Legal Matters and Contingencies (Details)	12 Months Ended
	Dec. 31, 2014 site
Loss Contingencies [Line Items]
Number of former public waste disposal sites	5
Oil-for-Food Program
Loss Contingencies [Line Items]
Number of French companies for investigation	170
Number of our French companies for investigation	1
Number of participants in U.N Oil-for-Food Program	93
Number of foreign subsidiaries	2