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Segment Information - Main Products and Service Revenues (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | $ 223,199 | $ 7,289 | $ 216,739 | $ 210,478
Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 137,093 |  | 132,063 | 129,912
Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 73,005 |  | 72,152 | 69,258
International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 9,188 |  | 7,189 | 6,122
Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 3,913 |  | 5,335 | 5,186
Fixed-line services [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 42,574 |  | 42,766 | 42,277
Fixed-line services [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 33,967 |  | 34,537 | 34,712
Fixed-line services [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 5,389 |  | 5,063 | 5,008
Sales [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 36,816 |  | 35,172 | 36,145
Sales [Member] | Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 3,034 |  | 4,553 | 4,335
Project Business [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 24,697 |  | 24,248 | 22,299
Project Business [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 2,841 |  | 1,506 | 679
Mobile Services [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 55,138 |  | 51,821 | 49,043
Mobile Services [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 9,119 |  | 8,942 | 8,446
Others [Member] | Consumer Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 2,565 |  | 2,304 | 2,447
Others [Member] | Enterprise Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 5,222 |  | 4,425 | 3,801
Others [Member] | International Business [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | 958 |  | 620 | 435
Others [Member] | Others [Member] |  |  |  |
Disclosure Of Products And Services [Line Items] |  |  |  |
Revenues | $ 879 |  | $ 782 | $ 851

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