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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | $ 30 | $ 16 |
Goodwill, Acquired During Period |  | 0 | 14 |
Asset Impairment Charges |  | (5) |  |
Goodwill |  | 25 | 30 | $ 16
Intangible Assets, Net (Excluding Goodwill) |  | 61 | 51 |
Finite-lived Intangible Assets Acquired |  |  | 15 |
Amortization of Intangible Assets |  | (5) | (5) | (4)
Intangible Assets, Net (Excluding Goodwill) |  | 56 | 61 | 51
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 5 |  |
Licensing Agreements [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  | 38 | 41 |
Finite-lived Intangible Assets Acquired |  |  | 0 |
Amortization of Intangible Assets |  | (4) | (3) |
Intangible Assets, Net (Excluding Goodwill) |  | 34 | 38 | 41
Licensing Agreements [Member] | CANADA |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  | 91 |  |
Technology-Based Intangible Assets [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  | 20 | 10 |
Finite-lived Intangible Assets Acquired |  |  | 12 |
Amortization of Intangible Assets |  | (1) | (2) |
Intangible Assets, Net (Excluding Goodwill) |  | 19 | 20 | 10
Trademarks [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  | 3 | 0 |
Finite-lived Intangible Assets Acquired |  |  | 3 |
Amortization of Intangible Assets |  | 0 | 0 |
Intangible Assets, Net (Excluding Goodwill) |  | 3 | 3 | 0
Siding |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 4 | 0 |
Goodwill, Acquired During Period | $ 4 | 0 | 4 |
Asset Impairment Charges |  | 0 |  |
Goodwill |  | 4 | 4 | 0
OSB |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 16 | 16 |
Goodwill, Acquired During Period |  | 0 | 0 |
Asset Impairment Charges |  | 0 |  |
Goodwill |  | 16 | 16 | 16
Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 10 | 0 |
Goodwill, Acquired During Period |  | 0 | 10 |
Asset Impairment Charges |  | (5) |  |
Goodwill |  | 5 | $ 10 | $ 0
Entreka [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Asset Impairment Charges |  | $ (5) |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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