CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities
Net income (loss)	$ (1,609)	$ (3,128)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation, depletion, and amortization	2,133	2,470
Deferred income taxes	(820)	(1,187)
Dry hole expense and impairments of unproved properties	45	1,040
Impairments	34	2,813
(Gains) losses on divestitures, net	102	425
Loss on early extinguishment of debt	124	0
Total (gains) losses on derivatives, net	610	(158)
Operating portion of net cash received (paid) in settlement of derivative instruments	165	172
Other	203	74
Changes in assets and liabilities
(Increase) decrease in accounts receivable	922	(105)
Increase (decrease) in accounts payable and accrued expenses	(717)	(198)
Other items, net	(100)	(269)
Net cash provided by (used in) operating activities	1,092	(3,261)
Cash Flows from Investing Activities
Additions to properties and equipment and dry hole costs	(1,879)	(3,501)
Divestitures of properties and equipment and other assets	900	700
Other, net	14	16
Net cash provided by (used in) investing activities	(965)	(2,785)
Cash Flows from Financing Activities
Borrowings, net of issuance costs	5,275	4,787
Repayments of debt	(5,425)	(3,857)
Financing portion of net cash received (paid) for derivative instruments	(727)	(77)
Increase (decrease) in outstanding checks	(159)	(109)
Dividends paid	(51)	(277)
Repurchase of common stock	(31)	(37)
Issuance of common stock, including tax benefit on share-based compensation awards	30	19
Distributions to noncontrolling interest owners	(159)	(135)
Proceeds from conveyance of future hard minerals royalty revenues, net of transaction costs	413	0
Net cash provided by (used in) financing activities	329	849
Effect of Exchange Rate Changes on Cash	(1)	1
Net Increase (Decrease) in Cash and Cash Equivalents	455	(5,196)
Cash and Cash Equivalents at Beginning of Period	939	7,369
Cash and Cash Equivalents at End of Period	1,394	2,173
Subsidiary Equity Transactions [Member]
Cash Flows from Financing Activities
Sale of subsidiary units	1,163	187
Equity Component of 7.50% Tangible Equity Units [Member]
Cash Flows from Financing Activities
Sale of subsidiary units	0	348
Tronox Litigation [Member] | Judicial Ruling [Member]
Changes in assets and liabilities
Tronox-related contingent liability	$ 0	$ (5,210)