Retirement Benefit Obligations - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 117	$ 135
Other current liabilities	(10)	(10)
Retirement benefit obligations	(266)	(245)
Net amount recognized	(159)	(120)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	0	0
Retirement benefit obligations	(87)	(74)
Net amount recognized	(87)	(74)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	117	135
Other current liabilities	(2)	(1)
Retirement benefit obligations	(78)	(74)
Net amount recognized	37	60
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	(8)	(9)
Retirement benefit obligations	(101)	(97)
Net amount recognized	$ (109)	$ (106)