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Bonds Payable - Summary of Bonds Payable (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Bonds Payable [Line Items] |  |  |
Less: Current portion | $ (58,401.1) |  | $ (38,100.0)
Noncurrent bonds payable | 91,800.0 | $ 3,097.2 | 153,093.6
Cost [member] |  |  |
Bonds Payable [Line Items] |  |  |
Unsecured bonds | 150,207.8 |  | 191,228.9
Cost [member] | Taiwan [member] |  |  |
Bonds Payable [Line Items] |  |  |
Unsecured bonds | 116,100.0 |  | 154,200.0
Cost [member] | Overseas [member] |  |  |
Bonds Payable [Line Items] |  |  |
Unsecured bonds | 34,107.8 |  | 37,028.9
Discounts on bonds payable [member] |  |  |
Bonds Payable [Line Items] |  |  |
Unsecured bonds | $ 6.7 |  | $ 35.3

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