Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 398	$ 841
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	770	751
Asset impairment loss	611	0
Noncash interest expense and other income, net	11	21
Stock-based compensation expense	20	23
Deferred income tax expense	480	166
Changes in current assets and current liabilities	725	1,147
Changes in deferred charges and credits and other operating activities, net	(21)	5
Net cash provided by operating activities	2,994	2,954
Cash flows from investing activities:
Capital expenditures	(1,420)	(969)
Deferred turnaround and catalyst costs	(264)	(432)
Advance payment related to acquisition of Pembroke Refinery	0	(37)
Minor acquisitions	(66)	(37)
Other investing activities, net	9	(19)
Net cash used in investing activities	(1,741)	(1,494)
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	1,300	0
Repayments	(1,450)	0
Purchase of common stock for treasury	(147)	0
Proceeds from the exercise of stock options	11	30
Common stock dividends	(166)	(57)
Contributions from noncontrolling interest	25	9
Other financing activities, net	(2)	7
Net cash used in financing activities	(991)	(729)
Effect of foreign exchange rate changes on cash	9	42
Net increase in cash and temporary cash investments	271	773
Cash and temporary cash investments at beginning of period	1,024	3,334
Cash and temporary cash investments at end of period	$ 1,295	$ 4,107