Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 652	$ (432)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	430	384
Asset impairment losses	0	611
Noncash interest expense and other income, net	1	7
Stock-based compensation expense	12	10
Deferred income tax expense	173	61
Changes in current assets and current liabilities	255	903
Changes in deferred charges and credits and other operating activities, net	26	0
Net cash provided by operating activities	1,549	1,544
Cash flows from investing activities:
Capital expenditures	(577)	(726)
Deferred turnaround and catalyst costs	(287)	(158)
Proceeds from the sale of the Paulsboro Refinery	0	160
Other investing activities, net	4	10
Net cash used in investing activities	(860)	(714)
Non-bank debt:
Repayments	(180)	0
Accounts receivable sales program:
Repayments	0	(150)
Purchase of common stock for treasury	(304)	(106)
Proceeds from the exercise of stock options	38	9
Common stock dividends	(111)	(83)
Contributions from noncontrolling interest	13	11
Other financing activities, net	22	0
Net cash used in financing activities	(522)	(319)
Effect of foreign exchange rate changes on cash	(33)	24
Net increase in cash and temporary cash investments	134	535
Cash and temporary cash investments at beginning of period	1,723	1,024
Cash and temporary cash investments at end of period	$ 1,857	$ 1,559