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Intangible Assets - Summary of Intangible Assets (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 detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | $ 72,727 |  |  |
Amortization expenses | (6,699) |  | $ (6,699) | $ (6,643)
Impairment losses | 0 | $ 0 | 0 | (9)
Ending balance | 66,283 | $ 2,021 | 72,727 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 113,209 |  | 113,474 | 112,245
Additions-acquired separately | 234 |  | 237 | 1,893
Disposal | (366) |  | (505) | (665)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 24 |  | 3 | 1
Ending balance | 113,101 |  | 113,209 | 113,474
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (40,482) |  | (34,287) | (28,300)
Amortization expenses | (6,699) |  | (6,699) | (6,643)
Disposal | 366 |  | 505 | 665
Impairment losses |  |  | (336) | (9)
Effect of foreign exchange differences | 0 |  | (1) | 0
Others | (3) |  | 0 | 0
Ending balance | (46,818) |  | (40,482) | (34,287)
Beginning balance, net | 72,727 |  | 79,187 |
Ending balance, net | 66,283 |  | 72,727 | 79,187
Mobile Broadband Concession [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 71,761 |  |  |
Ending balance | 65,371 |  | 71,761 |
Mobile Broadband Concession [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 109,963 |  | 109,963 | 108,338
Additions-acquired separately | 0 |  | 0 | 1,625
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 109,963 |  | 109,963 | 109,963
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (38,202) |  | (31,813) | (25,518)
Amortization expenses | (6,390) |  | (6,389) | (6,295)
Disposal | 0 |  | 0 | 0
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (44,592) |  | (38,202) | (31,813)
Beginning balance, net | 71,761 |  | 78,150 |
Ending balance, net | 65,371 |  | 71,761 | 78,150
Computer software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 579 |  |  |
Ending balance | 551 |  | 579 |
Computer software [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 2,533 |  | 2,798 | 3,203
Additions-acquired separately | 229 |  | 231 | 257
Disposal | (358) |  | (499) | (663)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 24 |  | 3 | 1
Ending balance | 2,428 |  | 2,533 | 2,798
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (1,954) |  | (2,176) | (2,530)
Amortization expenses | (278) |  | (276) | (310)
Disposal | 358 |  | 499 | 664
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | (1) | 0
Others | (3) |  | 0 | 0
Ending balance | (1,877) |  | (1,954) | (2,176)
Beginning balance, net | 579 |  | 622 |
Ending balance, net | 551 |  | 579 | 622
Goodwill [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 217 |  |  |
Ending balance | 217 |  | 217 |
Goodwill [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 291 |  | 291 | 291
Additions-acquired separately | 0 |  | 0 | 0
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 291 |  | 291 | 291
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (74) |  | (74) | (74)
Amortization expenses | 0 |  | 0 | 0
Disposal | 0 |  | 0 | 0
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (74) |  | (74) | (74)
Beginning balance, net | 217 |  | 217 |
Ending balance, net | 217 |  | 217 | 217
Others [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 170 |  |  |
Ending balance | 144 |  | 170 |
Others [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 422 |  | 422 | 413
Additions-acquired separately | 5 |  | 6 | 11
Disposal | (8) |  | (6) | (2)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 419 |  | 422 | 422
Others [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (252) |  | (224) | (178)
Amortization expenses | (31) |  | (34) | (38)
Disposal | 8 |  | 6 | 1
Impairment losses |  |  |  | (9)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others |  |  | 0 | 0
Ending balance | (275) |  | (252) | (224)
Beginning balance, net | 170 |  | 198 |
Ending balance, net | $ 144 |  | $ 170 | $ 198

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