Goodwill and Other Intangible Assets Other Intangible Assets Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 99,000,000	$ 92,000,000	$ 86,000,000
Future amortization expense, 2016	98,000,000
Future amortization expense, 2017	98,000,000
Future amortization expense, 2018	82,000,000
Future amortization expense, 2019	76,000,000
Future amortization expense, 2020	67,000,000
Intangible asset impairments	$ 0	$ 0	$ 0