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v3.19.1

Notes and Accounts Receivable, Net - Summary of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Less: Loss allowance | $ (7.3) |  | $ (471.8) | $ (480.1)
Notes and accounts receivable | 128,613.4 | $ 4,201.7 | 121,133.2 |
Amortized cost [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Less: Loss allowance | (7.3) |  | (471.8) |
Notes and accounts receivable | 125,018.3 |  | 121,133.2 |
FVTOCI [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Notes and accounts receivable | 3,595.1 |  | 0.0 |
Cost [member] | Amortized cost [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Notes and accounts receivable | $ 125,025.6 |  | $ 121,605.0 |

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