Acquisitions (Details) (USD $)	6 Months Ended		0 Months Ended		1 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Aug. 01, 2011 Acquisition [Member] Pembroke Acquisition [Member]	Feb. 04, 2010 ASA And Renew Acquisitions [Member]	Jan. 31, 2010 ASA Acquisition [Member]	Dec. 31, 2009 ASA Acquisition [Member]	Feb. 28, 2010 Renew Acquisition [Member]	Dec. 31, 2009 Renew Acquisition [Member]	Jun. 30, 2011 Terminals [Member]
Acquisitions (Textual)
Business acquisition, effective date of acquisition			August 1, 2011
Business acquisition, percentage of voting interests to be acquired			100.00%
Throughput capacity of petroleum refining (barrels per day)			270,000
Business acquisition, cost of acquired entity, purchase price			$ 1,800,000,000
Business acquisition, cost of acquired entity, purchase price of working capital			1,100,000,000
Payments to acquire pipeline and terminal facilties	37,000,000	0							37,000,000
Number of product terminal facilities purchased				3					2
Payments to acquire businesses, gross	$ 0	$ 260,000,000			$ 202,000,000	$ 20,000,000	$ 79,000,000	$ 1,000,000