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Operating Segments Information - Geographic Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers | $ 1,031,473.6 | $ 33,697.3 | $ 977,447.2 | $ 947,938.3
Non-current Assets | 1,090,637.0 |  | 1,079,700.6 |
Taiwan [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | 88,046.1 | 125,106.7
Non-current Assets | 1,039,471.3 |  | 1,027,963.2 |
United States [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | 635,851.7 | 626,434.8
Non-current Assets | 7,569.8 |  | 7,515.9 |
China [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | 110,201.4 | 82,634.1
Non-current Assets | 43,574.5 |  | 44,204.9 |
Europe, the Middle East and Africa [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | 69,046.8 | 58,112.4
Non-current Assets | 8.3 |  | 8.1 |
Japan [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | 60,628.0 | 44,373.0
Non-current Assets | $ 13.1 |  | 8.5 |
Others [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net revenue from external customers |  |  | $ 13,673.2 | $ 11,277.3

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