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10-K Commitments and Contingencies - Environmental matters (Details)
 1 Months Ended
Dec. 31, 2020
USD ($)
responsibleParty
Feb. 28, 2021
Jan. 31, 2017
USD ($)
Other Commitments [Line Items]      
Number of other responsible parties | responsibleParty 100    
Environmental remediation period (in years)     13 years
Environmental remediation, estimated present value of expected costs     $ 1,000,000,000
Environmental remediation, percent of site to be remediated   1  
Lower Willamette Group      
Other Commitments [Line Items]      
Incurred investigation related costs (over) $ 115,000,000