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Bonds Payable - Summary of Bonds Payable (Detail) $ in Millions, $ in Millions | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
--- | --- | --- | ---
Bonds payable [line items] |  |  |
Less: Current portion | $ (4,400.0) |  | $ (2,600.0)
Noncurrent bonds payable | 610,070.6 | $ 21,992.4 | 254,105.1
Cost [member] | Taiwan [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 312,448.0 |  | 173,197.0
Cost [member] | Overseas [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 304,414.0 |  | 84,291.0
Discounts on bonds payable [member] |  |  |
Bonds payable [line items] |  |  |
Discounts on bonds payable | $ (2,391.4) |  | $ (782.9)

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