CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 409.3	$ 129.1
Restricted deposits	0	50.0
Accounts, notes and interest receivable, net	883.5	951.8
Inventory Net	109.8	92.0
Gas in underground storage	61.8	2.2
Fair value of derivative contracts	71.4	24.0
Other current assets	39.6	37.6
Total current assets	1,575.4	1,286.7
Property, plant and equipment, net	15,595.8	14,603.9
Investments	3,346.2	3,886.0
Notes receivable	165.0	115.0
Goodwill	1,436.2	1,233.6
Other intangibles, net	1,152.0	302.2
Fair value of derivative contracts	632.0	260.7
Deferred charges and other assets	200.1	173.0
Total Assets	24,102.7	21,861.1
Current Liabilities
Current portion of debt	1,637.8	1,262.4
Cash book overdrafts	20.9	32.5
Accounts payable	706.5	630.9
Accrued interest	258.6	239.6
Accrued taxes	38.1	44.7
Deferred revenues	99.5	96.6
Fair value of derivative contracts	120.8	281.5
Accrued other current liabilities	236.9	176.0
Total current liabilities	3,119.1	2,764.2
Long-Term Liabilities and Deferred Credits
Long-term debt Outstanding	11,159.5	10,277.4
Value of interest rate swaps	1,078.9	604.9
Total Long-term debt	12,238.4	10,882.3
Deferred income taxes	249.6	248.3
Fair value of derivative contracts	38.7	172.2
Other long-term liabilities and deferred credits	853.0	501.6
Total long term liabilities and deferred credits	13,379.7	11,804.4
Total Liabilities	16,498.8	14,568.6
Partners Capital [Abstract]
Common units	4,346.9	4,282.2
Class B units	41.5	63.1
i-units	2,857.2	2,807.5
General partner	258.7	244.3
Accumulated other comprehensive loss	3.3	(186.4)
Total Kinder Morgan Energy Partners, L.P. Partners' Capital	7,507.6	7,210.7
Noncontrolling interests	96.3	81.8
Total Partners' Capital	7,603.9	7,292.5
Total Liabilities and Partners' Capital	$ 24,102.7	$ 21,861.1

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The limited partner's ownership share in the capital account balance. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. In general, our limited partner units, consisting of i-units, common units and Class B units (the Class B units are similar to our common units except that they are not eligible for trading on the New York Stock Exchange), will vote together as a single class, with each i-unit, common unit and Class B unit having one vote. We pay our quarterly distributions from operations and interim capital transactions to our common and Class B unitholders in cash, and we pay our quarterly distributions to KMR in additional i-units rather than in cash. As of December 31, 2008, KMR, through its ownership of our i-units, owned approximately 29.3% of all of our outstanding limited partner units.

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Capital account balance of the general partner. The general partner is a partner of a publicly traded limited partnership or master limited partnership who has unlimited liability and manages the partnership.

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- Definition

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

+ Details

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- Definition

Ownership interest of different classes of partners in the publicly listed limited partnership or master limited partnership. Partners include general, limited and preferred partners. Limited liability partnerships (LLPs) are formed in accordance with the laws of the state in which such entities are organized. Because those laws are not uniform, the characteristics of LPCs vary from state to state. However, LLPs generally have the following characteristics: An LLP is an unincorporated association of two or more "persons"; Its members have limited personal liability for the obligations or debts of the entity; It is classified as a partnership for federal income tax purposes.

+ References

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- Details

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, and production equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 12

-Paragraph 5

-Subparagraph b, c

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Chapter 4

-Paragraph 80

-Subparagraph Exhibit 4-8, 3

-IssueDate 2006-05-01

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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