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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

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