Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 47	$ (287)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	528	617
Results of Operations, Dry Hole Costs	0	93
Gain on Extinguishment of Debt	0	(80)	[1]
Deferred Income Tax Benefit	0	(186)
Gain on Commodity Derivative Instruments	(110)	(44)
Net Cash Received in Settlement of Commodity Derivative Instruments	3	178
Other Adjustments for Noncash Items Included in Income	20	96
Changes in Operating Assets and Liabilities
Decrease (Increase) in Accounts Receivable	59	(38)
Increase (Decrease) in Accounts Payable	45	(24)
(Decrease) in Current Income Taxes Payable	(23)	(16)
Other Current Assets and Liabilities, Net	(35)	(64)
Other Operating Assets and Liabilities, Net	2	6
Net Cash Provided by Operating Activities	536	251
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(587)	(496)
Asset Acquisition	(316)	0
Proceeds from Divestitures and Other	40	232
Net Cash Used in Investing Activities	(863)	(264)
Cash Flows From Financing Activities
Dividends Paid, Common Stock	(44)	(41)
Proceeds from Term Loan Facility	0	1,400
Repayment of Senior Notes	0	(1,383)
Other	(22)	(38)
Net Cash Used in Financing Activities	(66)	(62)
Decrease in Cash and Cash Equivalents	(393)	(75)
Cash and Cash Equivalents at Beginning of Period	1,180	1,028
Cash and Cash Equivalents at End of Period	$ 787	$ 953

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