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Commitments and Contingent Liabilities Litigation - Other PFOA Matters / Fayatteville (Details)
 12 Months Ended
Dec. 31, 2020
lawsuits
Firefighting Foam [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 900
Firefighting Foam [Member] | Personal injury cases [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 725
NORTH CAROLINA | PFOA Matters: Drinking Water Actions [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Number of Additional Plaintiffs 100
Loss Contingency, Number of Property Owners 100
NEW YORK | PFOA Matters: Drinking Water Actions [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 50
NEW JERSEY | PFOA Matters: Drinking Water Actions [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 2
NEW JERSEY | Natural Resources Damages [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 4
OHIO | PFOA Matters: Drinking Water Actions [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 3