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Bonds Payable - Summary of Bonds Payable (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Bonds payable [line items] |  |  |
Less: Current portion | $ (34,900.0) |  | $ (58,401.1)
Noncurrent bonds payable | 56,900.0 | $ 1,858.9 | 91,800.0
Overseas [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds |  | $ 1,150.0 |
Cost [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 91,800.0 |  | 150,207.8
Cost [member] | Taiwan [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | $ 91,800.0 |  | 116,100.0
Cost [member] | Overseas [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds |  |  | 34,107.8
Discounts on bonds payable [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds |  |  | $ 6.7

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