Retirement Benefit Obligations - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	$ 594	$ 612
Prior service (benefit) cost	(31)	(34)
Net amounts recognized	563	578
Domestic Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	142	158
Prior service (benefit) cost	0	0
Net amounts recognized	142	158
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	453	452
Prior service (benefit) cost	0	0
Net amounts recognized	453	452
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	(1)	2
Prior service (benefit) cost	(31)	(34)
Net amounts recognized	$ (32)	$ (32)