Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Third party contributions made to pension plans	$ 37
Pension and Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions made to various plans	4	11
Retiree Medical Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Reduction in Retirement benefit obligation due to changes made in defined benefit pension and retiree medical plans	$ 41