Goodwill and Other Intangible Assets Other Intangible Assets Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 86	$ 75	$ 56
Future amortization expense, 2015	95
Future amortization expense, 2016	90
Future amortization expense, 2017	86
Future amortization expense, 2018	83
Future amortization expense, 2019	$ 77