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Inventories - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Classes Of Inventories [Abstract] |  |  |  |
Operating costs related to inventories | $ 49,258 |  | $ 48,649 | $ 56,342
Valuation loss on inventories recognized as operating costs | 475 | $ 16 | 365 | $ 52
Inventory to be recovered longer than twelve months | $ 2,076 |  | $ 2,076 |

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