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Provisions (Tables) | 12 Months Ended
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Dec. 31, 2017
Provisions [Abstract] |
Summary of Provisions |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Warranties |  | $ | 111 |  |  | $ | 132 |
Trade-in right |  |  | 31 |  |  |  | 87 |
Employee benefits |  |  | 38 |  |  |  | 43 |
Others |  |  | 5 |  |  |  | 5 |
|  | $ | 185 |  |  | $ | 267 |
Current |  | $ | 119 |  |  | $ | 189 |
Noncurrent |  |  | 66 |  |  |  | 78 |
|  | $ | 185 |  |  | $ | 267 |
Movements in Provisions |
|  | Warranties |  |  | Trade-in rights |  |  | Employee Benefits |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Balance on January 1, 2015 |  | $ | 212 |  |  | $ | — |  |  | $ | 55 |  |  | $ | 5 |  |  | $ | 272 |
Additional provisions recognized |  |  | 100 |  |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 112 |
Used / forfeited during the year |  |  | (99 | ) |  |  | — |  |  |  | (37 | ) |  |  | — |  |  |  | (136 | )
Balance on December 31, 2015 |  | $ | 213 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 5 |  |  | $ | 248 |
Balance on January 1, 2016 |  | $ | 213 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 5 |  |  | $ | 248 |
Additional provisions recognized |  |  | 81 |  |  |  | 31 |  |  |  | 9 |  |  |  | — |  |  |  | 121 |
Used / forfeited during the year |  |  | (183 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (184 | )
Balance on December 31, 2016 |  | $ | 111 |  |  | $ | 31 |  |  | $ | 38 |  |  | $ | 5 |  |  | $ | 185 |
Balance on January 1, 2017 |  | $ | 111 |  |  | $ | 31 |  |  | $ | 38 |  |  | $ | 5 |  |  | $ | 185 |
Additional provisions recognized |  |  | 79 |  |  |  | 69 |  |  |  | 7 |  |  |  | — |  |  |  | 155 |
Used / forfeited during the year |  |  | (58 | ) |  |  | (13 | ) |  |  | (2 | ) |  |  | — |  |  |  | (73 | )
Balance on December 31, 2017 |  | $ | 132 |  |  | $ | 87 |  |  | $ | 43 |  |  | $ | 5 |  |  | $ | 267 |

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