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Segment Information - Other Segment Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method $ 244 $ 9 $ 459 $ 509
Interest income 116 4 251 197
Interest expenses 206 7 104 18
Operating costs and expenses 166,843   166,747 171,949
Depreciation and amortization 37,138   36,349 33,809
Capital expenditure 23,511 838 24,166 28,550
Gain (loss) on disposal of property, plant and equipment 1,428 51 (38) 142
Gain on disposal of investment properties 151 5 0 0
Impairment loss on property, plant and equipment 0 0 93 0
Reversal of impairment loss 27 1 57 19
Impairment loss on intangible assets 9   9 51
Impairment loss on other assets 0 $ 0 44 0
Domestic Fixed Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 0   0 0
Interest income 13   15 18
Interest expenses 6   5 0
Operating costs and expenses 59,371   56,269 59,430
Depreciation and amortization 14,250   14,842 15,027
Capital expenditure 11,483   12,071 12,693
Gain (loss) on disposal of property, plant and equipment 1,442      
Gain on disposal of investment properties 151      
Impairment loss on property, plant and equipment     0  
Reversal of impairment loss 27   57 19
Impairment loss on intangible assets 0   0 0
Impairment loss on other assets     13  
Mobile Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 0   0 0
Interest income 5   9 12
Interest expenses 56   58 0
Operating costs and expenses 69,211   72,952 73,901
Depreciation and amortization 17,800   16,254 13,788
Capital expenditure 8,827   7,773 10,664
Gain (loss) on disposal of property, plant and equipment (3)      
Gain on disposal of investment properties 0      
Impairment loss on property, plant and equipment     0  
Reversal of impairment loss 0   0 0
Impairment loss on intangible assets 9   9 51
Impairment loss on other assets     0  
Internet Business [Member]        
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 0   0 0
Interest income 17   20 19
Interest expenses 1   1 0
Operating costs and expenses 15,241   13,850 13,766
Depreciation and amortization 2,669   2,914 3,121
Capital expenditure 1,397   1,425 2,729
Gain (loss) on disposal of property, plant and equipment 0      
Gain on disposal of investment properties 0      
Impairment loss on property, plant and equipment     0  
Reversal of impairment loss 0   0 0
Impairment loss on intangible assets 0   0 0
Impairment loss on other assets     13  
International Fixed Communications Business [Member]        
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 0   0 0
Interest income 22   41 28
Interest expenses 10   12 0
Operating costs and expenses 8,573   11,427 13,279
Depreciation and amortization 1,450   1,547 1,425
Capital expenditure 779   1,117 1,348
Gain (loss) on disposal of property, plant and equipment 0      
Gain on disposal of investment properties 0      
Impairment loss on property, plant and equipment     0  
Reversal of impairment loss 0   0 0
Impairment loss on intangible assets 0   0 0
Impairment loss on other assets     0  
Other [Member]        
Disclosure of operating segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 244   459 509
Interest income 59   166 120
Interest expenses 133   28 18
Operating costs and expenses 14,447   12,249 11,573
Depreciation and amortization 969   792 448
Capital expenditure 1,025   1,780 1,116
Gain (loss) on disposal of property, plant and equipment (11)      
Gain on disposal of investment properties 0      
Impairment loss on property, plant and equipment     93  
Reversal of impairment loss 0   0 0
Impairment loss on intangible assets $ 0   0 $ 0
Impairment loss on other assets     $ 18