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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Land and Land Improvements	$ 172	$ 168
Buildings	356	350
Machinery and equipment	1,971	1,965
Construction in progress	63	46
Property, Plant and Equipment, Gross	2,562	2,529
Accumulated depreciation	(1,644)	(1,564)
Property, Plant and Equipment, Net	918	965
Timber [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 18	$ 25

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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 deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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