Commitments and Contingent Liabilities (Details) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2013 PRP site [Member] USD ($)	Mar. 31, 2013 Non- PRP sites [Member] USD ($)	Mar. 31, 2013 Indemnification Agreement [Member] USD ($)	Mar. 31, 2013 Property Lease Guarantee [Member] USD ($)	Mar. 31, 2013 Foreign Tax Authority [Member] Italian Subsidiaries (Member) USD ($)	Mar. 31, 2013 Foreign Tax Authority [Member] Italian Subsidiaries (Member) EUR (€)	Mar. 31, 2013 Foreign Tax Authority [Member] Potential Penalties [Member] Italian Subsidiaries (Member) USD ($)	Mar. 31, 2013 Foreign Tax Authority [Member] Potential Penalties [Member] Italian Subsidiaries (Member) EUR (€)	Mar. 31, 2013 Foreign Tax Authority [Member] Favorable Court Ruling [Member] Italian Subsidiaries (Member) Court_ruling	Mar. 31, 2013 Foreign Tax Authority [Member] Unfavorable Court Ruling [Member] Italian Subsidiaries (Member) Court_ruling
Commitments And Contingent Liabilities [Line Items]
Estimated future remediation costs	$ 6	$ 7
Loss Contingency, Damages Sought, Value					33	26	56	44
Maximum potential costs related to indemnification agreements for properties sold and businesses divested									1	2
Litigation Settlement, Gross					9	7
Loss Contingency Accrual, at Carrying Value					13
Loss Contingency, Range of Possible Loss, Maximum			9
Guarantees related to residual values of leased assets				$ 37