Segment Data - Revenues by Geographic Areas (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 3,198	$ 3,120	$ 9,252	$ 7,222
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	1,735	1,693	5,145	3,437
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 1,463	$ 1,427	$ 4,107	$ 3,785