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Plant Closures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Property, Plant and Equipment [Abstract] |  |
Accelerated depreciation | $ 387 | $ 566
Completed Plant |  |
Accelerated depreciation | $ 387 | $ 566
Property, Plant and Equipment [Member] |  |
Completed Plant |  |
Property, Plant and Equipment, Dispositions | 11 million | 151 million
Property, Plant and Equipment, Disposals | $ 2 | $ 19

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- Definition Amount of divestiture of long-lived, 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, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Describes an entity's accounting treatment for disposals of property, plant and equipment, including gains and losses related thereto. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125663-122742 + Details
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