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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 21,754.4 | $ 22,589.1
5-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 10,197.5 | 10,241.7
10-15 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 7,121.6 | 7,329.0
15-20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 4,117.1 | 4,233.9
More than 20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 318.2 | $ 784.5

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