CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities
Net income (loss)	$ (998)	$ (3,236)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation, depletion, and amortization	1,149	1,256
Dry hole expense and impairments of unproved properties	35	1,009
Impairments	16	2,783
(Gains) losses on divestitures, net	(2)	334
Total (gains) losses on derivatives, net	299	152
Operating portion of net cash received (paid) in settlement of derivative instruments	105	91
Other	115	45
Changes in assets and liabilities
(Increase) decrease in accounts receivable	46	357
Increase (decrease) in accounts payable and accrued expenses	(403)	(279)
Other items, net	(86)	(608)
Net cash provided by (used in) operating activities	(137)	(4,504)
Cash Flows from Investing Activities
Additions to properties and equipment and dry hole costs	(1,022)	(1,957)
Divestitures of properties and equipment and other assets	35	22
Other, net	14	10
Net cash provided by (used in) investing activities	(973)	(1,925)
Cash Flows from Financing Activities
Borrowings, net of issuance costs	4,682	4,583
Repayments of debt	(1,608)	(2,830)
Financing portion of net cash received (paid) for derivative instruments	(555)	(146)
Increase (decrease) in outstanding checks	(150)	(39)
Dividends paid	(25)	(139)
Repurchase of common stock	(30)	(36)
Issuance of common stock, including tax benefit on share-based compensation awards	30	12
Distributions to noncontrolling interest owners	(78)	(67)
Proceeds from conveyance of future hard minerals royalty revenues, net of transaction costs	413	0
Net cash provided by (used in) financing activities	3,119	1,369
Effect of Exchange Rate Changes on Cash	(1)	(1)
Net Increase (Decrease) in Cash and Cash Equivalents	2,008	(5,061)
Cash and Cash Equivalents at Beginning of Period	939	7,369
Cash and Cash Equivalents at End of Period	2,947	2,308
Subsidiary Equity Transactions [Member]
Cash Flows from Financing Activities
Sale of subsidiary units	440	31
Tronox Litigation [Member] | Judicial Ruling [Member]
Changes in assets and liabilities
Tronox-related contingent liability	0	(5,210)
Excluding Certain International Locations [Member]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Deferred income taxes	$ (413)	$ (1,198)