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Hedging Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Detailed Information About Hedging Instruments [Line Items] |
Summary of Hedging Transaction and Reclassification Affected Comprehensive Income | 2018
|  | Comprehensive Income |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Reclassification from Equity to Profit or Loss and the Adjusted Line Item |
|  | Hedging Gain or Loss |  |  | Amount of Hedge Ineffectiveness |  |  | Line Item in Which Hedge |  |  | Amount Reclassified to P/L and |  |  | Due to Hedged Future Cash Flows No |
Hedge |  | Recognized |  |  | Recognized in |  |  | Ineffectiveness |  |  | the Adjusted |  |  | Longer Expected |
Transaction |  | in OCI |  |  | Profit or Loss |  |  | is Included |  |  | Line Item |  |  | to Occur |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | 2 |  |  | $ | — |  |  |  | — |  |  | $ | (4 | ) |  | $ | — |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Construction in progress and equipment to be accepted |  |  | Other gains and losses |
2019
|  | Comprehensive Income |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Reclassification from Equity to Profit or Loss and the Adjusted Line Item |
|  | Hedging Gain or Loss |  |  | Amount of Hedge Ineffectiveness |  |  | Line Item in Which Hedge |  |  | Amount Reclassified to P/L and |  |  | Due to Hedged Future Cash Flows No |
Hedge |  | Recognized |  |  | Recognized in |  |  | Ineffectiveness |  |  | the Adjusted |  |  | Longer Expected |
Transaction |  | in OCI |  |  | Profit or Loss |  |  | is Included |  |  | Line Item |  |  | to Occur |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | (1 | ) |  | $ | — |  |  |  | — |  |  | $ | (2 | ) |  | $ | — |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Construction in progress and equipment to be accepted |  |  | Other gains and losses |
2020
|  | Comprehensive Income |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Reclassification from Equity to Profit or Loss and the Adjusted Line Item |
|  | Hedging Gain or Loss |  |  | Amount of Hedge Ineffectiveness |  |  | Line Item in Which Hedge |  |  | Amount Reclassified to P/L and |  |  | Due to Hedged Future Cash Flows No |
Hedge |  | Recognized |  |  | Recognized in |  |  | Ineffectiveness |  |  | the Adjusted |  |  | Longer Expected |
Transaction |  | in OCI |  |  | Profit or Loss |  |  | is Included |  |  | Line Item |  |  | to Occur |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | 2 |  |  | $ | — |  |  |  | — |  |  | $ | 21 |  |  | $ | — |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Construction in progress and equipment to be accepted |  |  | Other gains and losses |
Foreign currency risk [Member] |
Disclosure Of Detailed Information About Hedging Instruments [Line Items] |
Summary of Hedging Derivative Financial Instruments | The following tables summarized the information relating to the hedges for foreign currency risk. December 31, 2018
|  |  |  | Notional |  |  |  | Forward |  |  | Line Item in |  | Carrying Amount |  |  | Change in Fair Values of Hedging Instruments Used for Calculating Hedge |
Hedging Instruments |  | Currency |  | Amount |  | Maturity |  | Rate |  |  | Balance Sheet |  | Asset |  |  | Liability |  |  | Ineffectiveness |
|  |  |  | (In Millions) |  |  |  |  |  |  |  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast purchases - forward exchange contracts |  | NT$/EUR |  | NT$ 172/ EUR 5 |  | 2019.03 |  | $ | 34.98 |  |  | Hedging financial assets (liabilities) |  | $ | 1 |  |  | $ | — |  |  | $ | 2 |
|  | Change in Value of Hedged Item Used for |  |  | Accumulated Gain or Loss on Hedging Instruments in Other Equity |
Hedged Items |  | Calculating Hedge Ineffectiveness |  |  | Continuing Hedges |  |  | Hedge Accounting No Longer Applied |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | (2 | ) |  | $ | 1 |  |  | $ | — |
December 31, 2019
|  |  |  | Notional |  |  |  | Forward |  |  | Line Item in |  | Carrying Amount |  |  | Change in Fair Values of Hedging Instruments Used for Calculating Hedge |
Hedging Instruments |  | Currency |  | Amount |  | Maturity |  | Rate |  |  | Balance Sheet |  | Asset |  |  | Liability |  |  | Ineffectiveness |
|  |  |  | (In Millions) |  |  |  |  |  |  |  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast purchases - forward exchange contracts |  | NT$/EUR |  | NT$ 84/EUR 2 |  | 2020.03 |  | $ | 33.66 |  |  | Hedging financial assets (liabilities) |  | $ | — |  |  | $ | — |  |  | $ | (1 | )
|  | Change in Value of Hedged Item Used for |  |  | Accumulated Gain or Loss on Hedging Instruments in Other Equity |
Hedged Items |  | Calculating Hedge Ineffectiveness |  |  | Continuing Hedges |  |  | Hedge Accounting No Longer Applied |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | 1 |  |  | $ | — |  |  | $ | — |
December 31, 2020
|  |  |  | Notional |  |  |  | Forward |  |  | Line Item in |  | Carrying Amount |  |  | Change in Fair Values of Hedging Instruments Used for Calculating Hedge |
Hedging Instruments |  | Currency |  | Amount |  | Maturity |  | Rate |  |  | Balance Sheet |  | Asset |  |  | Liability |  |  | Ineffectiveness |
|  |  |  | (In Millions) |  |  |  |  |  |  |  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (In Millions) |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast purchases - forward exchange contracts |  | NT$/EUR |  | NT$ 201/ EUR 6 |  | 2021.03 |  | $ | 34.45 |  |  | Hedging financial assets (liabilities) |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
|  | Change in Value of Hedged Item Used for |  |  | Accumulated Gain or Loss on Hedging Instruments in Other Equity |
Hedged Items |  | Calculating Hedge Ineffectiveness |  |  | Continuing Hedges |  |  | Hedge Accounting No Longer Applied |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |
Forecast equipment purchases |  | $ | (2 | ) |  | $ | 2 |  |  | $ | — |

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