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v3.19.1

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | $ 288,708 |  |  |
Depreciation expenses | (27,461) |  | $ (28,143) | $ (29,087)
Additions | 27,979 |  | 26,069 | 24,591
Impairment losses | 0 | $ 0 | 0 | 596
Ending balance | 288,914 | $ 9,439 | 288,708 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 946,460 |  | 936,128 | 925,434
Additions | 27,979 |  | 26,069 | 24,591
Disposal | (33,350) |  | (15,448) | (13,810)
Effect of foreign exchange differences | 60 |  | (176) | (42)
Others | (258) |  | (113) | (45)
Ending balance | 940,891 |  | 946,460 | 936,128
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (657,752) |  | (644,958) | (629,035)
Depreciation expenses | (27,461) |  | (28,143) | (29,087)
Disposal | 33,228 |  | 15,182 | 13,718
Impairment losses |  |  |  | (596)
Effect of foreign exchange differences | (20) |  | 47 | 12
Others | 28 |  | 120 | 30
Ending balance | (651,977) |  | (657,752) | (644,958)
Land [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 104,079 |  |  |
Ending balance | 103,972 |  | 104,079 |
Land [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 104,079 |  | 103,872 | 102,747
Additions | 0 |  | 0 | 791
Disposal | (71) |  | (158) | (2)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | (36) |  | 365 | 336
Ending balance | 103,972 |  | 104,079 | 103,872
Land [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation 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 | 0 |  | 0 | 0
Land improvements [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 302 |  |  |
Ending balance | 263 |  | 302 |
Land improvements [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 1,595 |  | 1,581 | 1,575
Additions | 0 |  | 0 | 0
Disposal | 0 |  | (5) | (6)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 6 |  | 19 | 12
Ending balance | 1,601 |  | 1,595 | 1,581
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (1,293) |  | (1,248) | (1,203)
Depreciation expenses | (45) |  | (50) | (51)
Disposal | 0 |  | 4 | 6
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 1 | 0
Ending balance | (1,338) |  | (1,293) | (1,248)
Buildings [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 45,895 |  |  |
Ending balance | 44,784 |  | 45,895 |
Buildings [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 72,694 |  | 67,738 | 67,790
Additions | 21 |  | 30 | 36
Disposal | 0 |  | (108) | (35)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 196 |  | 5,034 | (53)
Ending balance | 72,911 |  | 72,694 | 67,738
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (26,799) |  | (25,591) | (24,421)
Depreciation expenses | (1,356) |  | (1,402) | (1,269)
Disposal | 0 |  | 47 | 34
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 28 |  | 147 | 65
Ending balance | (28,127) |  | (26,799) | (25,591)
Computer equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 2,374 |  |  |
Ending balance | 2,115 |  | 2,374 |
Computer equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 14,162 |  | 14,295 | 14,996
Additions | 52 |  | 78 | 42
Disposal | (643) |  | (974) | (1,546)
Effect of foreign exchange differences | 0 |  | (1) | (3)
Others | 687 |  | 764 | 806
Ending balance | 14,258 |  | 14,162 | 14,295
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (11,788) |  | (11,582) | (11,715)
Depreciation expenses | (983) |  | (1,192) | (1,332)
Disposal | 632 |  | 967 | 1,529
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 1
Others | (4) |  | 19 | (65)
Ending balance | (12,143) |  | (11,788) | (11,582)
Telecommunications equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 114,900 |  |  |
Impairment losses |  |  |  | 596
Ending balance | 116,322 |  | 114,900 |
Telecommunications equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 722,054 |  | 715,692 | 705,372
Additions | 159 |  | 193 | 171
Disposal | (31,984) |  | (13,739) | (11,542)
Effect of foreign exchange differences | 60 |  | (172) | (35)
Others | 25,459 |  | 20,080 | 21,726
Ending balance | 715,748 |  | 722,054 | 715,692
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (607,154) |  | (596,497) | (582,205)
Depreciation expenses | (24,236) |  | (24,492) | (25,280)
Disposal | 31,952 |  | 13,712 | 11,512
Impairment losses |  |  |  | (596)
Effect of foreign exchange differences | (20) |  | 45 | 7
Others | 32 |  | 78 | 65
Ending balance | (599,426) |  | (607,154) | (596,497)
Transportation equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 321 |  |  |
Ending balance | 231 |  | 321 |
Transportation equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 3,834 |  | 3,866 | 3,815
Additions | 0 |  | 1 | 1
Disposal | (29) |  | (62) | (54)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 77 |  | 29 | 104
Ending balance | 3,882 |  | 3,834 | 3,866
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (3,513) |  | (3,237) | (2,750)
Depreciation expenses | (162) |  | (330) | (529)
Disposal | 29 |  | 63 | 54
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | (5) |  | (9) | (12)
Ending balance | (3,651) |  | (3,513) | (3,237)
Miscellaneous equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 2,310 |  |  |
Ending balance | 2,582 |  | 2,310 |
Miscellaneous equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 9,515 |  | 8,943 | 8,737
Additions | 334 |  | 193 | 255
Disposal | (623) |  | (402) | (625)
Effect of foreign exchange differences | 0 |  | (3) | (4)
Others | 648 |  | 784 | 580
Ending balance | 9,874 |  | 9,515 | 8,943
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (7,205) |  | (6,803) | (6,741)
Depreciation expenses | (679) |  | (677) | (626)
Disposal | 615 |  | 389 | 583
Impairment losses |  |  |  | 0
Effect of foreign exchange differences | 0 |  | 2 | 4
Others | (23) |  | (116) | (23)
Ending balance | (7,292) |  | (7,205) | (6,803)
Construction in progress and equipment to be accepted [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 18,527 |  |  |
Ending balance | 18,645 |  | 18,527 |
Construction in progress and equipment to be accepted [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 18,527 |  | 20,141 | 20,402
Additions | 27,413 |  | 25,574 | 23,295
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | (27,295) |  | (27,188) | (23,556)
Ending balance | 18,645 |  | 18,527 | 20,141
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation 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 | $ 0 |  | $ 0 | $ 0

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2018-03-16 + Details
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