Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Examination [Line Items]
Current	$ 20	$ 10
Deferred	(186)	(30)
Total Income Tax Benefit	$ (166)	$ (20)
Effective Tax Rate	36.60%	47.60%
US
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2012
Equatorial Guinea
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2010
Israel
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2011