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Summary of Significant Accounting Policies Property, Plant, and equipment (Tables) | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment [Table Text Block] | Property, plant, and equipment, including capitalized interest, are recorded at cost and consisted of the following:
Dollar amounts in millions | December 31,
2019 |  | 2018
Property, plant, and equipment, at cost: |  |  |
Land, land improvements, and logging roads, net of road amortization | $ | 168 |  |  | $ | 169 |
Buildings | 350 |  |  | 330 |
Machinery and equipment | 1,965 |  |  | 1,949 |
Construction in progress | 46 |  |  | 148 |
| 2,529 |  |  | 2,596 |
Accumulated depreciation | (1,564 | ) |  | (1,586 | )
Property, plant, and equipment, net | $ | 965 |  |  | $ | 1,010 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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