Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Loss Including Noncontrolling Interests	$ (1,050)	$ (985)	$ (2,441)
Other Items of Comprehensive Loss
Net Change in Mutual Fund Investment	0	0	(11)
Less Tax Expense	0	0	4
Net Change in Pension and Other	3	3	99
Less Tax Benefit	(1)	(1)	(35)
Other Comprehensive Income	2	2	57
Comprehensive Loss Including Noncontrolling Interests	(1,048)	(983)	(2,384)
Less: Comprehensive Income Attributable to Noncontrolling Interests	68	13	0
Comprehensive Loss Attributable to Noble Energy	$ (1,116)	$ (996)	$ (2,384)