Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 2,044	$ 762
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	1,141	1,096
Noncash interest expense and other income, net	20	8
Asset impairment loss	0	2
Gain on sale of Delaware City Refinery assets	0	(92)
Stock-based compensation expense	34	32
Deferred income tax expense	393	285
Changes in current assets and current liabilities	840	592
Changes in deferred charges and credits and other operating activities, net	(144)	(63)
Net cash provided by operating activities	4,328	2,622
Cash flows from investing activities:
Capital expenditures	(1,584)	(1,226)
Deferred turnaround and catalyst costs	(501)	(410)
Acquisition of Pembroke Refinery, net of cash acquired	(1,675)	0
Acquisition of pipeline and terminal facilities	(37)	0
Acquisition of ethanol plants	0	(260)
Proceeds from the sale of the Delaware City Refinery assets and associated terminal and pipeline assets	0	220
Other investing activities, net	(24)	15
Net cash used in investing activities	(3,821)	(1,661)
Non-bank debt:
Borrowings	0	1,244
Repayments	(718)	(517)
Accounts receivable sales program:
Proceeds from the sale of receivables	0	1,225
Repayments	0	(1,325)
Purchase of common stock for treasury	(270)	(2)
Issuance of common stock in connection with stock-based compensation plans	42	12
Common stock dividends	(85)	(85)
Debt issuance costs	0	(10)
Contributions from noncontrolling interests	12	0
Other financing activities, net	17	5
Net cash provided by (used in) financing activities	(1,002)	547
Effect of foreign exchange rate changes on cash	(10)	19
Net increase in cash and temporary cash investments	(505)	1,527
Cash and temporary cash investments at beginning of period	3,334	825
Cash and temporary cash investments at end of period	$ 2,829	$ 2,352