Employee Benefit Plans (Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
U.S. Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 5	$ 5	$ 5
Interest cost	7	6	7
Expected return on plan assets	(9)	(8)	(9)
Net losses (gains)	1
Settlements or curtailments cost (income)	1
Net periodic benefit cost	5	3	3
Foreign Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	7	6	5
Interest cost	11	11	11
Expected return on plan assets	(13)	(13)	(11)
Net losses (gains)	3	3	2
Settlements or curtailments cost (income)	1		1
Other	(1)	2
Net periodic benefit cost	9	9	8
U. S. Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	1	1	1
Interest cost	2	2	3
Amortization of prior service cost (credit)	(3)	(3)	(4)
Settlements or curtailments cost (income)	(1)
Net periodic benefit cost	(1)
Foreign Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Interest cost	1	1	1
Net periodic benefit cost	$ 1	$ 1	$ 1