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Contingencies and Commitments - Environmental Matters (Details)
€ in Millions, $ in Millions
12 Months Ended
Jun. 06, 2019
plaintiff
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
Loss Contingencies [Line Items]            
Number of cleanup locations (more than) | segment   30        
Remediation reserve balance     $ 8   $ 10  
Remediation reserve balance, classified as a current liability     3   5  
Payments related to remediation expenses applied against the reserve   $ 2 $ 3      
Total combined assessments       € 54 $ 64  
Number of plaintiffs | plaintiff 247          
Monetary damages sought 75,000          
Spain            
Loss Contingencies [Line Items]            
Income taxes receivable | €       € 53    
Tax agreement, indemnification of ultimate liability, percent       33.66% 33.66% 49.00%
Recurring Costs of Managing Hazardous Substances and Environmental Programs | Maximum            
Loss Contingencies [Line Items]            
Percentage of cost of goods sold   1.00%        
Alcoa Corporation            
Loss Contingencies [Line Items]            
Tax agreement, indemnification of ultimate liability, percent       49.00% 49.00%  
Arconic Corporation            
Loss Contingencies [Line Items]            
Tax agreement, indemnification of ultimate liability, percent       33.66% 33.66%  
Euro | Spain            
Loss Contingencies [Line Items]            
Income taxes receivable | €       € 45