Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities
Net Income Including Noncontrolling Interests	$ 574	$ 47
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	468	528
Asset Impairments	168	0
Deferred Income Tax Benefit	(157)	0
Loss (Gain) on Commodity Derivative Instruments	79	(110)
Net Cash (Paid) Received in Settlement of Commodity Derivative Instruments	(28)	3
Gain on Divestitures	(588)	0
Other Adjustments for Noncash Items Included in Income	(2)	20
Changes in Operating Assets and Liabilities
Decrease in Accounts Receivable	89	59
(Decrease) Increase in Accounts Payable	(33)	45
Increase (Decrease) in Current Income Taxes Payable	14	(23)
Other Current Assets and Liabilities, Net	(18)	(35)
Other Operating Assets and Liabilities, Net	17	2
Net Cash Provided by Operating Activities	583	536
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(787)	(587)
Acquisitions, Net of Cash Acquired	(650)	(346)
Proceeds from Divestitures	70	40
Proceeds from Sale of 7.5% Interest in Tamar Field	(487)	0
Proceeds from Sale of CONE Gathering LLC	308	0
Net Cash Used in Investing Activities	(572)	(893)
Cash Flows From Financing Activities
Dividends Paid, Common Stock	(48)	(44)
Purchase and Retirement of Common Stock	(67)	0
Proceeds from Noble Midstream Services Revolving Credit Facility	405	0
Repayment of Noble Midstream Services Revolving Credit Facility	(55)	0
Contributions from Noncontrolling Interest and Other	333	0
Proceeds from Revolving Credit Facility	245	0
Repayment of Revolving Credit Facility	(475)	0
Other	(40)	(22)
Net Cash Provided by (Used in) by Financing Activities	298	(66)
Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	309	(423)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	713	1,210
Cash, Cash Equivalents, and Restricted Cash at End of Period	$ 1,022	$ 787