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v3.25.1

Segment Information - Analysis by Reportable Segment of Revenue and Operating Results of Continuing Operations (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | $ 229,968 | $ 7,013 | $ 223,199 | $ 216,739
Income before income tax | 47,841 | $ 1,459 | 47,008 | 47,204
From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 229,968 |  | 223,199 | 216,739
Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 5,132 |  | 5,041 | 4,330
Consolidated [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 229,968 |  | 223,199 | 216,739
Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 235,100 |  | 228,240 | 221,069
Intersegment Elimination [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | (5,132) |  | (5,041) | (4,330)
Consumer Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 139,982 |  | 137,093 | 132,063
Income before income tax | 29,771 |  | 28,907 | 28,505
Consumer Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 139,982 |  | 137,093 | 132,063
Consumer Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 2,765 |  | 2,626 | 2,166
Consumer Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 142,747 |  | 139,719 | 134,229
Enterprise Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 75,338 |  | 73,005 | 72,152
Income before income tax | 12,881 |  | 14,363 | 15,607
Enterprise Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 75,338 |  | 73,005 | 72,152
Enterprise Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 884 |  | 1,014 | 952
Enterprise Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 76,222 |  | 74,019 | 73,104
International Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 9,919 |  | 9,188 | 7,189
Income before income tax | 2,383 |  | 2,141 | 1,694
International Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 9,919 |  | 9,188 | 7,189
International Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 1,107 |  | 995 | 864
International Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 11,026 |  | 10,183 | 8,053
Other [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 4,729 |  | 3,913 | 5,335
Income before income tax | 2,806 |  | 1,597 | 1,398
Other [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 4,729 |  | 3,913 | 5,335
Other [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 376 |  | 406 | 348
Other [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | $ 5,105 |  | $ 4,319 | $ 5,683

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