Retirement Benefit Obligations - Schedule of Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Component of Net Periodic Benefit Cost (Detail) $ in Millions	Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	$ 14
Prior service (benefit) cost	(3)
Net amounts recognized	11
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	4
Prior service (benefit) cost	0
Net amounts recognized	4
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	10
Prior service (benefit) cost	0
Net amounts recognized	10
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses (gains)	0
Prior service (benefit) cost	(3)
Net amounts recognized	$ (3)