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Segment Information - Other Segment Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method $ 421 $ 15 $ 244 $ 459
Interest income 95 3 116 251
Interest expense 218 8 206 104
Operating costs and expenses 165,179   166,843 166,747
Depreciation and amortization 39,216   37,138 36,349
Capital expenditure 35,333 1,274 23,511 24,166
Gain (loss) on disposal of property, plant and equipment (3) 0 1,428 (38)
Gain on disposal of investment properties, net 0 0 151 0
Impairment loss on right-of-use assets 420   0 0
Impairment loss on property, plant and equipment 0 0 0 93
Reversal of impairment loss on investment properties 83 3 27 57
Impairment loss on intangible assets 29   9 9
Impairment loss on other assets 0 $ 0 0 44
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 7   13 15
Interest expense 4   6 5
Operating costs and expenses 51,013   59,371 56,269
Depreciation and amortization 13,978   14,250 14,842
Capital expenditure 13,299   11,483 12,071
Gain (loss) on disposal of property, plant and equipment     1,442  
Gain on disposal of investment properties, net     151  
Impairment loss on right-of-use assets 0      
Impairment loss on property, plant and equipment       0
Reversal of impairment loss on investment properties 83   27 57
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 4   5 9
Interest expense 48   56 58
Operating costs and expenses 74,973   69,211 72,952
Depreciation and amortization 20,313   17,800 16,254
Capital expenditure 16,809   8,827 7,773
Gain (loss) on disposal of property, plant and equipment     (3)  
Gain on disposal of investment properties, net     0  
Impairment loss on right-of-use assets 0      
Impairment loss on property, plant and equipment       0
Reversal of impairment loss on investment properties 0   0 0
Impairment loss on intangible assets 29   9 9
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 13   17 20
Interest expense 1   1 1
Operating costs and expenses 14,150   15,241 13,850
Depreciation and amortization 2,471   2,669 2,914
Capital expenditure 2,943   1,397 1,425
Gain (loss) on disposal of property, plant and equipment     0  
Gain on disposal of investment properties, net     0  
Impairment loss on right-of-use assets 0      
Impairment loss on property, plant and equipment       0
Reversal of impairment loss on investment properties 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 5   22 41
Interest expense 8   10 12
Operating costs and expenses 8,409   8,573 11,427
Depreciation and amortization 1,417   1,450 1,547
Capital expenditure 445   779 1,117
Gain (loss) on disposal of property, plant and equipment     0  
Gain on disposal of investment properties, net     0  
Impairment loss on right-of-use assets 420      
Impairment loss on property, plant and equipment       0
Reversal of impairment loss on investment properties 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 421   244 459
Interest income 66   59 166
Interest expense 157   133 28
Operating costs and expenses 16,634   14,447 12,249
Depreciation and amortization 1,037   969 792
Capital expenditure 1,837   1,025 1,780
Gain (loss) on disposal of property, plant and equipment     (11)  
Gain on disposal of investment properties, net     0  
Impairment loss on right-of-use assets 0      
Impairment loss on property, plant and equipment       93
Reversal of impairment loss on investment properties 0   0 0
Impairment loss on intangible assets $ 0   $ 0 0
Impairment loss on other assets       $ 18