Commitments and Contingent Liabilities (Details) In Millions, unless otherwise specified	Mar. 31, 2012 USD ($)	Mar. 31, 2012 PRP site [Member] USD ($)	Mar. 31, 2012 Non- PRP sites [Member] USD ($)	Mar. 31, 2012 Italian Subsidiaries (Member) USD ($)	Mar. 31, 2012 Italian Subsidiaries (Member) EUR (€)
Commitments And Contingent Liabilities [Line Items]
Estimated future remediation costs		$ 6	$ 8
Assessment of VAT				53	40
Maximum potential costs related to indemnification agreements for properties sold and businesses divested	12
Guarantees related to residual values of leased assets	$ 15