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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 283,694 |  | $ 288,914 |
Depreciation expenses | (26,989) |  | (26,930) | $ (27,461)
Additions | 25,195 |  | 23,164 | 27,979
Disposal | (307) |  | (86) | (122)
Impairment losses | 0 | $ 0 | 93 | 0
Ending balance | $ 281,416 | $ 10,022 | 283,694 | 288,914
Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 940,891 | 946,460
Additions |  |  |  | 27,979
Disposal |  |  |  | (33,350)
Effect of foreign exchange differences |  |  |  | 60
Others |  |  |  | (258)
Ending balance |  |  |  | 940,891
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (651,977) | (657,752)
Depreciation expenses |  |  |  | (27,461)
Disposal |  |  |  | 33,228
Effect of foreign exchange differences |  |  |  | (20)
Others |  |  |  | 28
Ending balance |  |  |  | (651,977)
Land [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 103,972 |
Ending balance |  |  |  | 103,972
Land [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 103,972 | 104,079
Additions |  |  |  | 0
Disposal |  |  |  | (71)
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | (36)
Ending balance |  |  |  | 103,972
Land [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 0 | 0
Depreciation expenses |  |  |  | 0
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 0
Ending balance |  |  |  | 0
Land improvements [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 263 |
Ending balance |  |  |  | 263
Land improvements [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 1,601 | 1,595
Additions |  |  |  | 0
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 6
Ending balance |  |  |  | 1,601
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (1,338) | (1,293)
Depreciation expenses |  |  |  | (45)
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 0
Ending balance |  |  |  | (1,338)
Buildings [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 44,784 |
Ending balance |  |  |  | 44,784
Buildings [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 72,911 | 72,694
Additions |  |  |  | 21
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 196
Ending balance |  |  |  | 72,911
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (28,127) | (26,799)
Depreciation expenses |  |  |  | (1,356)
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 28
Ending balance |  |  |  | (28,127)
Computer equipment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 2,115 |
Ending balance |  |  |  | 2,115
Computer equipment [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 14,258 | 14,162
Additions |  |  |  | 52
Disposal |  |  |  | (643)
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 687
Ending balance |  |  |  | 14,258
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (12,143) | (11,788)
Depreciation expenses |  |  |  | (983)
Disposal |  |  |  | 632
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | (4)
Ending balance |  |  |  | (12,143)
Telecommunications equipment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 116,322 |
Ending balance |  |  |  | 116,322
Telecommunications equipment [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 715,748 | 722,054
Additions |  |  |  | 159
Disposal |  |  |  | (31,984)
Effect of foreign exchange differences |  |  |  | 60
Others |  |  |  | 25,459
Ending balance |  |  |  | 715,748
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (599,426) | (607,154)
Depreciation expenses |  |  |  | (24,236)
Disposal |  |  |  | 31,952
Effect of foreign exchange differences |  |  |  | (20)
Others |  |  |  | 32
Ending balance |  |  |  | (599,426)
Transportation equipment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 231 |
Ending balance |  |  |  | 231
Transportation equipment [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 3,882 | 3,834
Additions |  |  |  | 0
Disposal |  |  |  | (29)
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 77
Ending balance |  |  |  | 3,882
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (3,651) | (3,513)
Depreciation expenses |  |  |  | (162)
Disposal |  |  |  | 29
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | (5)
Ending balance |  |  |  | (3,651)
Miscellaneous equipment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 2,582 |
Ending balance |  |  |  | 2,582
Miscellaneous equipment [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 9,874 | 9,515
Additions |  |  |  | 334
Disposal |  |  |  | (623)
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 648
Ending balance |  |  |  | 9,874
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | (7,292) | (7,205)
Depreciation expenses |  |  |  | (679)
Disposal |  |  |  | 615
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | (23)
Ending balance |  |  |  | (7,292)
Construction in progress and equipment to be accepted [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 18,645 |
Ending balance |  |  |  | 18,645
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | 18,645 | 18,527
Additions |  |  |  | 27,413
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | (27,295)
Ending balance |  |  |  | 18,645
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance |  |  | $ 0 | 0
Depreciation expenses |  |  |  | 0
Disposal |  |  |  | 0
Effect of foreign exchange differences |  |  |  | 0
Others |  |  |  | 0
Ending balance |  |  |  | $ 0

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