Partners Capital Equity Issuances (Details) (USD $)				12 Months Ended			12 Months Ended					12 Months Ended		12 Months Ended
	Dec. 31, 2012	Feb. 26, 2012	Mar. 14, 2012 TGS Development, L.P. [Member]	Dec. 31, 2012 El Paso Midstream Investment Company, LLC. [Member]	Dec. 31, 2012 i-units [Member]	Aug. 13, 2012 i-units [Member]	Dec. 31, 2012 Common Unit [Member] KMI Asset Drop Down [Member]	Dec. 31, 2012 Common Units [Member]	Dec. 31, 2011 Common Units [Member]	Dec. 14, 2012 Common Units [Member]	Jun. 30, 2011 Common Units [Member]	Dec. 31, 2012 Common Units [Member] KMI Asset Drop Down [Member]	Aug. 13, 2012 Common Units [Member] KMI Asset Drop Down [Member]	Dec. 31, 2012 Issued under equity distribution agreement [Member]	Dec. 31, 2011 Issued under equity distribution agreement [Member]
Limited Partners' Capital Account [Line Items]
Shares issued					10,120,000			4,485,000	7,705,000
Sale of Stock, Price Per Share			$ 83.87			$ 73.50				$ 78.60	$ 71.44		$ 81.52
Value of units available for sale under third amendment of equity distribution agreement with UBS	$ 1,900,000,000
Value of units available for sale under second amendment of equity distribution agreement with UBS		1,200,000,000
Units issued (in shares)														6,932,576	5,764,708
Proceeds on sales of units														560,000,000	421,000,000
Business acquisition, equity interest issued (in shares)				3,792,461			4,667,575
Stock Issued During Period, Value, Acquisitions							381,000,000					381,000,000
Proceeds from Issuance or Sale of Equity					$ 727,000,000			$ 0	$ 534,000,000