Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 1,071	$ 2,044
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	1,172	1,141
Asset impairment loss	956	0
Noncash interest expense and other income, net	18	20
Stock-based compensation expense	29	34
Deferred income tax expense	576	393
Changes in current assets and current liabilities	1,351	840
Changes in deferred charges and credits and other operating activities, net	(66)	(144)
Net cash provided by operating activities	5,107	4,328
Cash flows from investing activities:
Capital expenditures	(2,129)	(1,584)
Deferred turnaround and catalyst costs	(339)	(501)
Acquisition of Pembroke Refinery, net of cash acquired	0	(1,675)
Minor acquisitions	(77)	(37)
Other investing activities, net	(28)	(24)
Net cash used in investing activities	(2,573)	(3,821)
Non-bank debt:
Borrowings	300	0
Repayments	(862)	(718)
Bank credit agreements:
Borrowings	1,100	0
Repayments	(1,100)	0
Accounts receivable sales program:
Proceeds from the sale of receivables	1,500	0
Repayments	(1,650)	0
Purchase of common stock for treasury	(148)	(270)
Proceeds from the exercise of stock options	36	42
Common stock dividends	(263)	(85)
Contributions from noncontrolling interest	34	12
Other financing activities, net	8	17
Net cash used in financing activities	(1,045)	(1,002)
Effect of foreign exchange rate changes on cash	36	(10)
Net increase (decrease) in cash and temporary cash investments	1,525	(505)
Cash and temporary cash investments at beginning of period	1,024	3,334
Cash and temporary cash investments at end of period	$ 2,549	$ 2,829