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Additional Information of Expenses by Nature - Additional Information (Detail) - TWD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 13, 2018 | Feb. 14, 2017 | Feb. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Expense by nature [line items] |  |  |  |  |  |
Profit sharing bonus to employees, amount |  |  |  | $ 23,019.1 | $ 22,418.3 | $ 20,556.9
Director 1 [member] |  |  |  |  |  |
Expense by nature [line items] |  |  |  |  |  |
Approved profit sharing bonus in cash | $ 368.9 | $ 376.4 | $ 356.2 |  |  |
Employees [member] |  |  |  |  |  |
Expense by nature [line items] |  |  |  |  |  |
Approved profit sharing bonus in cash |  |  | $ 20,556.9 |  |  |
Top of range [member] | Director 1 [member] |  |  |  |  |  |
Expense by nature [line items] |  |  |  |  |  |
Profit sharing bonus, percentage |  |  |  | 0.30% | 0.30% | 0.30%
Bottom of range [member] | Employees [member] |  |  |  |  |  |
Expense by nature [line items] |  |  |  |  |  |
Profit sharing bonus, percentage |  |  |  | 1.00% | 1.00% | 1.00%

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- Definition Accrued profit sharing bonus. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose the amount of expenses aggregated according to their nature (for example, depreciation, purchases of materials, transport costs, employee benefits and advertising costs), and not reallocated among functions within the entity. + References No definition available. + Details
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