Employee Benefit Plans - Net Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (174)	$ (149)
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	(6)	(15)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	4	4
Current liabilities	(1)	(1)
Noncurrent liabilities	(106)	(67)
U. S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(5)	(5)
Noncurrent liabilities	(45)	(50)
Foreign Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (17)	$ (17)