Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Examination [Line Items]
Current	$ 12	$ 20
Deferred		(186)
Total Income Tax Provision (Benefit)	$ 12	$ (166)
Effective Tax Rate	20.30%	36.60%
US
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2013
Equatorial Guinea
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2011
Israel
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2015