Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 841	$ 470
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	751	724
Noncash interest expense and other income, net	21	4
Asset impairment loss	0	2
Gain on sale of Delaware City Refinery assets	0	(92)
Stock-based compensation expense	23	22
Deferred income tax expense	166	83
Changes in current assets and current liabilities	1,147	613
Changes in deferred charges and credits and other operating activities, net	5	(56)
Net cash provided by operating activities	2,954	1,770
Cash flows from investing activities:
Capital expenditures	(969)	(785)
Deferred turnaround and catalyst costs	(432)	(343)
Acquisition of pipeline and terminal facilities	(37)	0
Advance payment related to the Pembroke Acquisition	(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	(19)	11
Net cash used in investing activities	(1,494)	(1,157)
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)
Issuance of common stock in connection with stock-based compensation plans	30	11
Common stock dividends	(57)	(57)
Debt issuance costs	0	(10)
Contributions from noncontrolling interest	9	0
Other financing activities, net	7	4
Net cash provided by (used in) financing activities	(729)	575
Effect of foreign exchange rate changes on cash	42	(12)
Net increase in cash and temporary cash investments	773	1,176
Cash and temporary cash investments at beginning of period	3,334	825
Cash and temporary cash investments at end of period	$ 4,107	$ 2,001