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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Less: Current portion | $ (57,148.0) | $ (6,997.7) |
Long-term bank loans | 31,824.4 | 4,383.0 | $ 970.5
Long-term bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Less: Discounts on government grants | (1.3) | (27.8) |
Less: Current portion | (2,709.9) | (2,295.6) |
Long-term bank loans | $ 31,824.4 | $ 4,383.0 |
Maturity date | Due by December 2030 | Due by December 2027 |
Long-term bank loans [member] | Bottom of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Annual interest rate | 0.13% | 1.15% | 0.13%
Long-term bank loans [member] | Top of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Annual interest rate | 1.78% | 1.35% | 1.78%
Long term borrowings new taiwan dollar [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured loans | $ 4,410.8 | $ 6,706.4 |
Long term borrowings japanese yen [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured loans | $ 30,124.8 |  |

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