CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOW FROM OPERATING ACTIVITIES
Net income	$ 4,262	$ 5,137
Adjustments to reconcile net income to net cash provided by operating activities:
Discontinued operations, net	9	(138)
Depreciation, depletion and amortization of assets	3,320	2,653
Deferred income tax provision	1,255	999
Other noncash charges to income	140	113
Gains on disposition of assets, net	(1)	(22)
Undistributed earnings from equity investments	(14)	(68)
Dry hole and impairment expense	221	109
Changes in operating assets and liabilities, net	(663)	(129)
Operating cash flow from continuing operations	8,529	8,654
Operating cash flow from discontinued operations, net of taxes	(30)	(16)
Net cash provided by operating activities	8,499	8,638
CASH FLOW FROM INVESTING ACTIVITIES
Capital expenditures	(7,716)	(4,969)
Payments for purchases of assets and businesses	(1,164)	(4,070)
Other, net	9	(19)
Investing cash flow from continuing operations	(8,871)	(9,058)
Investing cash flow from discontinued operations		2,570
Net cash used by investing activities	(8,871)	(6,488)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt	1,736	2,111
Payments of long-term debt		(1,523)
Proceeds from issuance of common stock	61	47
Purchases of treasury stock	(204)	(159)
Distributions to noncontrolling interest		(121)
Cash dividends paid	(1,252)	(1,060)
Other, net	10	16
Net cash provided (used) by financing activities	351	(689)
(Decrease) increase in cash and cash equivalents	(21)	1,461
Cash and cash equivalents-beginning of period	3,781	2,578
Cash and cash equivalents-end of period	$ 3,760	$ 4,039