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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) - Contracts not designated as hedging instruments
Mar. 31, 2021
USD ($)
tons_per_month
Mar. 31, 2021
KRW (₩)
tons_per_month
Mar. 31, 2021
EUR (€)
tons_per_month
April 2021 - June 2021      
Derivative [Line Items]      
Volume of Copper Derivatives (in metric tons per month) 256 256 256
July 2021 - September 2021      
Derivative [Line Items]      
Volume of Copper Derivatives (in metric tons per month) 222 222 222
October 2021 - December 2021      
Derivative [Line Items]      
Volume of Copper Derivatives (in metric tons per month) 222 222 222
January 2022 - March 2022      
Derivative [Line Items]      
Volume of Copper Derivatives (in metric tons per month) 213 213 213
USD/CNH | Foreign Currency Derivatives      
Derivative [Line Items]      
Notional Values of Foreign Currency Derivatives | $ $ 20,477,033    
KRW/USD | Foreign Currency Derivatives      
Derivative [Line Items]      
Notional Values of Foreign Currency Derivatives | ₩   ₩ 11,317,100,000  
EUR/USD | Foreign Currency Derivatives      
Derivative [Line Items]      
Notional Values of Foreign Currency Derivatives | €     € 6,788,458