PROPERTY AND EQUIPMENT, NET (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Gross carrying value	$ 1,353	$ 1,294
Accumulated depreciation/ software amortization	(854)	(759)
Property and equipment, net	499	535
Land
Property, Plant and Equipment [Line Items]
Gross carrying value	29	29
Accumulated depreciation/ software amortization	0	0
Property and equipment, net	29	29
Software, including development in progress
Property, Plant and Equipment [Line Items]
Gross carrying value	606	565
Accumulated depreciation/ software amortization	(362)	(302)
Property and equipment, net	244	263
Amortization expense	62	54	$ 49
Buildings, building components, leasehold and land improvements
Property, Plant and Equipment [Line Items]
Gross carrying value	397	406
Accumulated depreciation/ software amortization	(225)	(215)
Property and equipment, net	172	191
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Gross carrying value	321	294
Accumulated depreciation/ software amortization	(267)	(242)
Property and equipment, net	54	52
Property and equipment
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 51	$ 52	$ 48

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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