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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 |

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