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Plant Closures (Details) - USD ($)	3 Months Ended		9 Months Ended		18 Months Ended	57 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Accelerated depreciation						$ 659,000,000
Depreciation expense	$ 463,000,000	$ 482,000,000	$ 1,400,000,000	$ 1,400,000,000
Accumulated additional depreciation		$ 37,000,000		$ 110,000,000
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Dispositions	4 million	3 million	11 million
Cumberland
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 16,000,000
Accumulated additional depreciation					$ 96,000,000

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- Definition

Accelerated depreciation

+ References

No definition available.

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- Definition

Accumulated additional depreciation

+ References

No definition available.

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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

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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
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480091/360-10-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

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