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Application Of New And Revised International Financial Reporting Standards (Ifrs), International Accounting Standards (Ias), Ifric Interpretations (Ifric), And Sic Interpretations (Sic) Issued By The International Accounting Standards Board (Iasb) (Collectively, "Ifrss") - Summary of Future Minimum Lease Payments of Non-cancellable Operating Lease (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of initial application of standards or interpretations [abstract]
The future minimum lease payments of non-cancellable operating lease on December 31, 2018	$ 20,849.6	$ 17,196.8
Less: Recognition exemption for short-term leases	(3,189.8)
Undiscounted gross amounts on January 1, 2019	17,659.8
Discounted using the incremental borrowing rate on January 1, 2019	16,465.6
Add: Adjustments as a result of a different treatment of extension and purchase options	3,438.0
Lease liabilities recognized on January 1, 2019	$ 19,903.6

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The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 53
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_c&doctype=Standard
-URIDate 2018-03-16

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2018-03-16

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The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_35_a&doctype=Standard&book=b
-URIDate 2018-03-16

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The amount of the discounted extension and purchase options of assets subject to leases agreements under IFRS16.

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The amount of lessee's discounted obligation for lease payments from lease agreements under IFRS16.

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The amount of lessee's undiscounted obligation for lease payments from lease agreements under IFRS16.

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