Property, Equipment and Technology, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 4,798	$ 4,283
Accumulated depreciation and amortization	(2,648)	(2,395)
Property, equipment and technology, net	2,150	1,888
Land
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	74	71
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	839	803
Furniture, equipment and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	1,382	1,267
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	125	120
Technology
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 2,378	$ 2,022