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v3.21.1

Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | $ 47,047 |  | $ 50,944 |
Additions-acquired separately | $ 48,373 |  |  |  |
Amortization expenses |  | (5,424) |  | (4,253) | $ (4,386)
Impairment losses |  | (9) | $ 0 | (9) | (51)
Ending balance |  | 90,285 | $ 3,214 | 47,047 | 50,944
Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 64,009 |  | 74,179 | 74,110
Additions-acquired separately |  | 48,605 |  | 363 | 498
Disposal |  | (341) |  | (10,535) | (429)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 67 |  |  |
Others |  | 1 |  | 2 |
Ending balance |  | 112,341 |  | 64,009 | 74,179
Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (16,962) |  | (23,235) | (19,227)
Amortization expenses |  | (5,424) |  | (4,253) | (4,386)
Disposal |  | 339 |  | 10,535 | 429
Impairment losses |  | (9) |  | (9) | (51)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Ending balance |  | (22,056) |  | (16,962) | (23,235)
Mobile Broadband Concession [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 45,672 |  | 49,512 |
Ending balance |  | 89,019 |  | 45,672 | 49,512
Mobile Broadband Concession [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 59,965 |  | 70,144 | 70,144
Additions-acquired separately |  | 48,373 |  | 0 | 0
Disposal |  | 0 |  | (10,179) | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Others |  | 0 |  | 0 |
Ending balance |  | 108,338 |  | 59,965 | 70,144
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (14,293) |  | (20,632) | (16,675)
Amortization expenses |  | (5,026) |  | (3,840) | (3,957)
Disposal |  | 0 |  | 10,179 | 0
Impairment losses |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Ending balance |  | (19,319) |  | (14,293) | (20,632)
Computer software [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 931 |  | 959 |
Ending balance |  | 788 |  | 931 | 959
Computer software [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 3,430 |  | 3,426 | 3,312
Additions-acquired separately |  | 226 |  | 358 | 485
Disposal |  | (338) |  | (356) | (371)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 1 |  |  |
Others |  | 1 |  | 2 |
Ending balance |  | 3,320 |  | 3,430 | 3,426
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (2,499) |  | (2,467) | (2,432)
Amortization expenses |  | (371) |  | (388) | (406)
Disposal |  | 338 |  | 356 | 371
Impairment losses |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Ending balance |  | (2,532) |  | (2,499) | (2,467)
Goodwill [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 200 |  | 209 |
Ending balance |  | 246 |  | 200 | 209
Goodwill [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 236 |  | 236 | 236
Additions-acquired separately |  | 0 |  | 0 | 0
Disposal |  | 0 |  | 0 | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 55 |  |  |
Others |  | 0 |  | 0 |
Ending balance |  | 291 |  | 236 | 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (36) |  | (27) | (27)
Amortization expenses |  | 0 |  | 0 | 0
Disposal |  | 0 |  | 0 | 0
Impairment losses |  | (9) |  | (9) | 0
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Ending balance |  | (45) |  | (36) | (27)
Others [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 244 |  | 264 |
Ending balance |  | 232 |  | 244 | 264
Others [Member] | Carrying Amount [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | 378 |  | 373 | 418
Additions-acquired separately |  | 6 |  | 5 | 13
Disposal |  | (3) |  | 0 | (58)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 11 |  |  |
Others |  | 0 |  | 0 |
Ending balance |  | 392 |  | 378 | 373
Others [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |  |  |
Beginning balance |  | (134) |  | (109) | (93)
Amortization expenses |  | (27) |  | (25) | (23)
Disposal |  | 1 |  | 0 | 58
Impairment losses |  | 0 |  | 0 | (51)
Effect of foreign exchange difference |  | 0 |  | 0 | 0
Acquired by business combinations |  | 0 |  |  |
Ending balance |  | $ (160) |  | $ (134) | $ (109)

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