Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Current	$ 37	$ 110	$ 138	$ 145
Deferred	74	98	174	152
Total Income Tax Provision	111	208	312	297
Effective Tax Rate (in hundredths)	40.00%	30.00%	31.00%	29.00%
Increase in the valuation allowance	32			16
Income Tax Expense Associated with Uncertain Tax Positions	$ 10		$ 23
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