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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Detail) | Dec. 31, 2017 JPY (¥) T / mo | Dec. 31, 2017 EUR (€) T / mo | Dec. 31, 2017 USD ($) T / mo | Dec. 31, 2017 KRW (₩) T / mo
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Not Designated as Hedging Instrument | Foreign Exchange Forward | USD/KRW Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ₩ |  |  |  | ₩ 4,503,980,000
Not Designated as Hedging Instrument | Foreign Exchange Forward | EUR/CNY Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ₩ |  |  |  | ₩ 1,049,585
Not Designated as Hedging Instrument | Foreign Exchange Forward | JPY/EUR Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ¥ | ¥ 325,000,000 |  |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward | EUR/USD Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | € |  | € 7,068,140 |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward | EUR/HUF Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | € |  | € 563,119 |  |
Not Designated as Hedging Instrument | Foreign Exchange Forward | USD/CNY Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | $ |  |  | $ 12,828,710 |
Designated as Hedging Instrument | Copper, January 2018 - March 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 140 | 140 | 140 | 140
Designated as Hedging Instrument | Copper, April 2018 - June 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 153 | 153 | 153 | 153
Designated as Hedging Instrument | Copper, July 2018 - September 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 153 | 153 | 153 | 153
Designated as Hedging Instrument | Copper, October 2018 - December 2018 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Value of Copper Derivatives | 119 | 119 | 119 | 119

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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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