Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities
Net Loss Including Noncontrolling Interests	$ (1,451)	$ (602)
Adjustments to Reconcile Net Loss to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	1,031	1,239
Loss on Marcellus Shale Upstream Divestiture	2,322	0
Deferred Income Tax Benefit	(873)	(414)
Dry Hole Cost	0	114
Gain on Extinguishment of Debt	0	(80)
(Gain) Loss on Commodity Derivative Instruments	(167)	107
Net Cash Received in Settlement of Commodity Derivative Instruments	14	322
Stock Based Compensation	67	40
Other Adjustments for Noncash Items Included in Income	33	95
Changes in Operating Assets and Liabilities
Increase in Accounts Receivable	(123)	(6)
Increase (Decrease) in Accounts Payable	120	(232)
Decrease in Current Income Taxes Payable	(42)	(51)
Other Current Assets and Liabilities, Net	(42)	(51)
Other Operating Assets and Liabilities, Net	(12)	(41)
Net Cash Provided by Operating Activities	877	440
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(1,215)	(812)
Proceeds from Marcellus Shale Upstream Divestiture	1,028	0
Clayton Williams Energy Acquisition	(616)	0
Other Acquisitions	(321)	0
Additions to Equity Method Investments	(68)	(6)
Proceeds from Divestitures and Other	101	767
Net Cash Used in Investing Activities	(1,091)	(51)
Cash Flows From Financing Activities
Dividends Paid, Common Stock	(92)	(86)
Proceeds from Noble Midstream Services Revolving Credit Facility	195	0
Repayment of Noble Midstream Services Revolving Credit Facility	(5)	0
Proceeds from Term Loan Facility	0	1,400
Issuance of Noble Midstream Partners Common Units, Net of Offering Costs	138	0
Proceeds from Revolving Credit Facility	1,310	0
Repayment of Revolving Credit Facility	(1,310)	0
Repayment of Clayton Williams Energy Long-term Debt	(595)	0
Repayment of Senior Notes	0	(1,383)
Other	(67)	(48)
Net Cash Used in Financing Activities	(426)	(117)
(Decrease) Increase in Cash and Cash Equivalents	(640)	272
Cash and Cash Equivalents at Beginning of Period	1,180	1,028
Cash and Cash Equivalents at End of Period	$ 540	$ 1,300