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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 15,067.9 | $ 10,947.7
5-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 7,402.0 | 5,581.1
10-15 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 5,253.9 | 3,691.3
15-20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 2,255.2 | 1,600.9
More than 20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 156.8 | $ 74.4

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