CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 656	$ 529	[1]
Accounts receivable, net of allowance	1,300	1,114	[1]
Inventories	313	338	[1]
Fair value of derivative contracts	59	55	[1]
Assets held for sale	32	211	[1]
Other Assets, Current	235	130	[1]
Total current assets	2,595	2,377	[1]
Property, Plant and Equipment, Net	26,023	22,330	[1]
Investments	2,213	1,864	[1]
Goodwill	6,532	5,417	[1]
Other intangibles, net	2,459	1,142	[1]
Fair value of derivative contracts	340	634	[1]
Deferred charges and other assets	1,247	1,212	[1]
Total Assets	41,409	34,976	[1]
Current liabilities
Current portion of debt	1,899	1,155	[1]
Accounts payable	1,200	1,091	[1]
Accrued interest	351	327	[1]
Fair value of derivative contracts	28	21	[1]
Accrued other current liabilities	1,138	653	[1]
Total current liabilities	4,616	3,247	[1]
Long-term debt
Long-term portion of debt	17,338	15,907	[1]
Debt fair value adjustments	1,417	1,698	[1]
Total long-term debt	18,755	17,605	[1]
Deferred income taxes	259	249	[1]
Fair value of derivative contracts	60	13	[1]
Other long-term liabilities and deferred credits	911	1,100	[1]
Total long-term liabilities and deferred credits	19,985	18,967	[1]
Total Liabilities	24,601	22,214	[1]
Commitments and contingencies (Notes 3 and 9)
Partners' Capital
Common Units	9,395	4,723	[1]
General partner	3,059	4,026	[1]
Accumulated other comprehensive income	75	168	[1]
Total Kinder Morgan Energy Partners, L.P. Partners' Capital	16,453	12,495	[1]
Noncontrolling interests	355	267	[1]
Total Partners' Capital	16,808	12,762	[1]
Total Liabilities and Partners' Capital	41,409	34,976	[1]
Class B [Member]
Partners' Capital
Common Units	13	14	[1]
i-units [Member]
Partners' Capital
Common Units	$ 3,911	$ 3,564	[1]

[1] Retrospectively adjusted as discussed in Note 1.