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Bonds Payable - Summary of Bonds Payable (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($)
--- | --- | --- | ---
Bonds payable [line items] |  |  |
Less: Current portion | $ (18,100.0) |  | $ (4,400.0)
Noncurrent bonds payable | 834,336.4 | $ 27,150.4 | 610,070.6
Cost [member] | Taiwan [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 379,526.0 |  | 312,448.0
Cost [member] | Overseas [member] |  |  |
Bonds payable [line items] |  |  |
Unsecured bonds | 476,051.5 |  | 304,414.0
Discounts on bonds payable [member] |  |  |
Bonds payable [line items] |  |  |
Discounts on bonds payable | $ (3,141.1) |  | $ (2,391.4)

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