Retirement Benefit Obligations - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 94	$ 117
Other current liabilities	(11)	(10)
Retirement benefit obligations	(277)	(266)
Net amount recognized	(194)	(159)
Domestic
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	0	0
Retirement benefit obligations	(95)	(87)
Net amount recognized	(95)	(87)
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	94	117
Other current liabilities	(2)	(2)
Retirement benefit obligations	(82)	(78)
Net amount recognized	10	37
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	(9)	(8)
Retirement benefit obligations	(100)	(101)
Net amount recognized	$ (109)	$ (109)