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Provisions (Tables) | 12 Months Ended
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Dec. 31, 2020
Provisions [Abstract] |
Summary of Provisions |
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Warranties |  | $ | 173 |  |  | $ | 182 |
Onerous contracts |  |  | 67 |  |  |  | 171 |
Employee benefits |  |  | 59 |  |  |  | 57 |
Others |  |  | 5 |  |  |  | 5 |
|  | $ | 304 |  |  | $ | 415 |
Current |  | $ | 207 |  |  | $ | 314 |
Noncurrent |  |  | 97 |  |  |  | 101 |
|  | $ | 304 |  |  | $ | 415 |
Movements in Provisions |
|  | Warranties |  |  | Onerous Contracts |  |  | Employee Benefits |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Balance on January 1, 2018 |  | $ | 132 |  |  | $ | — |  |  | $ | 43 |  |  | $ | 5 |  |  | $ | 180 |
Additional provisions recognized |  |  | 164 |  |  |  | 19 |  |  |  | 9 |  |  |  | — |  |  |  | 192 |
Used / forfeited during the year |  |  | (164 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (165 | )
Balance on December 31, 2018 |  | $ | 132 |  |  | $ | 19 |  |  | $ | 51 |  |  | $ | 5 |  |  | $ | 207 |
Balance on January 1, 2019 |  | $ | 132 |  |  | $ | 19 |  |  | $ | 51 |  |  | $ | 5 |  |  | $ | 207 |
Additional provisions recognized |  |  | 127 |  |  |  | 48 |  |  |  | 9 |  |  |  | — |  |  |  | 184 |
Used / forfeited during the year |  |  | (86 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (87 | )
Balance on December 31, 2019 |  | $ | 173 |  |  | $ | 67 |  |  | $ | 59 |  |  | $ | 5 |  |  | $ | 304 |
Balance on January 1, 2020 |  | $ | 173 |  |  | $ | 67 |  |  | $ | 59 |  |  | $ | 5 |  |  | $ | 304 |
Additional/(reversal of) provisions recognized |  |  | 131 |  |  |  | 92 |  |  |  | (2 | ) |  |  | — |  |  |  | 221 |
Used / forfeited during the year |  |  | (122 | ) |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | (125 | )
Acquired by business combinations (Note 14) |  |  | — |  |  |  | 15 |  |  |  | — |  |  |  | — |  |  |  | 15 |
Balance on December 31, 2020 |  | $ | 182 |  |  | $ | 171 |  |  | $ | 57 |  |  | $ | 5 |  |  | $ | 415 |
| a. | The provision for warranty claims represents the present value of the management’s best estimate of the future outflow of economic benefits that will be required under the Company’s obligation for warranties in sales agreements. The estimate has been made based on the historical warranty experience.
| b. | The provision for employee benefits represents vested long-term service compensation accrued.
| c. | The provision for onerous contracts represents the present obligation resulting from the measurement for the unavoidable costs of meeting the Company’s contractual obligations exceed the economic benefits expected to be received from the contracts.

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