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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2017
TWD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     $ 47,353      
Additions-acquired separately $ 10,935 $ 9,955        
Amortization expenses     (3,766)   $ (3,379) $ (3,080)
Impairment losses     (9) $ 0 0 0
Ending balance     54,883 $ 1,852 47,353  
Gross carrying amount [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     63,267   63,103 52,778
Additions-acquired separately     11,305   282 10,380
Disposal     (462)   (121) (377)
Effect of foreign exchange difference     0   0 0
Acquisitions through business combinations           314
Others         3 8
Ending balance   63,103 74,110   63,267 63,103
Accumulated depreciation, amortization and impairment [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     (15,914)   (12,656) (9,953)
Amortization expenses     (3,766)   (3,379) (3,080)
Disposal     462   121 377
Impairment losses     (9)   0  
Effect of foreign exchange difference     0   0 0
Others           0
Ending balance   (12,656) (19,227)   (15,914) (12,656)
3G and 4G concession [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     45,796      
Ending balance     53,469   45,796  
3G and 4G concession [Member] | Gross carrying amount [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     59,209   59,209 49,254
Additions-acquired separately     10,935   0 9,955
Disposal     0   0 0
Effect of foreign exchange difference     0   0 0
Acquisitions through business combinations           0
Others         0 0
Ending balance   59,209 70,144   59,209 59,209
3G and 4G concession [Member] | Accumulated depreciation, amortization and impairment [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     (13,413)   (10,608) (8,104)
Amortization expenses     (3,262)   (2,805) (2,504)
Disposal     0   0 0
Impairment losses     0   0  
Effect of foreign exchange difference     0   0 0
Others           0
Ending balance   (10,608) (16,675)   (13,413) (10,608)
Computer software [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     995      
Ending balance     880   995  
Computer software [Member] | Gross carrying amount [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     3,408   3,249 3,192
Additions-acquired separately     366   277 424
Disposal     (462)   (121) (375)
Effect of foreign exchange difference     0   0 0
Acquisitions through business combinations           0
Others         3 8
Ending balance   3,249 3,312   3,408 3,249
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     (2,413)   (1,983) (1,793)
Amortization expenses     (481)   (551) (565)
Disposal     462   121 375
Impairment losses     0   0  
Effect of foreign exchange difference     0   0 0
Others           0
Ending balance   (1,983) (2,432)   (2,413) (1,983)
Goodwill [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     218      
Ending balance     209   218  
Goodwill [Member] | Gross carrying amount [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     236   236 181
Additions-acquired separately     0   0 0
Disposal     0   0 0
Effect of foreign exchange difference     0   0 0
Acquisitions through business combinations           55
Others         0 0
Ending balance   236 236   236 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     (18)   (18) (18)
Amortization expenses     0   0 0
Disposal     0   0 0
Impairment losses     (9)   0  
Effect of foreign exchange difference     0   0 0
Others           0
Ending balance   (18) (27)   (18) (18)
Others [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     344      
Ending balance     325   344  
Others [Member] | Gross carrying amount [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     414   409 151
Additions-acquired separately     4   5 1
Disposal     0   0 (2)
Effect of foreign exchange difference     0   0 0
Acquisitions through business combinations           259
Others         0 0
Ending balance   409 418   414 409
Others [Member] | Accumulated depreciation, amortization and impairment [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Beginning balance     (70)   (47) (38)
Amortization expenses     (23)   (23) (11)
Disposal     0   0 2
Impairment losses     0   0  
Effect of foreign exchange difference     0   0 0
Others           0
Ending balance   $ (47) $ (93)   $ (70) $ (47)