Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Decrease (increase) in current assets:
Receivables, net	$ (3,110)	$ (679)	$ (806)
Inventories	643	(407)	(77)
Income taxes receivable	128	545	(668)
Prepaid expenses and other	(2)	107	56
Increase (decrease) in current liabilities:
Accounts payable	2,004	670	1,475
Accrued expenses	(18)	(99)	73
Taxes other than income taxes	312	(66)	107
Income taxes payable	124	(3)	95
Changes in current assets and current liabilities	81	68	255
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized	(397)	(457)	(390)
Income taxes received (paid), net	(486)	690	(165)
Supplemental Cash Flow Information (Textual)
Notes receivable and other	214	182
Noncash investing or financing activities	0		0
Paulsboro Refinery [Member]
Cash Flows Related to Discontinued Operations
Cash provided by (used in) operating activities	0	88	10
Cash used in investing activities	0	(41)	(121)
Supplemental Cash Flow Information (Textual)
Notes receivable and other		160
Delaware City Refinery [Member]
Cash Flows Related to Discontinued Operations
Cash provided by (used in) operating activities	0	(26)	(126)
Cash used in investing activities	$ 0	$ 0	$ (153)