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Revenue - Summary of Revenue (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 214,461
Other revenues
Rental income	640
Other	382
Revenue other than from contracts with customers	1,022
Total	$ 215,483	$ 7,040	$ 227,514	$ 229,991

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The amount of operating income that the entity does not separately disclose in the same statement or note.

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The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue]

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