Partners Capital Equity Issuances (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended		2 Months Ended	3 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Feb. 24, 2014 Common units	Sep. 30, 2014 Common units	Feb. 17, 2014 Common units	Sep. 30, 2014 i-units [Member]	Dec. 31, 2013 UBS [Member] Common units	Sep. 30, 2014 UBS [Member] Common units	Dec. 31, 2013 UBS [Member] Kinder Morgan Management, LLC [Member] i-units [Member]	Sep. 30, 2014 UBS [Member] Kinder Morgan Management, LLC [Member] i-units [Member]
Limited Partners' Capital Account [Line Items]
Units issued for cash, Units			7,935,000
Sale of Stock, Price Per Share					$ 78.32
Proceeds from issuance of i-units	$ 134	$ 145	$ 603	$ 441		$ 134
Stock Issued During Period, Shares, Issued for Cash							198,110	5,513,424	76,100	1,734,513