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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+ Details

Operating Segments Information - Production Information (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 products and services [line items]
Production Information	$ 1,069,985.4	$ 35,773.5	$ 1,031,473.6	$ 977,447.2
Wafer [member]
Disclosure of products and services [line items]
Production Information				875,461.4
Others [member]
Disclosure of products and services [line items]
Production Information				$ 101,985.8