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Segment Information - Geographic Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure Of Geographical Areas [Line Items] |  |  |  |
Revenues | $ 229,968 | $ 7,013 | $ 223,199 | $ 216,739
Taiwan,ROC[Member] |  |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |  |
Revenues | 220,398 |  | 215,265 | 209,727
Overseas [Member] |  |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |  |
Revenues | $ 9,570 |  | $ 7,934 | $ 7,012

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