income reduction for share of special bonus expense					15.2
Net income reduction for share of rate case liability adjustment	12.5				42.7		29.0
Waived incentive distribution to KMP's General Partner resulting from ICT Distribution							168.3
Net income increase from higher KMP limited partners net income related to ICT Distribution							30.8
KMP's previously held equity interest in Kinderhawk	50.00%				50.00%
KMP's loss on remeasurement of previously held equity interest in KinderHawk	167.2				167.2
Waived incentive distribution to KMP's General Partner related to KMP equity issued to finance business acquisition	7.2		5.8		21.4		11.1
Net income reduction for share of KMP's remeasurement of equity interest in KinderHawk	$ 30.3				$ 30.3

[1] Nine month 2011 amount includes $87.1 million allocated to KMP from KMI related to a special bonus expense to non-senior management employees; however, we and KMP do not have any obligation, nor did we or KMP pay any amounts related to this expense.

[2] Three and nine month 2011 amounts include a $167.2 million loss from the remeasurement of KMP's previously held 50% equity interest in KinderHawk Field Services LLC (KinderHawk) to fair value.

[3] Three month 2011 amount includes an increase in expense of $69.3 million primarily related to an adverse tentative court decision on the amount of rights-of-way lease payment obligations (amounts included in the $69.3 million relate to periods prior to 2011). Nine month 2011 amount includes an increase in expense of $234.3 million, primarily associated with adjustments to rate case reserves and rights-of-way lease payment obligations. Nine month 2010 amount includes a $158.0 million increase in expense associated with rate case liability adjustments.

[4] Three and nine month 2011 amounts include a waived incentive of $7.2 million and $21.4 million, respectively, related to KMP equity issued to finance its May 2010 acquisition of a 50% interest in KinderHawk's natural gas gathering and treating business. Three and nine month 2010 amounts include a waived incentive of $5.8 million and $11.1 million, respectively, related to KMP equity issued to finance its acquisition of a 50% interest in KinderHawk. Nine month 2010 amount also includes a reduction of incentive of $168.3 million resulting from the ICT Distribution (see following).