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Operating Segments Information - Major Customers Representing at Least 10 Percent of Net Revenue (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Disclosure of major customers [line items]
NET REVENUE	$ 1,069,985.4	$ 35,773.5	$ 1,031,473.6	$ 977,447.2
Customer A [member]
Disclosure of major customers [line items]
NET REVENUE	$ 247,213.3		$ 224,690.7	$ 220,463.1
Percentage of entity's revenue	23.00%	23.00%	22.00%	23.00%
Customer B [member]
Disclosure of major customers [line items]
NET REVENUE	$ 152,876.9		$ 83,885.6	$ 46,355.5
Percentage of entity's revenue	14.00%	14.00%	8.00%	5.00%

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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.

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The percentage of the entity's revenue. [Refer: Revenue]

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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