Legal Matters and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 Year Entity Location Person
Legal Matters and Contingencies (Textual) [Abstract]
Number of French companies for investigation	170
Number of participants in U.N Oil-for-Food Program	93
Number of foreign subsidiaries	2
Number of global sites included in process	40
Approximate agreed payment of combined civil penalty	$ 3
Number of former public waste disposal sites	6