Retirement Benefit Obligations - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	$ 435	$ 594
Prior service (benefit) cost	(28)	(31)
Net amounts recognized	407	563
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	126	142
Prior service (benefit) cost	0	0
Net amounts recognized	126	142
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	316	453
Prior service (benefit) cost	0	0
Net amounts recognized	316	453
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	(7)	(1)
Prior service (benefit) cost	(28)	(31)
Net amounts recognized	$ (35)	$ (32)