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Property, Plant and Equipment - Summary of Property, Plant and Equipment - Asset Used by The Company (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 288,914 |  |  |
Depreciation expenses | (26,930) |  | $ (27,461) | $ (28,143)
Additions | 23,164 |  | 27,979 | 26,069
Impairment losses | 93 | $ 4 | 0 | 0
Ending balance | 283,694 | $ 9,484 | 288,914 |
Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Ending balance | 276,370 |  |  |
Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 940,891 |  | 946,460 | 936,128
Additions |  |  | 27,979 | 26,069
Disposal |  |  | (33,350) | (15,448)
Effect of foreign exchange differences |  |  | 60 | (176)
Others |  |  | (258) | (113)
Ending balance |  |  | 940,891 | 946,460
Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 940,891 |  |  |
Effect of retrospective application of IFRS 16 | (11,086) |  |  |
Additions | 23,160 |  |  |
Disposal | (32,837) |  |  |
Effect of foreign exchange differences | (44) |  |  |
Others | (1,571) |  |  |
Ending balance | 918,513 |  | 940,891 |
Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 929,805 |  |  |
Ending balance |  |  | 929,805 |
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (651,977) |  | (657,752) | (644,958)
Depreciation expenses |  |  | (27,461) | (28,143)
Disposal |  |  | 33,228 | 15,182
Effect of foreign exchange differences |  |  | (20) | 47
Others |  |  | 28 | 120
Ending balance |  |  | (651,977) | (657,752)
Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (651,977) |  |  |
Depreciation expenses | (26,856) |  |  |
Effect of retrospective application of IFRS 16 | 3,842 |  |  |
Disposal | 32,751 |  |  |
Impairment losses | (93) |  |  |
Effect of foreign exchange differences | 17 |  |  |
Others | 173 |  |  |
Ending balance | (642,143) |  | (651,977) |
Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (648,135) |  |  |
Ending balance |  |  | (648,135) |
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 | 103,872
Additions |  |  | 0 | 0
Disposal |  |  | (71) | (158)
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | (36) | 365
Ending balance |  |  | 103,972 | 104,079
Land [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 103,972 |  |  |
Effect of retrospective application of IFRS 16 | (3,617) |  |  |
Additions | 0 |  |  |
Disposal | (38) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | (1,214) |  |  |
Ending balance | 99,103 |  | 103,972 |
Land [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 100,355 |  |  |
Ending balance |  |  | 100,355 |
Land [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses |  |  | 0 | 0
Disposal |  |  | 0 | 0
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 0 | 0
Ending balance |  |  | 0 | 0
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | 0 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Disposal | 0 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 0 |  |  |
Ending balance | 0 |  | 0 |
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 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 | 1,581
Additions |  |  | 0 | 0
Disposal |  |  | 0 | (5)
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 6 | 19
Ending balance |  |  | 1,601 | 1,595
Land improvements [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,601 |  |  |
Effect of retrospective application of IFRS 16 | (1) |  |  |
Additions | 0 |  |  |
Disposal | (7) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 25 |  |  |
Ending balance | 1,618 |  | 1,601 |
Land improvements [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,600 |  |  |
Ending balance |  |  | 1,600 |
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,338) |  | (1,293) | (1,248)
Depreciation expenses |  |  | (45) | (50)
Disposal |  |  | 0 | 4
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 0 | 1
Ending balance |  |  | (1,338) | (1,293)
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,338) |  |  |
Depreciation expenses | (43) |  |  |
Effect of retrospective application of IFRS 16 | 1 |  |  |
Disposal | 6 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | (1) |  |  |
Ending balance | (1,375) |  | (1,338) |
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,337) |  |  |
Ending balance |  |  | (1,337) |
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 | 67,738
Additions |  |  | 21 | 30
Disposal |  |  | 0 | (108)
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 196 | 5,034
Ending balance |  |  | 72,911 | 72,694
Buildings [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 72,911 |  |  |
Effect of retrospective application of IFRS 16 | (3,583) |  |  |
Additions | 1,221 |  |  |
Disposal | (3) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 455 |  |  |
Ending balance | 71,001 |  | 72,911 |
Buildings [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 69,328 |  |  |
Ending balance |  |  | 69,328 |
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (28,127) |  | (26,799) | (25,591)
Depreciation expenses |  |  | (1,356) | (1,402)
Disposal |  |  | 0 | 47
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 28 | 147
Ending balance |  |  | (28,127) | (26,799)
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (28,127) |  |  |
Depreciation expenses | (1,301) |  |  |
Effect of retrospective application of IFRS 16 | 1,265 |  |  |
Disposal | 3 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 183 |  |  |
Ending balance | (27,977) |  | (28,127) |
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (26,862) |  |  |
Ending balance |  |  | (26,862) |
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 | 14,295
Additions |  |  | 52 | 78
Disposal |  |  | (643) | (974)
Effect of foreign exchange differences |  |  | 0 | (1)
Others |  |  | 687 | 764
Ending balance |  |  | 14,258 | 14,162
Computer equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 14,258 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Additions | 57 |  |  |
Disposal | (1,916) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 606 |  |  |
Ending balance | 13,005 |  | 14,258 |
Computer equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 14,258 |  |  |
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) | (11,582)
Depreciation expenses |  |  | (983) | (1,192)
Disposal |  |  | 632 | 967
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | (4) | 19
Ending balance |  |  | (12,143) | (11,788)
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (12,143) |  |  |
Depreciation expenses | (827) |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Disposal | 1,909 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | (7) |  |  |
Ending balance | (11,068) |  | (12,143) |
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (12,143) |  |  |
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 | 715,692
Additions |  |  | 159 | 193
Disposal |  |  | (31,984) | (13,739)
Effect of foreign exchange differences |  |  | 60 | (172)
Others |  |  | 25,459 | 20,080
Ending balance |  |  | 715,748 | 722,054
Telecommunications equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 715,748 |  |  |
Effect of retrospective application of IFRS 16 | (3,885) |  |  |
Additions | 120 |  |  |
Disposal | (30,417) |  |  |
Effect of foreign exchange differences | (37) |  |  |
Others | 24,503 |  |  |
Ending balance | 706,032 |  | 715,748 |
Telecommunications equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 711,863 |  |  |
Ending balance |  |  | 711,863 |
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (599,426) |  | (607,154) | (596,497)
Depreciation expenses |  |  | (24,236) | (24,492)
Disposal |  |  | 31,952 | 13,712
Effect of foreign exchange differences |  |  | (20) | 45
Others |  |  | 32 | 78
Ending balance |  |  | (599,426) | (607,154)
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (599,426) |  |  |
Depreciation expenses | (23,906) |  |  |
Effect of retrospective application of IFRS 16 | 2,576 |  |  |
Disposal | 30,380 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 16 |  |  |
Others | 22 |  |  |
Ending balance | (590,338) |  | (599,426) |
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (596,850) |  |  |
Ending balance |  |  | (596,850) |
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 | 3,866
Additions |  |  | 0 | 1
Disposal |  |  | (29) | (62)
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 77 | 29
Ending balance |  |  | 3,882 | 3,834
Transportation equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,882 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Additions | 1 |  |  |
Disposal | (51) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 80 |  |  |
Ending balance | 3,912 |  | 3,882 |
Transportation equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,882 |  |  |
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) | (3,237)
Depreciation expenses |  |  | (162) | (330)
Disposal |  |  | 29 | 63
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | (5) | (9)
Ending balance |  |  | (3,651) | (3,513)
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (3,651) |  |  |
Depreciation expenses | (91) |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Disposal | 51 |  |  |
Impairment losses | 0 |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | (3) |  |  |
Ending balance | (3,694) |  | (3,651) |
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (3,651) |  |  |
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 | 8,943
Additions |  |  | 334 | 193
Disposal |  |  | (623) | (402)
Effect of foreign exchange differences |  |  | 0 | (3)
Others |  |  | 648 | 784
Ending balance |  |  | 9,874 | 9,515
Miscellaneous equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 9,874 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Additions | 149 |  |  |
Disposal | (405) |  |  |
Effect of foreign exchange differences | (1) |  |  |
Others | 473 |  |  |
Ending balance | 10,090 |  | 9,874 |
Miscellaneous equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 9,874 |  |  |
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) | (6,803)
Depreciation expenses |  |  | (679) | (677)
Disposal |  |  | 615 | 389
Effect of foreign exchange differences |  |  | 0 | 2
Others |  |  | (23) | (116)
Ending balance |  |  | (7,292) | (7,205)
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (7,292) |  |  |
Depreciation expenses | (688) |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Disposal | 402 |  |  |
Impairment losses | (64) |  |  |
Effect of foreign exchange differences | 1 |  |  |
Others | (21) |  |  |
Ending balance | (7,662) |  | (7,292) |
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (7,292) |  |  |
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 | 20,141
Additions |  |  | 27,413 | 25,574
Disposal |  |  | 0 | 0
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | (27,295) | (27,188)
Ending balance |  |  | 18,645 | 18,527
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 18,645 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Additions | 21,612 |  |  |
Disposal | 0 |  |  |
Effect of foreign exchange differences | (6) |  |  |
Others | (26,499) |  |  |
Ending balance | 13,752 |  | 18,645 |
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [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] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses |  |  | 0 | 0
Disposal |  |  | 0 | 0
Effect of foreign exchange differences |  |  | 0 | 0
Others |  |  | 0 | 0
Ending balance |  |  | 0 | $ 0
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | 0 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Disposal | 0 |  |  |
Impairment losses | (29) |  |  |
Effect of foreign exchange differences | 0 |  |  |
Others | 0 |  |  |
Ending balance | (29) |  | 0 |
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 0 |  |  |
Ending balance |  |  | $ 0 |

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- Definition Property plant and equipment effect of retrospective application of IFRS 16. + References No definition available. + Details
Name: | cht_PropertyPlantAndEquipmentEffectOfRetrospectiveApplicationOfIFRS16
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_75_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
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