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.

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+ Details

Operating Segments Information - Production Information (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)
Disclosure of products and services [line items]
Production Information	$ 1,031,473.6	$ 33,697.3	$ 977,447.2	$ 947,938.3
Wafer [member]
Disclosure of products and services [line items]
Production Information			875,461.4	861,519.9
Others [member]
Disclosure of products and services [line items]
Production Information			$ 101,985.8	$ 86,418.4