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Revenue - Summary of Revenue (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Revenue [abstract]
Revenue from contracts with customers	$ 220,190		$ 214,498	$ 208,412
Other revenues
Government grants income	1,704		1,030	1,037
Rental income	1,120		1,022	864
Others	185		189	165
Revenue other than from contracts with customers	3,009		2,241	2,066
Total	$ 223,199	$ 7,289	$ 216,739	$ 210,478

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Other revenues.

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Rental Income from operating activities.

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Revenue other than from contracts with customers.

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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 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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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.

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The amount of income recognised in relation to government grants. [Refer: Government grants]

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