Pensions and Other Postretirement Benefits - Additional Information (Detail) (Pension Expense [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012
Pension Expense [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment benefit to cease all future contributions under the Cash Balance formula and freeze the Plan	$ 27