Retirement Benefit Obligations - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	$ 476	$ 435
Prior service cost (benefit)	(16)	(28)
Net amounts recognized	460	407
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	142	126
Prior service cost (benefit)	0	0
Net amounts recognized	142	126
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	333	316
Prior service cost (benefit)	9	0
Net amounts recognized	342	316
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	1	(7)
Prior service cost (benefit)	(25)	(28)
Net amounts recognized	$ (24)	$ (35)