Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Loss	Treasury Stock at Cost	Retained Earnings	Non-controlling Interests
Shareholders Equity, Beginning Balance at Dec. 31, 2013	$ 9,184	$ 4	$ 3,463	$ (117)	$ (659)	$ 6,493
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	1,214	0	0	0	0	1,214
Stock-based Compensation	87	0	87	0	0	0
Exercise of Stock Options	48	0	48	0	0	0
Tax Benefits Related to Exercise of Stock Options	19	0	19	0	0	0
Dividends	(249)	0	0	0	0	(249)
Net Change in Other	22	0	7	27	(12)	0
Shareholders Equity, Ending Balance at Dec. 31, 2014	10,325	4	3,624	(90)	(671)	7,458
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(2,441)	0		0	0	(2,441)
Rosetta Merger	1,529	1	1,528	0	0	0
Stock-based Compensation	86	0	86	0	0	0
Exercise of Stock Options	8	0	8	0	0	0
Tax Benefits Related to Exercise of Stock Options	(1)	0	(1)	0	0	0
Dividends	(291)	0		0	0	(291)
Rabbi Trust Shares Sold	1,112	0	1,112	0	0	0
Net Change in Other	43	0	3	57	(17)	0
Shareholders Equity, Ending Balance at Dec. 31, 2015	10,370	5	6,360	(33)	(688)	4,726
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(985)	0	0	0	0	(998)	$ 13
Stock-based Compensation	68	0	68	0	0	0
Exercise of Stock Options	24	0	24	0	0	0
Tax Benefits Related to Exercise of Stock Options	(6)	0	(6)	0	0	0
Dividends	(172)	0	0	0	0	(172)
Issuance of Noble Midstream Partners Common Units, Net of Offering Costs	299	0	0	0	0	0	299
Net Change in Other	2	0	4	2	(4)	0
Shareholders Equity, Ending Balance at Dec. 31, 2016	$ 9,600	$ 5	$ 6,450	$ (31)	$ (692)	$ 3,556	$ 312