Acquisitions (Details) (USD $)	12 Months Ended				0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended		1 Months Ended		1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary [Member]	Aug. 01, 2011 Interest Percentage - Initial [Member]	Dec. 31, 2011 Interest Percentage - Addition [Member]	Oct. 02, 2011 Meraux Acquisition [Member]	Dec. 31, 2012 Meraux Acquisition [Member]	Dec. 31, 2011 Meraux Acquisition [Member]	Aug. 01, 2011 Pembroke Acquisition [Member]	Sep. 30, 2012 Pembroke Acquisition [Member]	Dec. 31, 2011 Pembroke Acquisition [Member]	Dec. 31, 2009 ASA Acquisition [Member]	Jan. 31, 2010 ASA Acquisition [Member] plants	Dec. 31, 2009 Renew Acquisition [Member]	Feb. 28, 2010 Renew Acquisition [Member] plants
Purchase Price Allocation
Current assets, net of cash acquired											$ 2,215,000,000
Inventories								227,000,000
Property, plant and equipment								293,000,000			947,000,000
Intangible assets											22,000,000
Deferred charges and other assets, net								28,000,000			37,000,000
Current liabilities, less current portion of debt and capital lease obligations											(1,294,000,000)
Debt and capital leases assumed, including current portion											(12,000,000)
Deferred income taxes											(159,000,000)
Other long-term liabilities								(1,000,000)			(60,000,000)
Noncontrolling interest											(5,000,000)
Purchase price								547,000,000
Purchase price, net of cash acquired											1,691,000,000
Acquisitions (Textual)
Effective date of acquisition							Oct. 01, 2011			Aug. 01, 2011
Purchase price of acquired entity							586,000,000		547,000,000	1,800,000,000		1,700,000,000		202,000,000		79,000,000
Purchase price allocation adjustment to inventory								8,000,000
Purchase price allocation adjustment to property, plant, and equipment								(27,000,000)			143,000,000
Purchase price allocation adjustment to deferred charges and other assets								19,000,000
Throughput capacity of petroleum refining							135,000			270,000
Percentage of outstanding shares acquired										100.00%
Purchase price of working capital										1,100,000,000
Purchase price allocation adjustment increase to deferred tax liabilities											124,000,000
Purchase price allocation adjustment increase to other long-term liabilities											17,000,000
Depreciation expense true-up	1,574,000,000	1,534,000,000	1,405,000,000								6,000,000
Joint venture ownership percentage				50.00%	85.00%	15.00%
Number of plants purchased														2		1
Other payments to acquire businesses													$ 20,000,000		$ 1,000,000