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Application of New and Amended International Financial Reporting Standards - Summary of Lease Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Presentation Of Leases For Lessee [Abstract] |  |  |
The future aggregate minimum lease payments of non-cancellable operating lease on December 31, 2018 |  |  | $ 10,558
Less: Recognition exemption for leases of low-value assets |  | $ (3) |
Undiscounted amount on January 1, 2019 |  | 10,555 |
Discounted lease liabilities using the incremental borrowing rate on January 1, 2019 |  | 10,340 |
Lease liabilities recognized on January 1, 2019 | $ 9,758 | $ 10,340 |

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- Definition Discounted Lease Liabilities Using The Incremental Borrowing Rate + References No definition available. + Details
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- Definition Future aggregate minimum lease payments of non cancellable operating lease. + References No definition available. + Details
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- Definition Lease Undiscounted Amount + References No definition available. + Details
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- Definition Recognition Exemption For Leases Of Low Value Assets + 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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- References No definition available. + Details
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