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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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