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Segment Information - Other Segment Information (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 operating segments [Line Items]        
Share of the profits of associates and joint ventures accounted for using equity method $ 419 $ 14 $ 515 $ 897
Interest income 205 7 189 306
Interest expenses 22 1 20 33
Operating costs and expenses 180,706   181,390 181,329
Depreciation and amortization 31,930   32,485 33,448
Capital expenditure 26,875 907 23,517 25,084
Impairment loss on property, plant and equipment 0 0 596 138
Reversal of impairment loss 11 $ 0 148 142
Domestic Fixed Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Interest income 21   15 19
Operating costs and expenses 62,795   64,230 64,960
Depreciation and amortization 15,614   16,414 17,487
Capital expenditure 11,647   9,846 10,196
Impairment loss on property, plant and equipment 0   0 22
Reversal of impairment loss 11   148 142
Mobile Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Interest income 15   11 19
Interest expenses 6   2 10
Operating costs and expenses 80,275   79,593 81,213
Depreciation and amortization 11,001   10,620 10,444
Capital expenditure 9,742   8,981 8,596
Impairment loss on property, plant and equipment 0   596 116
Internet Business [Member]        
Disclosure of operating segments [Line Items]        
Interest income 9   7 11
Operating costs and expenses 13,288   13,160 12,062
Depreciation and amortization 3,385   3,626 3,611
Capital expenditure 2,779   2,718 4,795
International Fixed Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Interest income 15   6 2
Operating costs and expenses 13,385   14,313 14,411
Depreciation and amortization 1,477   1,451 1,536
Capital expenditure 1,580   1,136 968
Other [Member]        
Disclosure of operating segments [Line Items]        
Share of the profits of associates and joint ventures accounted for using equity method 419   515 897
Interest income 145   150 255
Interest expenses 16   18 23
Operating costs and expenses 10,963   10,094 8,683
Depreciation and amortization 453   374 370
Capital expenditure $ 1,127   $ 836 $ 529