Property, Equipment and Technology, Net - Summary of Property, Equipment and Technology, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 8,881	$ 7,674
Accumulated depreciation and amortization	(5,658)	(4,959)
Property, equipment and technology, net	3,223	2,715
Land
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	72	72
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	1,003	1,008
Furniture, equipment and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	2,230	2,048
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	285	226
Technology
Property, Plant and Equipment [Line Items]
Total property, equipment and technology	$ 5,291	$ 4,320