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v3.25.1

Segment Information - Main Products and Service Revenues (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 Products And Services [Line Items] |  |  |  |
Revenues | $ 229,968 | $ 7,013 | $ 223,199 | $ 216,739
Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 139,982 |  | 137,093 | 132,063
Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 75,338 |  | 73,005 | 72,152
International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 9,919 |  | 9,188 | 7,189
Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 4,729 |  | 3,913 | 5,335
Fixed-line services [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 42,872 |  | 42,574 | 42,766
Fixed-line services [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 33,757 |  | 33,967 | 34,537
Fixed-line services [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 5,087 |  | 5,389 | 5,063
Sales [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 37,231 |  | 36,816 | 35,172
Sales [Member] | Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 3,803 |  | 3,034 | 4,553
Project Business [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 27,792 |  | 24,697 | 24,248
Project Business [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 4,016 |  | 2,841 | 1,506
Mobile Services [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 57,067 |  | 55,138 | 51,821
Mobile Services [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 9,152 |  | 9,119 | 8,942
Others [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 2,812 |  | 2,565 | 2,304
Others [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 4,637 |  | 5,222 | 4,425
Others [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 816 |  | 958 | 620
Others [Member] | Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | $ 926 |  | $ 879 | $ 782

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