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Committments and Contingent Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual | $ 14 | $ 10 |
Loss Contingency Accrual, Period Increase (Decrease) | (2) | 0 |
Loss Contingency, Accrual, Current | 1 | 2 |
Loss Contingency, Accrual, Noncurrent | 13 | 8 |
SEC Schedule, 12-09, Reserve, Environmental Cost [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual | 13 | 10 | $ 11
Loss Contingency Accrual, Period Increase (Decrease) | (2) | (1) |
Payments for Environmental Liabilities | 1 | 1 |
Hardboard Siding Reserves |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual | 0 | 0 |
Environmental Reserves |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual | $ 14 | $ 10 |

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