Contingencies And Guarantees (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 31, 2011	Jun. 30, 2011
Contingencies And Guarantees [Abstract]
Liability for future remediation costs	$ 15	$ 15
Percentage of liability for aggregate remediation and associated costs, other than legal fees	24.30%
Remediation period, years	30
Letters of credit related to insurance carriers	$ 15