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Significant Assets and Liabilities Denominated in Foreign Currencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Text block [abstract] |
Summary of Significant Assets and Liabilities Denominated in Foreign Currencies | The significant financial assets and liabilities denominated in foreign currencies were as follows:
|  | Foreign Currencies (In Thousand) |  | Exchange Rate |  | Carrying Amount (In Thousand)
December 31, 2018 |  |  |  |  |  |
Monetary financial assets |  |  |  |  |  |  |  |  |  |  |  |
US$ |  | $ | 3,730,484 |  |  |  | US$1=NT$30.715 |  |  | $ | 114,581,814 |
US$ |  |  | 1,299,391 |  |  |  | US$1=CNY6.8632 |  |  |  | 39,910,801 |
JPY |  |  | 4,412,591 |  |  |  | JPY1=NT$0.2782 |  |  |  | 1,227,583 |
JPY |  |  | 6,568,657 |  |  |  | JPY1=US$0.0091 |  |  |  | 1,827,400 |
Monetary financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
US$ |  |  | 3,361,523 |  |  |  | US$1=NT$30.715 |  |  |  | 103,249,185 |
US$ |  |  | 1,216,654 |  |  |  | US$1=CNY6.8632 |  |  |  | 37,369,521 |
JPY |  |  | 7,401,621 |  |  |  | JPY1=NT$0.2782 |  |  |  | 2,059,131 |
JPY |  |  | 7,035,704 |  |  |  | JPY1=US$0.0091 |  |  |  | 1,957,333 |
December 31, 2019 |  |  |  |  |  |
Monetary financial assets |  |  |  |  |  |  |  |  |  |  |  |
US$ |  |  | 4,125,872 |  |  |  | US$1=NT$29.98 |  |  |  | 123,693,628 |
US$ |  |  | 1,189,539 |  |  |  | US$1=CNY6.9762 |  |  |  | 35,662,384 |
JPY |  |  | 13,889,872 |  |  |  | JPY1=NT$0.2760 |  |  |  | 3,833,605 |
JPY |  |  | 771,392 |  |  |  | JPY1=US$0.0092 |  |  |  | 212,904 |
Monetary financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
US$ |  |  | 3,823,359 |  |  |  | US$1=NT$29.98 |  |  |  | 114,624,313 |
US$ |  |  | 1,211,472 |  |  |  | US$1=CNY6.9762 |  |  |  | 36,319,926 |
JPY |  |  | 14,628,543 |  |  |  | JPY1=NT$0.2760 |  |  |  | 4,037,478 |
JPY |  |  | 815,929 |  |  |  | JPY1=US$0.0092 |  |  |  | 225,197 |
Summary of Realized and Unrealized Foreign Exchange Gain (Loss) | The significant realized and unrealized foreign exchange gain (loss) were as follows:
|  | For the Year Ended December 31
|  | 2017 |  | 2018 |  | 2019
Functional Currencies |  | Exchange Rate |  | Net Foreign Exchange Gain (Loss) |  | Exchange Rate |  | Net Foreign Exchange Loss |  | Exchange Rate |  | Net Foreign Exchange Gain (Loss)
|  |  |  | NT$ |  |  |  | NT$ |  |  |  | NT$ |  | US$ (Note 4)
US$ |  |  | US$1=NT$29.76 |  |  | $ | (244,802 | ) |  |  | US$1=NT$30.715 |  |  | $ | (67,476 | ) |  |  | US$1=NT$29.98 |  |  | $ | (84,177 | ) |  | $ | (2,814 | )
NT$ |  |  |  |  |  |  | 4,130,243 |  |  |  |  |  |  |  | (849,234 | ) |  |  |  |  |  |  | 1,203,823 |  |  |  | 40,248 |
CNY |  |  | CNY1=NT$4.5545 |  |  |  | (337,630 | ) |  |  | CNY1=NT$4.4753 |  |  |  | (120,005 | ) |  |  | CNY1=NT$4.2975 |  |  |  | 14,055 |  |  |  | 470 |
|  |  |  |  |  | $ | 3,547,811 |  |  |  |  |  |  | $ | (1,036,715 | ) |  |  |  |  |  | $ | 1,133,701 |  |  | $ | 37,904 |

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