Partners' Capital and Distributions (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended			9 Months Ended		9 Months Ended
	Oct. 02, 2012	Sep. 30, 2012	Sep. 30, 2012 May 2012 Continuous Offering Program	May 31, 2012 May 2012 Continuous Offering Program	Sep. 30, 2012 September 2012 Continuous Offering Program	Sep. 13, 2012 September 2012 Continuous Offering Program	Sep. 30, 2012 Underwritten Equity Offering
Partners Capital and Distribution
Maximum aggregate offer price of common stock				$ 300		$ 500
Units Sold			7,200,000		1,200,000		11,500,000
Unit split conversion ratio	2		2		2		2
Gross Unit Price (in dollars per unit)							$ 40.015
Proceeds from Sale			302		55		460
General Partner Contribution							9
Costs							(14)
Net Proceeds		812					455
Commissions paid			$ 4		$ 1