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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Assets Used by the Company Explanatory |
|  | December 31 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Assets used by the Company |  | $ | 285,085 |  |  | $ | 284,715 |
Assets subject to operating leases |  |  | 7,253 |  |  |  | 5,125 |
|  | $ | 292,338 |  |  | $ | 289,840 |
Summary of Property, Plant and Equipment |
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Computer Equipment |  |  | Telecommuni- cations Equipment |  |  | Transportation Equipment |  |  | Miscellaneous Equipment |  |  | Construction in Progress and Equipment to be Accepted |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2023 |  | $ | — |  |  | $ | (1,474 | ) |  | $ | (32,263 | ) |  | $ | (9,554 | ) |  | $ | (597,957 | ) |  | $ | (3,673 | ) |  | $ | (8,642 | ) |  | $ | — |  |  | $ | (653,563 | )
Depreciation expenses |  |  | — |  |  |  | (34 | ) |  |  | (1,439 | ) |  |  | (698 | ) |  |  | (25,704 | ) |  |  | (94 | ) |  |  | (797 | ) |  |  | — |  |  |  | (28,766 | )
Disposal |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,049 |  |  |  | 24,867 |  |  |  | 113 |  |  |  | 411 |  |  |  | — |  |  |  | 26,440 |
Impairment losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (299 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (299 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 6 |
Others |  |  | — |  |  |  | — |  |  |  | 418 |  |  |  | (18 | ) |  |  | (43 | ) |  |  | (1 | ) |  |  | 4 |  |  |  | — |  |  |  | 360 |
Balance on December 31, 2023 |  | $ | — |  |  | $ | (1,508 | ) |  | $ | (33,284 | ) |  | $ | (9,221 | ) |  | $ | (599,131 | ) |  | $ | (3,655 | ) |  | $ | (9,023 | ) |  | $ | — |  |  | $ | (655,822 | )
Balance on December 31, 2023, net |  | $ | 102,885 |  |  | $ | 201 |  |  | $ | 38,471 |  |  | $ | 1,824 |  |  | $ | 122,304 |  |  | $ | 395 |  |  | $ | 3,068 |  |  | $ | 15,937 |  |  | $ | 285,085 |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2024 |  | $ | 102,885 |  |  | $ | 1,709 |  |  | $ | 71,755 |  |  | $ | 11,045 |  |  | $ | 721,435 |  |  | $ | 4,050 |  |  | $ | 12,091 |  |  | $ | 15,937 |  |  | $ | 940,907 |
Additions |  |  | — |  |  |  | — |  |  |  | 176 |  |  |  | 25 |  |  |  | 321 |  |  |  | 4 |  |  |  | 139 |  |  |  | 27,910 |  |  |  | 28,575 |
Disposal |  |  | — |  |  |  | — |  |  |  | (18 | ) |  |  | (1,240 | ) |  |  | (27,010 | ) |  |  | (154 | ) |  |  | (506 | ) |  |  | — |  |  |  | (28,928 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 167 |  |  |  | — |  |  |  | 9 |  |  |  | 16 |  |  |  | 192 |
Others |  |  | (539 | ) |  |  | 40 |  |  |  | 2,265 |  |  |  | 619 |  |  |  | 23,440 |  |  |  | 284 |  |  |  | 947 |  |  |  | (27,290 | ) |  |  | (234 | )
Balance on December 31, 2024 |  | $ | 102,346 |  |  | $ | 1,749 |  |  | $ | 74,178 |  |  | $ | 10,449 |  |  | $ | 718,353 |  |  | $ | 4,184 |  |  | $ | 12,680 |  |  | $ | 16,573 |  |  | $ | 940,512 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2024 |  | $ | — |  |  | $ | (1,508 | ) |  | $ | (33,284 | ) |  | $ | (9,221 | ) |  | $ | (599,131 | ) |  | $ | (3,655 | ) |  | $ | (9,023 | ) |  | $ | — |  |  | $ | (655,822 | )
Depreciation expenses |  |  | — |  |  |  | (36 | ) |  |  | (1,467 | ) |  |  | (747 | ) |  |  | (25,434 | ) |  |  | (128 | ) |  |  | (830 | ) |  |  | — |  |  |  | (28,642 | )
Disposal |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 1,240 |  |  |  | 27,003 |  |  |  | 153 |  |  |  | 485 |  |  |  | — |  |  |  | 28,898 |
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (105 | ) |  |  | — |  |  |  | (5 | ) |  |  | — |  |  |  | (110 | )
Others |  |  | — |  |  |  | — |  |  |  | 12 |  |  |  | 2 |  |  |  | (7 | ) |  |  | — |  |  |  | (128 | ) |  |  | — |  |  |  | (121 | )
Balance on December 31, 2024 |  | $ | — |  |  | $ | (1,544 | ) |  | $ | (34,722 | ) |  | $ | (8,726 | ) |  | $ | (597,674 | ) |  | $ | (3,630 | ) |  | $ | (9,501 | ) |  | $ | — |  |  | $ | (655,797 | )
Balance on December 31, 2024, net |  | $ | 102,346 |  |  | $ | 205 |  |  | $ | 39,456 |  |  | $ | 1,723 |  |  | $ | 120,679 |  |  | $ | 554 |  |  | $ | 3,179 |  |  | $ | 16,573 |  |  | $ | 284,715 |
Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory |
Land improvements |  | 10-30 years
Buildings |  |
Main buildings |  | 20-60 years
Other building facilities |  | 3-15 years
Computer equipment |  | 2-8 years
Telecommunications equipment |  |
Telecommunication circuits |  | 2-30 years
Telecommunication machinery and antennas equipment |  | 2-30 years
Transportation equipment |  | 2-10 years
Miscellaneous equipment |  |
Leasehold improvements |  | 1-18 years
Mechanical and air conditioner equipment |  | 3-16 years
Others |  | 1-15 years
Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment | The future aggregate lease collection under operating lease for investment properties is as follows:
|  | December 31 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 168 |  |  | $ | 274 |
Year 2 |  |  | 157 |  |  |  | 248 |
Year 3 |  |  | 134 |  |  |  | 217 |
Year 4 |  |  | 105 |  |  |  | 192 |
Year 5 |  |  | 83 |  |  |  | 190 |
Onwards |  |  | 435 |  |  |  | 1,306 |
|  | $ | 1,082 |  |  | $ | 2,427 |
Property, plant and equipment subject to operating leases [member] |
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Property, Plant and Equipment | b. Assets subject to operating leases
|  | Land |  |  | Buildings |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cost |  |  |  |  |  |  |  |  |
Balance on January 1, 2022 |  | $ | 4,809 |  |  | $ | 4,134 |  |  | $ | 8,943 |
Additions |  |  | — |  |  |  | — |  |  |  | — |
Others |  |  | (433 | ) |  |  | (949 | ) |  |  | (1,382 | )
Balance on December 31, 2022 |  | $ | 4,376 |  |  | $ | 3,185 |  |  | $ | 7,561 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |
Balance on January 1, 2022 |  | $ | — |  |  | $ | (1,692 | ) |  | $ | (1,692 | )
Depreciation expenses |  |  | — |  |  |  | (59 | ) |  |  | (59 | )
Others |  |  | — |  |  |  | 389 |  |  |  | 389 |
Balance on December 31, 2022 |  | $ | — |  |  | $ | (1,362 | ) |  | $ | (1,362 | )
Balance on December 31, 2022, net |  | $ | 4,376 |  |  | $ | 1,823 |  |  | $ | 6,199 |
Cost |  |  |  |  |  |  |  |  |
Balance on January 1, 2023 |  | $ | 4,376 |  |  | $ | 3,185 |  |  | $ | 7,561 |
Additions |  |  | — |  |  |  | 4 |  |  |  | 4 |
Others |  |  | 548 |  |  |  | 942 |  |  |  | 1,490 |
Balance on December 31, 2023 |  | $ | 4,924 |  |  | $ | 4,131 |  |  | $ | 9,055 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |
Balance on January 1, 2023 |  | $ | — |  |  | $ | (1,362 | ) |  | $ | (1,362 | )
Depreciation expenses |  |  | — |  |  |  | (73 | ) |  |  | (73 | )
Others |  |  | — |  |  |  | (367 | ) |  |  | (367 | )
Balance on December 31, 2023 |  | $ | — |  |  | $ | (1,802 | ) |  | $ | (1,802 | )
Balance on December 31, 2023, net |  | $ | 4,924 |  |  | $ | 2,329 |  |  | $ | 7,253 |
Cost |  |  |  |  |  |  |  |  |
Balance on January 1, 2024 |  | $ | 4,924 |  |  | $ | 4,131 |  |  | $ | 9,055 |
Additions |  |  | — |  |  |  | 1 |  |  |  | 1 |
Others |  |  | (1,820 | ) |  |  | (394 | ) |  |  | (2,214 | )
Balance on December 31, 2024 |  | $ | 3,104 |  |  | $ | 3,738 |  |  | $ | 6,842 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |
Balance on January 1, 2024 |  | $ | — |  |  | $ | (1,802 | ) |  | $ | (1,802 | )
Depreciation expenses |  |  | — |  |  |  | (65 | ) |  |  | (65 | )
Others |  |  | — |  |  |  | 150 |  |  |  | 150 |
Balance on December 31, 2024 |  | $ | — |  |  | $ | (1,717 | ) |  | $ | (1,717 | )
Balance on December 31, 2024, net |  | $ | 3,104 |  |  | $ | 2,021 |  |  | $ | 5,125 |
Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory |
Buildings |  |
Main buildings |  | 35-60 years
Other building facilities |  | 3-15 years
Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment |
|  | December 31 |
|  | 2023 |  |  | 2024 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 381 |  |  | $ | 305 |
Year 2 |  |  | 279 |  |  |  | 198 |
Year 3 |  |  | 221 |  |  |  | 122 |
Year 4 |  |  | 176 |  |  |  | 92 |
Year 5 |  |  | 146 |  |  |  | 62 |
Onwards |  |  | 1,025 |  |  |  | 137 |
|  | $ | 2,228 |  |  | $ | 916 |
Assets Used by the Company [Member] |
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Property, Plant and Equipment |
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Computer Equipment |  |  | Telecommuni- cations Equipment |  |  | Transportation Equipment |  |  | Miscellaneous Equipment |  |  | Construction in Progress and Equipment to be Accepted |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2022 |  | $ | 102,645 |  |  | $ | 1,662 |  |  | $ | 71,358 |  |  | $ | 11,217 |  |  | $ | 713,534 |  |  | $ | 3,927 |  |  | $ | 10,809 |  |  | $ | 10,786 |  |  | $ | 925,938 |
Additions |  |  | 460 |  |  |  | — |  |  |  | 133 |  |  |  | 102 |  |  |  | 149 |  |  |  | 1 |  |  |  | 253 |  |  |  | 30,167 |  |  |  | 31,265 |
Disposal |  |  | (4 | ) |  |  | (6 | ) |  |  | (7 | ) |  |  | (808 | ) |  |  | (18,395 | ) |  |  | (104 | ) |  |  | (392 | ) |  |  | — |  |  |  | (19,716 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 209 |  |  |  | — |  |  |  | 4 |  |  |  | 19 |  |  |  | 232 |
Others |  |  | 563 |  |  |  | 19 |  |  |  | 1,046 |  |  |  | 578 |  |  |  | 24,571 |  |  |  | 147 |  |  |  | 794 |  |  |  | (26,545 | ) |  |  | 1,173 |
Balance on December 31, 2022 |  | $ | 103,664 |  |  | $ | 1,675 |  |  | $ | 72,530 |  |  | $ | 11,089 |  |  | $ | 720,068 |  |  | $ | 3,971 |  |  | $ | 11,468 |  |  | $ | 14,427 |  |  | $ | 938,892 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2022 |  | $ | — |  |  | $ | (1,442 | ) |  | $ | (30,578 | ) |  | $ | (9,632 | ) |  | $ | (590,533 | ) |  | $ | (3,699 | ) |  | $ | (8,205 | ) |  | $ | — |  |  | $ | (644,089 | )
Depreciation expenses |  |  | — |  |  |  | (39 | ) |  |  | (1,452 | ) |  |  | (725 | ) |  |  | (25,654 | ) |  |  | (77 | ) |  |  | (754 | ) |  |  | — |  |  |  | (28,701 | )
Disposal |  |  | — |  |  |  | 7 |  |  |  | 7 |  |  |  | 807 |  |  |  | 18,382 |  |  |  | 104 |  |  |  | 388 |  |  |  | — |  |  |  | 19,695 |
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (110 | ) |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | (112 | )
Others |  |  | — |  |  |  | — |  |  |  | (240 | ) |  |  | (4 | ) |  |  | (42 | ) |  |  | (1 | ) |  |  | (69 | ) |  |  | — |  |  |  | (356 | )
Balance on December 31, 2022 |  | $ | — |  |  | $ | (1,474 | ) |  | $ | (32,263 | ) |  | $ | (9,554 | ) |  | $ | (597,957 | ) |  | $ | (3,673 | ) |  | $ | (8,642 | ) |  | $ | — |  |  | $ | (653,563 | )
Balance on December 31, 2022, net |  | $ | 103,664 |  |  | $ | 201 |  |  | $ | 40,267 |  |  | $ | 1,535 |  |  | $ | 122,111 |  |  | $ | 298 |  |  | $ | 2,826 |  |  | $ | 14,427 |  |  | $ | 285,329 |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2023 |  | $ | 103,664 |  |  | $ | 1,675 |  |  | $ | 72,530 |  |  | $ | 11,089 |  |  | $ | 720,068 |  |  | $ | 3,971 |  |  | $ | 11,468 |  |  | $ | 14,427 |  |  |  | 938,892 |
Additions |  |  | 99 |  |  |  | — |  |  |  | 36 |  |  |  | 127 |  |  |  | 106 |  |  |  | 3 |  |  |  | 243 |  |  |  | 29,780 |  |  |  | 30,394 |
Disposal |  |  | (2 | ) |  |  | — |  |  |  | (1 | ) |  |  | (1,049 | ) |  |  | (24,877 | ) |  |  | (112 | ) |  |  | (418 | ) |  |  | — |  |  |  | (26,459 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5 | ) |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | (8 | )
Others |  |  | (876 | ) |  |  | 34 |  |  |  | (810 | ) |  |  | 878 |  |  |  | 26,143 |  |  |  | 188 |  |  |  | 801 |  |  |  | (28,270 | ) |  |  | (1,912 | )
Balance on December 31, 2023 |  | $ | 102,885 |  |  | $ | 1,709 |  |  | $ | 71,755 |  |  | $ | 11,045 |  |  | $ | 721,435 |  |  | $ | 4,050 |  |  | $ | 12,091 |  |  | $ | 15,937 |  |  | $ | 940,907 |

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