Retirement Benefit Obligations - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 120	$ 94
Other current liabilities	(11)	(11)
Retirement benefit obligations	(211)	(277)
Net amount recognized	(102)	(194)
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	(1)	0
Retirement benefit obligations	(53)	(95)
Net amount recognized	(54)	(95)
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	120	94
Other current liabilities	(2)	(2)
Retirement benefit obligations	(80)	(82)
Net amount recognized	38	10
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	(8)	(9)
Retirement benefit obligations	(78)	(100)
Net amount recognized	$ (86)	$ (109)