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Segment Information - Other Segment Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method $ 157 $ 5 $ 253 $ 442
Interest income 781 24 618 249
Interest expense 339 10 319 263
Depreciation and amortization 40,525   40,511 40,270
Capital expenditure 28,756 877 30,741 31,535
Gain (loss) on disposal of property, plant and equipment (17) (1) 0 (5)
Gain on disposal of investment properties, net 1 0 0 1
Reversal of impairment loss on investment properties 139     107
Impairment loss on intangible assets 139   336 9
Impairment loss on property, plant and equipment 0 $ 0 299 0
Consumer Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Share of profits of associates and joint ventures accounted for using equity method (303)   (129) (43)
Interest income 29   25 11
Interest expense 199   185 151
Depreciation and amortization 28,421   28,699 28,703
Reversal of impairment loss on investment properties       0
Impairment loss on intangible assets 0   0 9
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 55   29 23
Interest income 56   58 28
Interest expense 98   94 83
Depreciation and amortization 9,943   9,721 9,714
Reversal of impairment loss on investment properties       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 277   283 315
Interest income 58   36 8
Interest expense 8   8 7
Depreciation and amortization 1,422   1,354 1,114
Reversal of impairment loss on investment properties       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 128   70 147
Interest income 638   499 202
Interest expense 34   32 22
Depreciation and amortization 739   737 739
Reversal of impairment loss on investment properties       107
Impairment loss on intangible assets $ 139   336 $ 0
Impairment loss on property, plant and equipment     $ 0