SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 87	$ 87	$ 250
Impairments	0	0	(163)
Goodwill, Ending Balance	87	87	87
Egypt
Goodwill [Roll Forward]
Goodwill, Beginning Balance	87	87	87
Impairments	0	0	0
Goodwill, Ending Balance	87	87	87
North Sea
Goodwill [Roll Forward]
Goodwill, Beginning Balance	0	0	163
Impairments	0	0	(163)
Goodwill, Ending Balance	$ 0	$ 0	$ 0