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Bonds Payable - Summary of Bonds Payable (Detail) $ in Millions, $ in Millions | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($)
--- | --- | --- | ---
Bonds payable [line items] |  |  |
Less: Current portion | $ (6,997.7) |  | $ (18,100.0)
Noncurrent bonds payable | 913,899.8 | $ 29,846.4 | 834,336.4
Cost [member] | Taiwan [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 447,194.0 |  | 379,526.0
Cost [member] | Overseas [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 476,578.5 |  | 476,051.5
Discounts on bonds payable [member] |  |  |
Bonds payable [line items] |  |  |
Discounts on bonds payable | $ (2,875.0) |  | $ (3,141.1)

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