Partners Capital Equity Issuances (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Common Units [Member]	Feb. 26, 2013 Common Units [Member]	Mar. 31, 2013 Common Units [Member] March 2013 KMI Asset Drop Down [Member]	Mar. 01, 2013 Common Units [Member] March 2013 KMI Asset Drop Down [Member]	Mar. 31, 2013 Common Unit [Member] March 2013 KMI Asset Drop Down [Member]
Limited Partners' Capital Account [Line Items]
Shares issued			4,600,000
Sale of Stock, Price Per Share				$ 86.35		$ 86.72
Proceeds on sales of units	$ 385	$ 124
Business acquisition, equity interest issued (in shares)							1,249,452
Proceeds from Issuance or Sale of Equity			385
Stock Issued During Period, Value, Acquisitions					$ 108