Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ 2,089	$ 324	$ (1,982)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	1,534	1,473	1,527
Asset impairment loss	0	2	607
Loss on shutdown and sales of refinery assets, net	12	888	1,868
Gain on sale of investment in Cameron Highway Oil Pipeline Company	0	(55)	0
Stock-based compensation expense	58	54	66
Deferred income tax expense (benefit)	461	347	(343)
Changes in current assets and current liabilities	81	68	255
Changes in deferred charges and credits and other operating activities, net	(197)	(56)	(175)
Net cash provided by operating activities	4,038	3,045	1,823
Cash flows from investing activities:
Capital expenditures	(2,355)	(1,730)	(2,306)
Deferred turnaround and catalyst costs	(629)	(535)	(415)
Acquisition of Pembroke Refinery, net of cash acquired	(1,691)	0	0
Acquisition of Meraux Refinery	(547)	0	0
Acquisitions of ethanol plants	0	(260)	(577)
Minor acquisitions	(37)	0	(29)
Proceeds from sale of investment in Cameron Highway Oil Pipeline Company	0	330	0
Other investing activities, net	(39)	23	35
Net cash used in investing activities	(5,298)	(1,405)	(3,292)
Non-bank debt:
Borrowings	0	1,544	998
Repayments	(774)	(517)	(285)
Bank credit agreements:
Borrowings	0	0	39
Repayments	(4)	0	(39)
Accounts receivable sales facility:
Proceeds from the sale of receivables	150	1,225	950
Repayments	0	(1,325)	(850)
Proceeds from the sale of common stock, net of issuance costs	0	0	799
Proceeds from the exercise of stock options	49	20	11
Purchase of common stock for treasury	(349)	(13)	(4)
Common stock dividends	(169)	(114)	(324)
Contributions from noncontrolling interests	22	0	0
Other financing activities, net	9	(4)	(6)
Net cash provided by (used in) financing activities	(1,066)	816	1,289
Effect of foreign exchange rate changes on cash	16	53	65
Net increase (decrease) in cash and temporary cash investments	(2,310)	2,509	(115)
Cash and temporary cash investments at beginning of year	3,334	825	940
Cash and temporary cash investments at end of year	$ 1,024	$ 3,334	$ 825