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Financial Instruments at Fair Value Through Profit or Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Financial Instruments At Fair Value Through Profit Or Loss [Abstract] |
Summary of Financial Instruments at Fair Value through Profit or Loss |
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Financial assets-current |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Derivatives (not designated for hedge) |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 2 |
Non-derivatives |  |  |  |  |  |  |  |
Listed stocks - domestic |  |  | 1 |  |  |  | 8 |
|  | $ | 1 |  |  | $ | 10 |
Financial assets-noncurrent |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Non-derivatives |  |  |  |  |  |  |  |
Non-listed stocks - domestic |  | $ | 511 |  |  | $ | 441 |
Non-listed stocks - foreign |  |  | 267 |  |  |  | 236 |
|  | $ | 778 |  |  | $ | 677 |
Financial liabilities-current |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Derivatives (not designated for hedge) |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | — |
Disclosure of Detailed Information Outstanding Derivative Contracts Not Designated for Hedge Explanatory | Outstanding forward exchange contracts not designated for hedge as of balance sheet dates were as follows:
|  |  |  | Maturity |  | Contract Amount
|  | Currency |  | Period |  | (In Millions)
December 31, 2019 |  |  |  |  |  |
Forward exchange contracts - buy |  | NT$/EUR |  | 2020.03 |  | NT$51/EUR2
Forward exchange contracts - buy |  | NT$/US$ |  | 2020.01 |  | NT$26/US$1
December 31, 2020 |  |  |  |  |  |
Forward exchange contracts - buy |  | NT$/EUR |  | 2021.03 |  | NT$50/EUR2
Forward exchange contracts - sell |  | US$/NT$ |  | 2021.02-03 |  | US$14/NT379

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