Segment Information - Geographic Information (Detail) $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure Of Geographical Areas [Line Items]
Revenues	$ 223,199	$ 7,289	$ 216,739	$ 210,478
Taiwan,ROC[Member]
Disclosure Of Geographical Areas [Line Items]
Revenues	215,265		209,727	204,473
Overseas [Member]
Disclosure Of Geographical Areas [Line Items]
Revenues	$ 7,934		$ 7,012	$ 6,005

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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+ Details