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 (₩)
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