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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 17,316.9 | $ 19,903.6
Less than 5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 7,742.5 |
5-10 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 5,581.1 |
10-15 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 3,691.3 |
15-20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | 1,600.9 |
More than 20 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Lease liabilities | $ 74.4 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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