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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) | Mar. 31, 2019 KRW (₩) T / mo | Mar. 31, 2019 USD ($) T / mo
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Contracts not designated as hedging instruments | USD/CNY | Foreign Exchange Forward |  |
Derivative [Line Items] |  |
Notional Values of Foreign Currency Derivatives | $ |  | $ 17,470,003
Contracts not designated as hedging instruments | KRW/USD | Foreign Exchange Forward |  |
Derivative [Line Items] |  |
Notional Values of Foreign Currency Derivatives | ₩ | ₩ 4,539,600,000 |
Contract designated as hedging instrument | April 2019 - June 2019 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 188 | 188
Contract designated as hedging instrument | July 2019 - September 2019 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 191 | 191
Contract designated as hedging instrument | October 2019 - December 2019 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 195 | 195
Contract designated as hedging instrument | January 2020 - March 2020 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 202 | 202
Contract designated as hedging instrument | April 2020 - June 2020 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 134 | 134

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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