Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified			9 Months Ended		1 Months Ended	30 Months Ended		1 Months Ended	16 Months Ended		1 Months Ended	9 Months Ended	2 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Apr. 30, 2011 Rainbow pipeline bbl	Sep. 30, 2013 Rainbow pipeline	Feb. 26, 2013 Rainbow pipeline item	Jun. 30, 2012 Rangeland Pipeline Release bbl	Sep. 30, 2013 Rangeland Pipeline Release	Jul. 04, 2013 Rangeland Pipeline Release item	Feb. 28, 2013 Bay Springs Pipeline bbl	Sep. 30, 2013 Bay Springs Pipeline	Jun. 30, 2013 Kemp River Pipeline Release item bbl	Sep. 30, 2013 Kemp River Pipeline Release
Environmental
Estimated environmental reserve	$ 99	$ 96
Reserve for environmental liabilities, short-term	13	13
Reserve for environmental liabilities, long-term	86	83
Probable recoveries from insurers and third parties recorded as a receivable	10	42
Actual cash expenditures for environmental liabilities, period paid			3 years	5 years
Total estimated cost to clean up and remediate the site, before insurance recoveries														15
Total cost to clean up and remediate the site, before insurance recoveries						70			46			6
Estimated size of release (in barrels)					28,000			3,000			120		700
Penalty or fines assessed									$ 0
Number of enforcement actions							4			4
Number of events occurred													2