Share Distributions (Details) (USD $)	3 Months Ended
	Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011
Share Distribution, In Reporting Period [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution date	2011-08-12		2011-05-13		2011-02-14
Shares distributed per outstanding share (in shares)	0.017895		0.017102		0.017393
Equivalent distribution value per share (in dollars per share)	$ 1.15	[1]	$ 1.14	[1]	$ 1.13	[1]
Total number of additional shares distributed (in shares)	1,701,916		1,599,149		1,598,556
Share Distribution, Subsequent to Reporting Period [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution date	2011-11-14	[2]
Shares distributed per outstanding share (in shares)	0.017579	[2]
Equivalent distribution value per share (in dollars per share)	$ 1.16	[1],[2]
Total number of additional shares distributed (in shares)	1,701,781	[2],[3]
Average ten day closing market price, amount per share	$ 65.986
Average closing market price, period	October 13-16, 2011
Date of record	2011-10-31
Declaration date	2011-10-16

[1] This is the cash distribution paid to each common unit of KMP during the quarter indicated and is used to calculate our distribution of shares as discussed above. Because of this calculation, the market value of the shares distributed on the date of distribution may be less or more than the cash distribution per common unit of KMP.

[2] Distribution declared on October 16, 2011 and payable to shareholders of record as of October 31, 2011.

[3] Distribution determined by dividing $1.16, the cash amount to be distributed per KMP common unit by $65.986, the average of our shares' closing market prices from October 13-26, 2011, the ten consecutive trading days preceding the date on which our shares began to trade ex-dividend under the rules of the New York Stock Exchange.