Employee Benefit Plans - Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1
Expected return on plan assets	(3)	(3)
Net periodic benefit (credit) cost	(2)	(2)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2
Interest cost	1	2
Expected return on plan assets	(3)	(3)
Amortization of actuarial loss	1	1
Net periodic benefit (credit) cost	$ 1	2
U. S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credit		(1)
Settlement and curtailment cost (credit)		(1)
Net periodic benefit (credit) cost		$ (2)