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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
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

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+ References

No definition available.

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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

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