Comprehensive (Loss) Income - Schedule of Accumulated Other Comprehensive Income Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Comprehensive Income Loss [Line Items]
Beginning balance	$ (59)
Activity through December 31, 2012	2
Ending balance	(57)
Foreign Currency Translation Loss [Member]
Comprehensive Income Loss [Line Items]
Beginning balance	(54)
Activity through December 31, 2012	2
Ending balance	(52)
Minimum Pension Liability [Member]
Comprehensive Income Loss [Line Items]
Beginning balance	(6)
Activity through December 31, 2012
Ending balance	(6)
Deferred Gains On Derivative Financial Instruments [Member]
Comprehensive Income Loss [Line Items]
Beginning balance	1
Activity through December 31, 2012
Ending balance	$ 1