Supplemental Financial Information - Property, Plant and Equipment, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Land	$ 137	$ 166
Buildings	3,264	3,082
Machinery, equipment and fixtures	9,301	8,454
Leasehold improvements	241	216
Property, Plant and Equipment, gross	12,942	11,919
Less accumulated depreciation and amortization	6,549	5,996
Property, Plant and Equipment, Net	$ 6,393	$ 5,923

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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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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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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