Retirement Benefit Obligations - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 135	$ 17
Other current liabilities	(10)	(10)
Retirement benefit obligations	(245)	(319)
Net amount recognized	(120)	(312)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	0	0
Retirement benefit obligations	(74)	(91)
Net amount recognized	(74)	(91)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	135	17
Other current liabilities	(1)	(1)
Retirement benefit obligations	(74)	(120)
Net amount recognized	60	(104)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	0	0
Other current liabilities	(9)	(9)
Retirement benefit obligations	(97)	(108)
Net amount recognized	$ (106)	$ (117)