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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, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | $ 291,170 |  |  |
Depreciation expenses | (28,143) |  | $ (29,087) | $ (30,350)
Additions | 26,069 |  | 24,591 | 24,451
Impairment losses | 0 | $ 0 | 596 | 138
Ending balance | 288,708 | $ 9,740 | 291,170 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 936,128 |  | 925,434 | 915,723
Additions | 26,069 |  | 24,591 | 24,451
Disposal | (15,448) |  | (13,810) | (14,711)
Effect of foreign exchange differences | (176) |  | (42) | 69
Acquisitions through business combinations |  |  |  | 65
Others | (113) |  | (45) | (163)
Ending balance | 946,460 |  | 936,128 | 925,434
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (644,958) |  | (629,035) | (613,073)
Depreciation expenses | (28,143) |  | (29,087) | (30,350)
Disposal | 15,182 |  | 13,718 | 14,598
Impairment losses |  |  | (596) | (138)
Effect of foreign exchange differences | 47 |  | 12 | (14)
Acquisitions through business combinations |  |  |  | (29)
Others | 120 |  | 30 | (29)
Ending balance | (657,752) |  | (644,958) | (629,035)
Land [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 103,872 |  | 102,747 | 102,774
Additions | 0 |  | 791 | 0
Disposal | (158) |  | (2) | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 19
Others | 365 |  | 336 | (46)
Ending balance | 104,079 |  | 103,872 | 102,747
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 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 0 |  | 0 | 0
Ending balance | 0 |  | 0 | 0
Land improvements [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 1,581 |  | 1,575 | 1,558
Additions | 0 |  | 0 | 0
Disposal | (5) |  | (6) | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 19 |  | 12 | 17
Ending balance | 1,595 |  | 1,581 | 1,575
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (1,248) |  | (1,203) | (1,145)
Depreciation expenses | (50) |  | (51) | (53)
Disposal | 4 |  | 6 | 0
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 1 |  | 0 | (5)
Ending balance | (1,293) |  | (1,248) | (1,203)
Buildings [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 67,738 |  | 67,790 | 67,600
Additions | 30 |  | 36 | 59
Disposal | (108) |  | (35) | (11)
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 7
Others | 5,034 |  | (53) | 135
Ending balance | 72,694 |  | 67,738 | 67,790
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (25,591) |  | (24,421) | (23,202)
Depreciation expenses | (1,402) |  | (1,269) | (1,269)
Disposal | 47 |  | 34 | 10
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | (1)
Others | 147 |  | 65 | 41
Ending balance | (26,799) |  | (25,591) | (24,421)
Computer equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 14,295 |  | 14,996 | 15,318
Additions | 78 |  | 42 | 37
Disposal | (974) |  | (1,546) | (1,073)
Effect of foreign exchange differences | (1) |  | (3) | 0
Acquisitions through business combinations |  |  |  | 0
Others | 764 |  | 806 | 714
Ending balance | 14,162 |  | 14,295 | 14,996
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (11,582) |  | (11,715) | (11,308)
Depreciation expenses | (1,192) |  | (1,332) | (1,467)
Disposal | 967 |  | 1,529 | 1,061
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 1 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 19 |  | (65) | (1)
Ending balance | (11,788) |  | (11,582) | (11,715)
Telecommunications equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Impairment losses |  |  | 596 | 138
Telecommunications equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 715,692 |  | 705,372 | 695,076
Additions | 193 |  | 171 | 159
Disposal | (13,739) |  | (11,542) | (13,047)
Effect of foreign exchange differences | (172) |  | (35) | 69
Acquisitions through business combinations |  |  |  | 0
Others | 20,080 |  | 21,726 | 23,115
Ending balance | 722,054 |  | 715,692 | 705,372
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (596,497) |  | (582,205) | (568,767)
Depreciation expenses | (24,492) |  | (25,280) | (26,291)
Disposal | 13,712 |  | 11,512 | 13,033
Impairment losses |  |  | (596) | (138)
Effect of foreign exchange differences | 45 |  | 7 | (14)
Acquisitions through business combinations |  |  |  | 0
Others | 78 |  | 65 | (28)
Ending balance | (607,154) |  | (596,497) | (582,205)
Transportation equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 3,866 |  | 3,815 | 3,824
Additions | 1 |  | 1 | 0
Disposal | (62) |  | (54) | (69)
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 29 |  | 104 | 60
Ending balance | 3,834 |  | 3,866 | 3,815
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (3,237) |  | (2,750) | (2,208)
Depreciation expenses | (330) |  | (529) | (599)
Disposal | 63 |  | 54 | 69
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | (9) |  | (12) | (12)
Ending balance | (3,513) |  | (3,237) | (2,750)
Miscellaneous equipment [Member] | Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 8,943 |  | 8,737 | 8,643
Additions | 193 |  | 255 | 203
Disposal | (402) |  | (625) | (511)
Effect of foreign exchange differences | (3) |  | (4) | 0
Acquisitions through business combinations |  |  |  | 39
Others | 784 |  | 580 | 363
Ending balance | 9,515 |  | 8,943 | 8,737
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (6,803) |  | (6,741) | (6,443)
Depreciation expenses | (677) |  | (626) | (671)
Disposal | 389 |  | 583 | 425
Impairment losses |  |  | 0 | 0
Effect of foreign exchange differences | 2 |  | 4 | 0
Acquisitions through business combinations |  |  |  | (28)
Others | (116) |  | (23) | (24)
Ending balance | (7,205) |  | (6,803) | (6,741)
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 | 20,141 |  | 20,402 | 20,930
Additions | 25,574 |  | 23,295 | 23,993
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | (27,188) |  | (23,556) | (24,521)
Ending balance | 18,527 |  | 20,141 | 20,402
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 | 0
Effect of foreign exchange differences | 0 |  | 0 | 0
Acquisitions through business combinations |  |  |  | 0
Others | 0 |  | 0 | 0
Ending balance | $ 0 |  | $ 0 | $ 0

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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 2016-01-13 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e_viii&doctype=Standard -URIDate 2016-03-31 + Details
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