Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Total	$ 1,273	$ 960	$ 3,789	$ 3,055
Costs and Expenses
Production Expense	273	280	886	866
Exploration Expense	25	64	89	136
Depreciation, Depletion and Amortization	485	523	1,418	1,554
Loss on Marcellus Shale Exit Activities	0	4	0	2,326
Gain on Divestitures, Net	(193)	0	(859)	0
Asset Impairments	0	0	168	0
General and Administrative	107	102	316	304
Other Operating Expense (Income), Net	78	(15)	222	132
Total	775	958	2,240	5,318
Operating Income (Loss)	498	2	1,549	(2,263)
Other (Income) Expense
Loss (Gain) on Commodity Derivative Instruments	155	22	483	(145)
(Gain) Loss on Extinguishment of Debt	0	(98)	3	(98)
Interest, Net of Amount Capitalized	70	88	216	271
Other Non-Operating (Income) Expense, Net	(34)	100	(10)	94
Total	191	210	689	220
Income (Loss) Before Income Taxes	307	(208)	860	(2,483)
Income Tax Expense (Benefit)	59	(93)	44	(917)
Net Income (Loss) and Comprehensive Income (Loss) Including Noncontrolling Interests	248	(115)	816	(1,566)
Less: Net Income and Comprehensive Income Attributable to Noncontrolling Interests	21	21	58	46
Net Income (Loss) and Comprehensive Income (Loss) Attributable to Noble Energy	$ 227	$ (136)	$ 758	$ (1,612)
Net Income (Loss) Attributable to Noble Energy per Common Share
Basic ($ per share)	$ 0.47	$ (0.28)	$ 1.57	$ (3.47)
Diluted ($ per share)	$ 0.47	$ (0.28)	$ 1.56	$ (3.47)
Weighted Average Number of Common Shares Outstanding
Basic (in shares)	482	487	484	464
Diluted (in shares)	484	487	486	464
Oil, NGL and Gas Sales
Revenues
Revenue from Sales	$ 1,136	$ 907	$ 3,409	$ 2,918
Sales of Purchased Oil and Gas and Other
Revenues
Revenue from Sales	$ 137	$ 53	$ 380	$ 137