Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Loss	Treasury Stock at Cost	Retained Earnings	Non- controlling Interests
Balance at Beginning of Period at Dec. 31, 2015	$ 10,370	$ 5	$ 6,360	$ (33)	$ (688)	$ 4,726	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/Loss	(602)	0	0	0	0	(602)	0
Stock-based Compensation	36	0	36	0	0	0	0
Dividends (20 cents per share)	(86)	0	0	0	0	(86)	0
Other	(5)	0	2	1	(8)	0	0
Balance at End of Period at Jun. 30, 2016	9,713	5	6,398	(32)	(696)	4,038	0
Balance at Beginning of Period at Dec. 31, 2016	9,600	5	6,450	(31)	(692)	3,556	312
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income/Loss	(1,451)	0	0	0	0	(1,476)	25
Clayton Williams Energy Acquisition	1,851	0	1,876	0	(25)	0	0
Stock-based Compensation	65	0	65	0	0	0	0
Dividends (20 cents per share)	(92)	0	0	0	0	(92)	0
Issuance of Noble Midstream Partners Common Units, Net of Offering Costs	138	0	0	0	0	0	138
Distributions to Noncontrolling Interest Owners	(12)	0	0	0	0	0	(12)
Other	(1)	0	8	1	(10)	0	0
Balance at End of Period at Jun. 30, 2017	$ 10,098	$ 5	$ 8,399	$ (30)	$ (727)	$ 1,988	$ 463