Employee Benefit Plans - Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
U.S. Pension Benefits [Member]
Employee Benefit Plans [Line Items]
Service cost	$ 1	$ 1	$ 2	$ 4
Interest cost	2	1	6	4
Expected return on plan assets	(3)	(2)	(8)	(6)
Amortization of prior service credit
Amortization of actuarial loss		1		2
Net periodic benefit cost		1		4
Foreign Pension Benefits [Member]
Employee Benefit Plans [Line Items]
Service cost	2	2	7	7
Interest cost	4	4	12	11
Expected return on plan assets	(5)	(4)	(15)	(13)
Amortization of prior service credit
Amortization of actuarial loss	1	1	3	3
Net periodic benefit cost	2	3	7	8
U. S. Postretirement Benefits [Member]
Employee Benefit Plans [Line Items]
Service cost
Interest cost	1		2	1
Expected return on plan assets
Amortization of prior service credit	(1)		(2)	(2)
Amortization of actuarial loss
Net periodic benefit cost				(1)
Foreign Postretirement Benefits [Member]
Employee Benefit Plans [Line Items]
Service cost	0	0
Interest cost	1	1	1	1
Expected return on plan assets	0	0
Amortization of prior service credit	0	0
Amortization of actuarial loss	0	0
Net periodic benefit cost	$ 1	$ 1	$ 1	$ 1