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Plant Closures (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Disposals | $ 3,000,000 | $ 6,000,000 | $ 11,000,000 | $ 17,000,000 |
Accelerated depreciation | 37,000,000 | 35,000,000 | 110,000,000 | 105,000,000 | $ 592,000,000
Depreciation expense | 482,000,000 | $ 459,000,000 |  | $ 1,400,000,000 |
Cumberland |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Accelerated depreciation | $ 16,000,000 |  | $ 32,000,000 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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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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