Committments and Contingent Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 10	$ 11
Loss Contingency, Accrual, Current	2	2
Loss Contingency, Accrual, Noncurrent	8	9
SEC Schedule, 12-09, Reserve, Environmental Cost [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	10	11	$ 15
Loss Contingency Accrual, Period Increase (Decrease)	(1)	2
Payments for Environmental Liabilities	1	2
Accrual for Environmental Loss Contingencies, Foreign Currency Translation Gain (Loss)	0	0
Hardboard Siding Reserves
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 0	$ 0