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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 14,649.2 | $ 15,067.9
5-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 7,513.9 | 7,402.0
10-15 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 5,043.1 | 5,253.9
15-20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 1,972.7 | 2,255.2
More than 20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 119.5 | $ 156.8

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