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Net Revenue - Summary of Net Revenue (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015 TWD ($)
Disclosure Of Net Revenue [Abstract]
Net revenue from sale of goods	$ 976,923.2		$ 947,415.9	$ 842,997.6
Net revenue from royalties	524.0		522.4	499.8
Net revenue	$ 977,447.2	$ 32,977.3	$ 947,938.3	$ 843,497.4

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- Definition

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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The amount of income arising from royalties.

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