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Segment Information - Other Segment Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method $ 253 $ 8 $ 442 $ 421
Interest income 618 20 249 95
Interest expense 319 10 263 218
Depreciation and amortization 40,511   40,270 39,216
Capital expenditure 30,741 1,004 31,535 35,333
Gain (loss) on disposal of property, plant and equipment 0 0 5 3
Gain on disposal of investment properties, net 0 0 1 0
Impairment loss on right-of-use assets 0   0 420
Reversal of impairment loss on investment properties     107 83
Impairment loss on intangible assets 336   9 29
Impairment loss on property, plant and equipment 299 $ 10 0 0
Consumer Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method (129)   (43) (48)
Interest income 25   11 7
Interest expense 185   151 131
Depreciation and amortization 28,699   28,703 27,953
Impairment loss on right-of-use assets       5
Reversal of impairment loss on investment properties     0 0
Impairment loss on intangible assets 0   9 29
Impairment loss on property, plant and equipment 249      
Enterprise Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 29   23 11
Interest income 58   28 16
Interest expense 94   83 66
Depreciation and amortization 9,721   9,714 9,700
Impairment loss on right-of-use assets       382
Reversal of impairment loss on investment properties     0 0
Impairment loss on intangible assets 0   0 0
Impairment loss on property, plant and equipment 50      
International Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 283   315 272
Interest income 36   8 5
Interest expense 8   7 7
Depreciation and amortization 1,354   1,114 865
Impairment loss on right-of-use assets       33
Reversal of impairment loss on investment properties     0 0
Impairment loss on intangible assets 0   0 0
Impairment loss on property, plant and equipment 0      
Other [Member]        
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method 70   147 186
Interest income 499   202 67
Interest expense 32   22 14
Depreciation and amortization 737   739 698
Impairment loss on right-of-use assets       0
Reversal of impairment loss on investment properties     107 83
Impairment loss on intangible assets $ 336   $ 0 $ 0