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	$ 3,395	$ 2,343
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	3,030	2,155
Asset retirement obligation accretion	114	74
Provision for deferred income taxes	1,065	706
Other	(34)	109
Changes in operating assets and liabilities:
Receivables	(417)	(207)
Inventories	(35)	(21)
Drilling advances	(23)	14
Deferred charges and other	(54)	(137)
Accounts payable	119	139
Accrued expenses	(38)	(352)
Deferred credits and noncurrent liabilities	49	(23)
NET CASH PROVIDED BY OPERATING ACTIVITIES	7,171	4,800
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to oil and gas property	(4,758)	(3,041)
Additions to gas gathering, transmission and processing facilities	(472)	(328)
Acquisition of Devon properties		(1,018)
Acquisition of BP properties and facilities		(2,472)
Acquisitions, other	(509)	(60)
Proceeds from sale of oil and gas properties	202
Deposit related to acquisition of BP properties		(3,500)
Other, net	(89)	(37)
NET CASH USED IN INVESTING ACTIVITIES	(5,626)	(10,456)
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net	(940)	(37)
Fixed-rate debt borrowings		1,484
Proceeds from issuance of common stock		2,258
Proceeds from issuance of mandatory convertible preferred stock		1,227
Dividends paid	(230)	(152)
Common stock activity	47	29
Treasury stock activity, net	4	4
Cost of debt and equity transactions	(2)	(17)
Other	28	23
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(1,093)	4,819
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	452	(837)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	134	2,048
CASH AND CASH EQUIVALENTS AT END OF PERIOD	586	1,211
SUPPLEMENTARY CASH FLOW DATA:
Interest paid, net of capitalized interest	165	176
Income taxes paid, net of refunds	$ 1,335	$ 969