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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Details) | Sep. 30, 2019 KRW (₩) T / mo | Sep. 30, 2019 USD ($) T / mo
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Contracts not designated as hedging instruments | USD/CNY | Foreign Currency Derivatives |  |
Derivative [Line Items] |  |
Notional Values of Foreign Currency Derivatives | $ |  | $ 6,506,000
Contracts not designated as hedging instruments | KRW/USD | Foreign Currency Derivatives |  |
Derivative [Line Items] |  |
Notional Values of Foreign Currency Derivatives | ₩ | ₩ 5,979,000,000 |
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) | 202 | 202
Contract designated as hedging instrument | July 2020 - September 2020 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 201 | 201
Contract designated as hedging instrument | October 2020 - December 2020 |  |
Derivative [Line Items] |  |
Volume of Copper Derivatives (in metric tons per month) | 201 | 201

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