Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Examination [Line Items]
Current	$ 148	$ (45)	$ 213	$ 64
Deferred	(285)	69		(244)
Total Income Tax (Benefit) Provision	$ (137)	$ 24	$ (486)	$ (180)
Effective Tax Rate	48.90%	(9.30%)	39.50%	30.40%
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			2011