Acquisitions and Divestitures - Divestitures (Details 1) - Mexico $ in Millions	3 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Mar. 31, 2016 payment	Sep. 13, 2011 payment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Number of Installment Payments | payment				3
First Installment received from the sale of land in Mexico | $		$ 24
Second Installment received from the sale of land in Mexico | $	$ 36
Disposal Group, Number of Installment Payments Received to Date | payment			2