Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Tax Disclosure [Abstract]
Current	$ 56	$ 39	$ 100	$ 36
Deferred	59	48	100	54
Total Income Tax Provision	115	87	200	90
Effective Tax Rate (in hundredths)	29.00%	24.00%	28.00%	28.00%
Increase in the valuation allowance			$ 13	$ 14
US
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2008
Equatorial Guinea
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2007
Israel
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2008
UK
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2010
Netherlands
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2009
China
Years Remaining Open to Examination [Abstract]
Earliest years remaining open to examinations			2006