CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities
Net income (loss)	$ 484	$ 2,183
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation, depletion, and amortization	1,022	930
Deferred income taxes	162	210
Dry hole expense and impairments of unproved properties	177	149
Impairments	29	50
(Gains) losses on divestitures, net	(144)	17
Unrealized (gains) losses on derivatives, net	246	(142)
Other	44	46
Changes in assets and liabilities
Deepwater Horizon settlement and related costs		30
Algeria exceptional profits tax settlement	450	(1,804)
Tronox-related contingent loss		275
(Increase) decrease in accounts receivable	40	(27)
Increase (decrease) in accounts payable and accrued expenses	(125)	(258)
Other items - net	118	232
Net cash provided by (used in) operating activities	2,503	1,891
Cash Flows from Investing Activities
Additions to properties and equipment and dry hole costs	(1,710)	(1,703)
Acquisition of midstream business	(135)
Divestitures of properties and equipment and other assets	361	47
Other - net	(133)	(42)
Net cash provided by (used in) investing activities	(1,617)	(1,698)
Cash Flows from Financing Activities
Borrowings, net of issuance costs	385	319
Repayments of debt		(171)
Increase (decrease) in accounts payable, banks	86	(19)
Dividends paid	(46)	(45)
Repurchase of common stock	(27)	(22)
Issuance of common stock, including tax benefit on stock option exercises	18	35
Sale of subsidiary units	(1)
Distributions to noncontrolling interest owners	(33)	(25)
Contributions from noncontrolling interest owners	1	5
Net cash provided by (used in) financing activities	383	77
Effect of Exchange Rate Changes on Cash	(5)	(10)
Net Increase (Decrease) in Cash and Cash Equivalents	1,264	260
Cash and Cash Equivalents at Beginning of Period	2,471	2,697
Cash and Cash Equivalents at End of Period	$ 3,735	$ 2,957