Goodwill and Other Intangible Assets - Other Intangible Assets Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 26	$ 24	$ 74	$ 70
Future amortization expense, 2017	104		104
Future amortization expense, 2018	102		102
Future amortization expense, 2019	86		86
Future amortization expense, 2020	77		77
Future amortization expense, 2021	$ 67		$ 67