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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2023
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Assets Used by the Company Explanatory |
|  | December 31 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Assets used by the Company |  | $ | 285,329 |  |  | $ | 285,085 |
Assets subject to operating leases |  |  | 6,199 |  |  |  | 7,253 |
|  | $ | 291,528 |  |  | $ | 292,338 |
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, 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 |
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 |
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 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 118 |  |  | $ | 168 |
Year 2 |  |  | 99 |  |  |  | 157 |
Year 3 |  |  | 90 |  |  |  | 134 |
Year 4 |  |  | 70 |  |  |  | 105 |
Year 5 |  |  | 44 |  |  |  | 83 |
Onwards |  |  | 149 |  |  |  | 435 |
|  | $ | 570 |  |  | $ | 1,082 |
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, 2021 |  | $ | 4,973 |  |  | $ | 4,236 |  |  | $ | 9,209 |
Others |  |  | (164 | ) |  |  | (102 | ) |  |  | (266 | )
Balance on December 31, 2021 |  | $ | 4,809 |  |  | $ | 4,134 |  |  | $ | 8,943 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |
Balance on January 1, 2021 |  | $ | — |  |  | $ | (1,616 | ) |  | $ | (1,616 | )
Depreciation expenses |  |  | — |  |  |  | (77 | ) |  |  | (77 | )
Others |  |  | — |  |  |  | 1 |  |  |  | 1 |
Balance on December 31, 2021 |  | $ | — |  |  | $ | (1,692 | ) |  | $ | (1,692 | )
Balance on December 31, 2021, net |  | $ | 4,809 |  |  | $ | 2,442 |  |  | $ | 7,251 |
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 |
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 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 389 |  |  | $ | 381 |
Year 2 |  |  | 281 |  |  |  | 279 |
Year 3 |  |  | 211 |  |  |  | 221 |
Year 4 |  |  | 177 |  |  |  | 176 |
Year 5 |  |  | 149 |  |  |  | 146 |
Onwards |  |  | 1,122 |  |  |  | 1,025 |
|  | $ | 2,329 |  |  | $ | 2,228 |
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, 2021 |  | $ | 101,991 |  |  | $ | 1,630 |  |  | $ | 70,889 |  |  | $ | 12,406 |  |  | $ | 710,776 |  |  | $ | 3,894 |  |  | $ | 10,300 |  |  | $ | 8,529 |  |  | $ | 920,415 |
Additions |  |  | — |  |  |  | — |  |  |  | 37 |  |  |  | 72 |  |  |  | 84 |  |  |  | — |  |  |  | 198 |  |  |  | 35,222 |  |  |  | 35,613 |
Disposal |  |  | — |  |  |  | (1 | ) |  |  | (29 | ) |  |  | (1,734 | ) |  |  | (27,916 | ) |  |  | (84 | ) |  |  | (470 | ) |  |  | — |  |  |  | (30,234 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (64 | ) |  |  | — |  |  |  | (2 | ) |  |  | (6 | ) |  |  | (72 | )
Others |  |  | 654 |  |  |  | 33 |  |  |  | 461 |  |  |  | 473 |  |  |  | 30,654 |  |  |  | 117 |  |  |  | 783 |  |  |  | (32,959 | ) |  |  | 216 |
Balance on December 31, 2021 |  | $ | 102,645 |  |  | $ | 1,662 |  |  | $ | 71,358 |  |  | $ | 11,217 |  |  | $ | 713,534 |  |  | $ | 3,927 |  |  | $ | 10,809 |  |  | $ | 10,786 |  |  | $ | 925,938 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2021 |  | $ | — |  |  | $ | (1,399 | ) |  | $ | (29,247 | ) |  | $ | (10,639 | ) |  | $ | (593,663 | ) |  | $ | (3,718 | ) |  | $ | (7,926 | ) |  | $ | — |  |  | $ | (646,592 | )
Depreciation expenses |  |  | — |  |  |  | (43 | ) |  |  | (1,401 | ) |  |  | (716 | ) |  |  | (24,802 | ) |  |  | (65 | ) |  |  | (701 | ) |  |  | — |  |  |  | (27,728 | )
Disposal |  |  | — |  |  |  | 1 |  |  |  | 29 |  |  |  | 1,724 |  |  |  | 27,900 |  |  |  | 84 |  |  |  | 466 |  |  |  | — |  |  |  | 30,204 |
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 31 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 32 |
Others |  |  | — |  |  |  | (1 | ) |  |  | 41 |  |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | (45 | ) |  |  | — |  |  |  | (5 | )
Balance on December 31, 2021 |  | $ | — |  |  | $ | (1,442 | ) |  | $ | (30,578 | ) |  | $ | (9,632 | ) |  | $ | (590,533 | ) |  | $ | (3,699 | ) |  | $ | (8,205 | ) |  | $ | — |  |  | $ | (644,089 | )
Balance on December 31, 2021, net |  | $ | 102,645 |  |  | $ | 220 |  |  | $ | 40,780 |  |  | $ | 1,585 |  |  | $ | 123,001 |  |  | $ | 228 |  |  | $ | 2,604 |  |  | $ | 10,786 |  |  | $ | 281,849 |
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 |

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