The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

Name:	us-gaap_AdditionalCollateralAggregateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Risk Management Credit Risks (Details) (USD $)	3 Months Ended
Risk Management Credit Risks (Details) (USD $)	Mar. 31, 2014 Kinder Morgan Energy Partners, L.P. [Member] notches	Mar. 31, 2014 Kinder Morgan Energy Partners, L.P. [Member] One notch credit downgrade [Member]	Mar. 31, 2014 Kinder Morgan Energy Partners, L.P. [Member] Two notch credit downgrade [Member]	Mar. 31, 2014 Kinder Morgan Energy Partners, L.P. [Member] Commodity [Member]	Dec. 31, 2013 Kinder Morgan Energy Partners, L.P. [Member] Commodity [Member]	Mar. 31, 2014 Kinder Morgan, Inc. [Member] External Credit Rating, Non Investment Grade [Member]	Dec. 31, 2013 Kinder Morgan, Inc. [Member] Commodity [Member]
Credit Derivatives [Line Items]
Letters of Credit Outstanding, Amount				$ 0	$ 0		$ 167,000,000
Additional Collateral, Aggregate Fair Value		$ 0	$ 25,000,000			$ 0
Number of Credit Rating Notches	2