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Revenue - Summary of Revenue (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Revenue [abstract]
Revenue from contracts with customers	$ 227,185		$ 220,190	$ 214,498
Other revenues
Government grants income	1,393		1,704	1,030
Rental income	1,196		1,120	1,022
Others	194		185	189
Revenue other than from contracts with customers	2,783		3,009	2,241
Total	$ 229,968	$ 7,013	$ 223,199	$ 216,739

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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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