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Financial Instruments at Fair Value Through Profit or Loss (Tables) | 12 Months Ended
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Dec. 31, 2024
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 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Financial assets-current |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |
Derivatives (not designated for hedge) |  |  |  |  |  |
Forward exchange contracts |  | $ | 1 |  |  | $ | — |
Non-derivatives |  |  |  |  |  |
Listed stocks - domestic |  |  | — |  |  |  | — |
|  | $ | 1 |  |  | $ | — |
Financial assets-noncurrent |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |
Non-derivatives |  |  |  |  |  |
Non-listed stocks - domestic |  | $ | 704 |  |  | $ | 629 |
Non-listed stocks - foreign |  |  | 89 |  |  |  | 32 |
Limited partnership - domestic |  |  | 219 |  |  |  | 307 |
Other investing agreements |  |  | 24 |  |  |  | 37 |
|  | $ | 1,036 |  |  | $ | 1,005 |
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, 2023 |  |  |  |  |  |
Forward exchange contracts - buy |  | NT$/EUR |  | March 2024 |  | NT$145/EUR 4
December 31, 2024 |  |  |  |  |  |
Forward exchange contracts - buy |  | NT$/USD |  | January 2025 |  | NT$46/USD 1
Forward exchange contracts - buy |  | NT$/EUR |  | March 2025 |  | NT$10/EUR 0.3

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