Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 30	$ 16	$ 16
Goodwill, Acquired During Period	14
Intangible Assets, Net (Excluding Goodwill)	61	51	55
Finite-lived Intangible Assets Acquired	15
Amortization of Intangible Assets	(5)	(4)	(3)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	5
Licensing Agreements [Member]
Goodwill [Line Items]
Intangible Assets, Net (Excluding Goodwill)	38	41	44
Finite-lived Intangible Assets Acquired	0
Amortization of Intangible Assets	(3)	(3)
Technology-Based Intangible Assets [Member]
Goodwill [Line Items]
Intangible Assets, Net (Excluding Goodwill)	20	10	11
Finite-lived Intangible Assets Acquired	12
Amortization of Intangible Assets	(2)	(1)
Trademarks [Member]
Goodwill [Line Items]
Intangible Assets, Net (Excluding Goodwill)	3	0	0
Finite-lived Intangible Assets Acquired	3
Amortization of Intangible Assets	0	0
Siding
Goodwill [Line Items]
Goodwill	4	0	0
Goodwill, Acquired During Period	4
OSB
Goodwill [Line Items]
Goodwill	16	16	16
Goodwill, Other Increase (Decrease)	0
Other
Goodwill [Line Items]
Goodwill	10	$ 0	$ 0
Goodwill, Acquired During Period	$ 10

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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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