Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net Income	$ 27,008	$ 19,136	$ 10,563
Adjustments
Depreciation, depletion and amortization	12,911	13,063	12,110
Dry hole expense	377	496	552
Distributions less than income from equity affiliates	(570)	(501)	(103)
Net before-tax gains on asset retirements and sales	(1,495)	(1,004)	(1,255)
Net foreign currency effects	(103)	251	466
Deferred income tax provision	1,589	559	467
Net decrease (increase) in operating working capital	2,318	76	(2,301)
Increase in long-term receivables	(150)	(12)	(258)
Decrease in other deferred charges	341	48	201
Cash contributions to employee pension plans	(1,467)	(1,450)	(1,739)
Other	339	697	670
Net Cash Provided by Operating Activities	41,098	31,359	19,373
Investing Activities
Acquisition of Atlas Energy	(3,009)
Advance to Atlas Energy	(403)
Capital expenditures	(26,500)	(19,612)	(19,843)
Proceeds and deposits related to asset sales	3,517	1,995	2,564
Net purchases of time deposits	(1,104)	(2,855)
Net (purchases) sales of marketable securities	(74)	(49)	127
Repayment of loans by equity affiliates	339	338	336
Net (purchases) sales of other short-term investments	(255)	(732)	244
Net Cash Used for Investing Activities	(27,489)	(20,915)	(16,572)
Financing Activities
Net borrowings (payments) of short-term obligations	23	(212)	(3,192)
Proceeds from issuance of long-term debt	377	1,250	5,347
Repayments of long-term debt and other financing obligations	(2,769)	(156)	(496)
Cash dividends - common stock	(6,139)	(5,674)	(5,302)
Distributions to noncontrolling interests	(71)	(72)	(71)
Net (purchases) sales of treasury shares	(3,193)	(306)	168
Net Cash Used for Financing Activities	(11,772)	(5,170)	(3,546)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(33)	70	114
Net Change in Cash and Cash Equivalents	1,804	5,344	(631)
Cash and Cash Equivalents at January 1	14,060	8,716	9,347
Cash and Cash Equivalents at December 31	$ 15,864	$ 14,060	$ 8,716