Statement of Consolidated Cash Flows (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,810	$ 2,055
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion and amortization	1,732	1,684
Asset impairments	358	532
Exploratory dry hole costs and lease impairment	434	308
Provision (benefit) for deferred income taxes	(224)	(242)
(Income) loss from equity investment in HOVENSA L.L.C.	133	174
Gains on asset sales	(446)	(1,208)
Stock compensation expense	77	84
Changes in operating assets and liabilities and other	(28)	(335)
Net cash provided by operating activities	3,846	3,052
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(4,891)	(3,151)
Proceeds from asset sales	490	183
Other, net	(74)	(25)
Net cash used in investing activities	(4,475)	(2,993)
Debt with maturities of greater than 90 days
Borrowings	14	1,261
Repayments	(50)	(168)
Cash dividends paid	(136)	(131)
Other, net	20	(30)
Net cash provided by (used in) financing activities	(152)	932
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(781)	991
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	1,608	1,362
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 827	$ 2,353