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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure of operating segments [abstract] |
Analysis by Reportable Segment of Revenue and Operating Results of Continuing Operations |
|  | Consumer Business |  |  | Enterprise Business |  |  | International Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 132,063 |  |  | $ | 72,152 |  |  | $ | 7,189 |  |  | $ | 5,335 |  |  | $ | 216,739 |
Intersegment revenues |  |  | 2,166 |  |  |  | 952 |  |  |  | 864 |  |  |  | 348 |  |  |  | 4,330 |
Segment revenues |  | $ | 134,229 |  |  | $ | 73,104 |  |  | $ | 8,053 |  |  | $ | 5,683 |  |  |  | 221,069 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,330 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 216,739 |
Segment income before income tax |  | $ | 28,505 |  |  | $ | 15,607 |  |  | $ | 1,694 |  |  | $ | 1,398 |  |  | $ | 47,204 |
Year ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 137,093 |  |  | $ | 73,005 |  |  | $ | 9,188 |  |  | $ | 3,913 |  |  | $ | 223,199 |
Intersegment revenues |  |  | 2,626 |  |  |  | 1,014 |  |  |  | 995 |  |  |  | 406 |  |  |  | 5,041 |
Segment revenues |  | $ | 139,719 |  |  | $ | 74,019 |  |  | $ | 10,183 |  |  | $ | 4,319 |  |  |  | 228,240 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,041 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 223,199 |
Segment income before income tax |  | $ | 28,907 |  |  | $ | 14,363 |  |  | $ | 2,141 |  |  | $ | 1,597 |  |  | $ | 47,008 |
Year ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 139,982 |  |  | $ | 75,338 |  |  | $ | 9,919 |  |  | $ | 4,729 |  |  | $ | 229,968 |
Intersegment revenues |  |  | 2,765 |  |  |  | 884 |  |  |  | 1,107 |  |  |  | 376 |  |  |  | 5,132 |
Segment revenues |  | $ | 142,747 |  |  | $ | 76,222 |  |  | $ | 11,026 |  |  | $ | 5,105 |  |  |  | 235,100 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,132 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 229,968 |
Segment income before income tax |  | $ | 29,771 |  |  | $ | 12,881 |  |  | $ | 2,383 |  |  | $ | 2,806 |  |  | $ | 47,841 |
Other Segment Information | For the year ended December 31, 2022
|  | Consumer Business |  |  | Enterprise Business |  |  | International Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of profits (loss) of associates and joint ventures accounted for using equity method |  | $ | (43 | ) |  | $ | 23 |  |  | $ | 315 |  |  | $ | 147 |  |  | $ | 442 |
Interest income |  | $ | 11 |  |  | $ | 28 |  |  | $ | 8 |  |  | $ | 202 |  |  | $ | 249 |
Interest expenses |  | $ | 151 |  |  | $ | 83 |  |  | $ | 7 |  |  | $ | 22 |  |  | $ | 263 |
Depreciation and amortization |  | $ | 28,703 |  |  | $ | 9,714 |  |  | $ | 1,114 |  |  | $ | 739 |  |  | $ | 40,270 |
Reversal of impairment loss on investment properties |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 107 |  |  | $ | 107 |
Impairment loss on intangible assets |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |
For the year ended December 31, 2023
|  | Consumer Business |  |  | Enterprise Business |  |  | International Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of profits (loss) of associates and joint ventures accounted for using equity method |  | $ | (129 | ) |  | $ | 29 |  |  | $ | 283 |  |  | $ | 70 |  |  | $ | 253 |
Interest income |  | $ | 25 |  |  | $ | 58 |  |  | $ | 36 |  |  | $ | 499 |  |  | $ | 618 |
Interest expenses |  | $ | 185 |  |  | $ | 94 |  |  | $ | 8 |  |  | $ | 32 |  |  | $ | 319 |
Depreciation and amortization |  | $ | 28,699 |  |  | $ | 9,721 |  |  | $ | 1,354 |  |  | $ | 737 |  |  | $ | 40,511 |
Impairment loss on investment properties |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 336 |  |  | $ | 336 |
Impairment loss on property, plant and equipment |  | $ | 249 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 299 |
For the year ended December 31, 2024
|  | Consumer Business |  |  | Enterprise Business |  |  | International Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of profits (loss) of associates and joint ventures accounted for using equity method |  | $ | (303 | ) |  | $ | 55 |  |  | $ | 277 |  |  | $ | 128 |  |  | $ | 157 |
Interest income |  | $ | 29 |  |  | $ | 56 |  |  | $ | 58 |  |  | $ | 638 |  |  | $ | 781 |
Interest expenses |  | $ | 199 |  |  | $ | 98 |  |  | $ | 8 |  |  | $ | 34 |  |  | $ | 339 |
Depreciation and amortization |  | $ | 28,421 |  |  | $ | 9,943 |  |  | $ | 1,422 |  |  | $ | 739 |  |  | $ | 40,525 |
Reversal of impairment loss on investment properties |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 139 |  |  | $ | 139 |
Main Products and Service Revenues |
|  | Year Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Consumer Business |  |  |  |  |  |  |  |  |
Mobile services |  | $ | 51,821 |  |  | $ | 55,138 |  |  | $ | 57,067 |
Fixed-line services |  |  | 42,766 |  |  |  | 42,574 |  |  |  | 42,872 |
Sales |  |  | 35,172 |  |  |  | 36,816 |  |  |  | 37,231 |
Others |  |  | 2,304 |  |  |  | 2,565 |  |  |  | 2,812 |
|  |  | 132,063 |  |  |  | 137,093 |  |  |  | 139,982 |
Enterprise Business |  |  |  |  |  |  |  |  |
Fixed-line services |  |  | 34,537 |  |  |  | 33,967 |  |  |  | 33,757 |
ICT business |  |  | 24,248 |  |  |  | 24,697 |  |  |  | 27,792 |
Mobile services |  |  | 8,942 |  |  |  | 9,119 |  |  |  | 9,152 |
Others |  |  | 4,425 |  |  |  | 5,222 |  |  |  | 4,637 |
|  |  | 72,152 |  |  |  | 73,005 |  |  |  | 75,338 |
International Business |  |  |  |  |  |  |  |  |
Fixed-line services |  |  | 5,063 |  |  |  | 5,389 |  |  |  | 5,087 |
ICT business |  |  | 1,506 |  |  |  | 2,841 |  |  |  | 4,016 |
Others |  |  | 620 |  |  |  | 958 |  |  |  | 816 |
|  |  | 7,189 |  |  |  | 9,188 |  |  |  | 9,919 |
Others |  |  |  |  |  |  |  |  |
Sales |  |  | 4,553 |  |  |  | 3,034 |  |  |  | 3,803 |
Others |  |  | 782 |  |  |  | 879 |  |  |  | 926 |
|  |  | 5,335 |  |  |  | 3,913 |  |  |  | 4,729 |
|  | $ | 216,739 |  |  | $ | 223,199 |  |  | $ | 229,968 |
Geographic Information |
|  | Year Ended December 31 |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Taiwan, ROC |  | $ | 209,727 |  |  | $ | 215,265 |  |  | $ | 220,398 |
Overseas |  |  | 7,012 |  |  |  | 7,934 |  |  |  | 9,570 |
|  | $ | 216,739 |  |  | $ | 223,199 |  |  | $ | 229,968 |

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