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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 20,782.7 | $ 21,754.4
5-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 10,296.9 | 10,197.5
10-15 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 6,821.6 | 7,121.6
15-20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 3,547.4 | 4,117.1
More than 20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 116.8 | $ 318.2

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