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Hedging Transactions and Derivative Financial Instruments (Notional Values of Foreign Currency Derivatives) (Detail) - Dec. 31, 2019 - Not Designated as Hedging Instrument - Foreign Exchange Forward | JPY (¥) | EUR (€) | USD ($) | KRW (₩)
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USD/KRW Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ₩ |  |  |  | ₩ 10,413,450,000
USD/CNY Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | $ |  |  | $ 17,131,000 |
EUR/USD Notional Amount Of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | € |  | € 13,408,000 |  |
JPY/EUR Notional Amount of Foreign Currency Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Values of Foreign Currency Derivatives | ¥ | ¥ 125,000,000 |  |  |

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