Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of other intangible assets	$ 19	$ 17	$ 57	$ 42
Future amortization expense, 2014	87		87
Future amortization expense, 2015	83		83
Future amortization expense, 2016	73		73
Future amortization expense, 2017	66		66
Future amortization expense, 2018	$ 57		$ 57