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.

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

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Plant Closures (Details) - USD ($)	3 Months Ended		12 Months Ended	57 Months Ended
Plant Closures (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Accelerated depreciation				$ 659,000,000
Depreciation expense	$ 452,000,000	$ 466,000,000
Accumulated additional depreciation		$ 36,000,000
Cumberland
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 16,000,000
Accumulated additional depreciation			$ 64,000,000