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Segment Information - Analysis by Reportable Segment of Revenue and Operating Results of Continuing Operations (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 Operating Segments [Line Items] |  |  |  |
Revenues | $ 223,199 | $ 7,289 | $ 216,739 | $ 210,478
Income before income tax | 47,008 | $ 1,535 | 47,204 | 46,067
From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 223,199 |  | 216,739 | 210,478
Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 5,041 |  | 4,330 | 5,851
Consolidated [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 223,199 |  | 216,739 | 210,478
Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 228,240 |  | 221,069 | 216,329
Intersegment Elimination [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | (5,041) |  | (4,330) | (5,851)
Consumer Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 137,093 |  | 132,063 | 129,912
Income before income tax | 28,907 |  | 28,505 | 27,528
Consumer Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 137,093 |  | 132,063 | 129,912
Consumer Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 2,626 |  | 2,166 | 2,857
Consumer Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 139,719 |  | 134,229 | 132,769
Enterprise Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 73,005 |  | 72,152 | 69,258
Income before income tax | 14,363 |  | 15,607 | 15,094
Enterprise Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 73,005 |  | 72,152 | 69,258
Enterprise Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 1,014 |  | 952 | 1,693
Enterprise Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 74,019 |  | 73,104 | 70,951
International Business [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 9,188 |  | 7,189 | 6,122
Income before income tax | 2,141 |  | 1,694 | 1,246
International Business [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 9,188 |  | 7,189 | 6,122
International Business [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 995 |  | 864 | 961
International Business [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 10,183 |  | 8,053 | 7,083
Other [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 3,913 |  | 5,335 | 5,186
Income before income tax | 1,597 |  | 1,398 | 2,199
Other [Member] | From External Customers [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 3,913 |  | 5,335 | 5,186
Other [Member] | Intersegment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | 406 |  | 348 | 340
Other [Member] | Segment [Member] |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |
Revenues | $ 4,319 |  | $ 5,683 | $ 5,526

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