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Intangible Assets - Summary of Intangible Assets (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 detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | $ 79,187 |  |  |
Amortization expenses | (6,699) |  | $ (6,643) | $ (6,569)
Impairment losses | 0 | $ 0 | (9) | (29)
Ending balance | 72,727 | $ 2,375 | 79,187 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 113,474 |  | 112,245 | 112,341
Additions-acquired separately | 237 |  | 1,893 | 256
Disposal | (505) |  | (665) | (354)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 3 |  | 1 | 2
Ending balance | 113,209 |  | 113,474 | 112,245
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (34,287) |  | (28,300) | (22,056)
Amortization expenses | (6,699) |  | (6,643) | (6,569)
Disposal | 505 |  | 665 | 354
Impairment losses | (336) |  | (9) | (29)
Effect of foreign exchange differences | (1) |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (40,482) |  | (34,287) | (28,300)
Beginning balance, net | 79,187 |  | 83,945 |
Ending balance, net | 72,727 |  | 79,187 | 83,945
Mobile Broadband Concession [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 78,150 |  |  |
Ending balance | 71,761 |  | 78,150 |
Mobile Broadband Concession [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 109,963 |  | 108,338 | 108,338
Additions-acquired separately | 0 |  | 1,625 | 0
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 109,963 |  | 109,963 | 108,338
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (31,813) |  | (25,518) | (19,319)
Amortization expenses | (6,389) |  | (6,295) | (6,199)
Disposal | 0 |  | 0 | 0
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (38,202) |  | (31,813) | (25,518)
Beginning balance, net | 78,150 |  | 82,820 |
Ending balance, net | 71,761 |  | 78,150 | 82,820
Computer software [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 622 |  |  |
Ending balance | 579 |  | 622 |
Computer software [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 2,798 |  | 3,203 | 3,320
Additions-acquired separately | 231 |  | 257 | 225
Disposal | (499) |  | (663) | (344)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 3 |  | 1 | 2
Ending balance | 2,533 |  | 2,798 | 3,203
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (2,176) |  | (2,530) | (2,532)
Amortization expenses | (276) |  | (310) | (341)
Disposal | 499 |  | 664 | 343
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | (1) |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (1,954) |  | (2,176) | (2,530)
Beginning balance, net | 622 |  | 673 |
Ending balance, net | 579 |  | 622 | 673
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) | (45)
Amortization expenses | 0 |  | 0 | 0
Disposal | 0 |  | 0 | 0
Impairment losses |  |  | 0 | (29)
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 | 198 |  |  |
Ending balance | 170 |  | 198 |
Others [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | 422 |  | 413 | 392
Additions-acquired separately | 6 |  | 11 | 31
Disposal | (6) |  | (2) | (10)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 422 |  | 422 | 413
Others [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |
Beginning balance | (224) |  | (178) | (160)
Amortization expenses | (34) |  | (38) | (29)
Disposal | 6 |  | 1 | 11
Impairment losses |  |  | (9) | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (252) |  | (224) | (178)
Beginning balance, net | 198 |  | 235 |
Ending balance, net | $ 170 |  | $ 198 | $ 235

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