PROPERTY AND EQUIPMENT, NET (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Gross carrying value	$ 1,458	$ 1,353
Accumulated depreciation/ software amortization	(955)	(854)
Property and equipment, net	503	499
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	660	606
Accumulated depreciation/ software amortization	(422)	(362)
Property and equipment, net	238	244
Amortization expense	62	62	$ 54
Buildings, building components, leasehold and land improvements
Property, Plant and Equipment [Line Items]
Gross carrying value	413	397
Accumulated depreciation/ software amortization	(239)	(225)
Property and equipment, net	174	172
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Gross carrying value	356	321
Accumulated depreciation/ software amortization	(294)	(267)
Property and equipment, net	62	54
Property and equipment
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 50	$ 51	$ 52

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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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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