Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net cash provided by continuing operatons:
Net income	$ 810	$ 1,992
Adjustments to reconcile net income to net cash provided by operating activities:
Discontinued operations		(1,239)
Loss on early extinguishment of debt		279
Deferred income taxes	75	(51)
Depreciation, depletion and amortization	1,154	1,199
Impairments	263	307
Pension and other postretirement benefits, net	(22)	22
Exploratory dry well costs and unproved property impairments	174	264
Net gain on disposal of assets	(138)	(50)
Equity method investments, net	7	(21)
Changes in operating capital:
Changes in current receivables	(107)	78
Changes in inventories	(18)	46
Changes in current accounts payable and accrued liabilities	(450)	372
All other operating, net	(6)	122
Net cash provided by continuing operations	1,742	3,320
Net cash provided by discontinued operations		1,090
Net cash provided by operating activities	1,742	4,410
Investing activities:
Additions to property, plant and equipment	(2,181)	(1,702)
Disposal of assets	218	371
Investments - return of capital	21	36
Investing activities of discontinued operations	0	(493)
Property deposit		(100)
All other investing, net	(59)	15
Net cash used in investing activities	(2,001)	(1,873)
Financing activities:
Commercial paper, net	550
Debt issuance costs	(9)
Debt repayments	(111)	(2,843)
Dividends paid	(240)	(356)
Financing activities of discontinued operations		2,916
Distribution in spin-off		(1,622)
All other financing, net	20	126
Net cash provided by (used in) financing activities	210	(1,779)
Effect of exchange rate changes on cash:
Effect of exchange rate changes on cash	8	2
Net increase (decrease) in cash and cash equivalents	(41)	760
Cash and cash equivalents at beginning of period	493	3,951
Cash and cash equivalents at end of period	$ 452	$ 4,711