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Revenue - Summary of Revenue (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Revenue [Abstract] |  |  |  |
Revenue from contracts with customers | $ 214,461 |  |  |
Other revenues |  |  |  |
Rental income | 640 |  |  |
Other | 382 |  |  |
Revenue other than from contracts with customers | 1,022 |  |  |
Total | $ 215,483 | $ 7,040 | $ 227,514 | $ 229,991

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