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Property, Plant and Equipment - Summary of Property, Plant and Equipment - Asset Used by The Company (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 292,338,000,000 |  |  |
Depreciation expenses | (28,707,000,000) |  | $ (28,839,000,000) | $ (28,760,000,000)
Impairment losses | 0 | $ 0 | (299,000,000) | 0
Ending balance | 289,840,000,000 | $ 8,839 | 292,338,000,000 |
Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 285,085,000,000 |  | 285,329,000,000 |
Impairment losses | 0 |  | (299,000,000) | 0
Ending balance | 284,715,000,000 |  | 285,085,000,000 | 285,329,000,000
Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 940,907,000,000 |  | 938,892,000,000 | 925,938,000,000
Additions | 28,575,000,000 |  | 30,394,000,000 | 31,265,000,000
Disposal | (28,928,000,000) |  | (26,459,000,000) | (19,716,000,000)
Effect of foreign exchange differences | 192,000,000 |  | (8,000,000) | 232,000,000
Others | (234,000,000) |  | (1,912,000,000) | 1,173,000,000
Ending balance | 940,512,000,000 |  | 940,907,000,000 | 938,892,000,000
Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (655,822,000,000) |  | (653,563,000,000) | (644,089,000,000)
Depreciation expenses | (28,642,000,000) |  | (28,766,000,000) | (28,701,000,000)
Disposal | 28,898,000,000 |  | 26,440,000,000 | 19,695,000,000
Impairment losses |  |  | (299,000,000) |
Effect of foreign exchange differences | (110,000,000) |  | 6,000,000 | (112,000,000)
Others | (121,000,000) |  | 360,000,000 | (356,000,000)
Ending balance | (655,797,000,000) |  | (655,822,000,000) | (653,563,000,000)
Land [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 102,885,000,000 |  | 103,664,000,000 |
Ending balance | 102,346,000,000 |  | 102,885,000,000 | 103,664,000,000
Land [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 102,885,000,000 |  | 103,664,000,000 | 102,645,000,000
Additions | 0 |  | 99,000,000 | 460,000,000
Disposal | 0 |  | (2,000,000) | (4,000,000)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | (539,000,000) |  | (876,000,000) | 563,000,000
Ending balance | 102,346,000,000 |  | 102,885,000,000 | 103,664,000,000
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses | 0 |  | 0 | 0
Disposal | 0 |  | 0 | 0
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 0 |  | 0 | 0
Land improvements [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 201,000,000 |  | 201,000,000 |
Ending balance | 205,000,000 |  | 201,000,000 | 201,000,000
Land improvements [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,709,000,000 |  | 1,675,000,000 | 1,662,000,000
Additions | 0 |  | 0 | 0
Disposal | 0 |  | 0 | (6,000,000)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 40,000,000 |  | 34,000,000 | 19,000,000
Ending balance | 1,749,000,000 |  | 1,709,000,000 | 1,675,000,000
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,508,000,000) |  | (1,474,000,000) | (1,442,000,000)
Depreciation expenses | (36,000,000) |  | (34,000,000) | (39,000,000)
Disposal | 0 |  | 0 | 7,000,000
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | (1,544,000,000) |  | (1,508,000,000) | (1,474,000,000)
Buildings [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 38,471,000,000 |  | 40,267,000,000 |
Ending balance | 39,456,000,000 |  | 38,471,000,000 | 40,267,000,000
Buildings [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 71,755,000,000 |  | 72,530,000,000 | 71,358,000,000
Additions | 176,000,000 |  | 36,000,000 | 133,000,000
Disposal | (18,000,000) |  | (1,000,000) | (7,000,000)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 2,265,000,000 |  | (810,000,000) | 1,046,000,000
Ending balance | 74,178,000,000 |  | 71,755,000,000 | 72,530,000,000
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (33,284,000,000) |  | (32,263,000,000) | (30,578,000,000)
Depreciation expenses | (1,467,000,000) |  | (1,439,000,000) | (1,452,000,000)
Disposal | 17,000,000 |  | 0 | 7,000,000
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 12,000,000 |  | 418,000,000 | (240,000,000)
Ending balance | (34,722,000,000) |  | (33,284,000,000) | (32,263,000,000)
Computer equipment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,824,000,000 |  | 1,535,000,000 |
Ending balance | 1,723,000,000 |  | 1,824,000,000 | 1,535,000,000
Computer equipment [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 11,045,000,000 |  | 11,089,000,000 | 11,217,000,000
Additions | 25,000,000 |  | 127,000,000 | 102,000,000
Disposal | (1,240,000,000) |  | (1,049,000,000) | (808,000,000)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 619,000,000 |  | 878,000,000 | 578,000,000
Ending balance | 10,449,000,000 |  | 11,045,000,000 | 11,089,000,000
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (9,221,000,000) |  | (9,554,000,000) | (9,632,000,000)
Depreciation expenses | (747,000,000) |  | (698,000,000) | (725,000,000)
Disposal | 1,240,000,000 |  | 1,049,000,000 | 807,000,000
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 2,000,000 |  | (18,000,000) | (4,000,000)
Ending balance | (8,726,000,000) |  | (9,221,000,000) | (9,554,000,000)
Telecommunications equipment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 122,304,000,000 |  | 122,111,000,000 |
Ending balance | 120,679,000,000 |  | 122,304,000,000 | 122,111,000,000
Telecommunications equipment [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 721,435,000,000 |  | 720,068,000,000 | 713,534,000,000
Additions | 321,000,000 |  | 106,000,000 | 149,000,000
Disposal | (27,010,000,000) |  | (24,877,000,000) | (18,395,000,000)
Effect of foreign exchange differences | 167,000,000 |  | (5,000,000) | 209,000,000
Others | 23,440,000,000 |  | 26,143,000,000 | 24,571,000,000
Ending balance | 718,353,000,000 |  | 721,435,000,000 | 720,068,000,000
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (599,131,000,000) |  | (597,957,000,000) | (590,533,000,000)
Depreciation expenses | (25,434,000,000) |  | (25,704,000,000) | (25,654,000,000)
Disposal | 27,003,000,000 |  | 24,867,000,000 | 18,382,000,000
Impairment losses |  |  | (299,000,000) |
Effect of foreign exchange differences | (105,000,000) |  | 5,000,000 | (110,000,000)
Others | (7,000,000) |  | (43,000,000) | (42,000,000)
Ending balance | (597,674,000,000) |  | (599,131,000,000) | (597,957,000,000)
Transportation equipment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 395,000,000 |  | 298,000,000 |
Ending balance | 554,000,000 |  | 395,000,000 | 298,000,000
Transportation equipment [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 4,050,000,000 |  | 3,971,000,000 | 3,927,000,000
Additions | 4,000,000 |  | 3,000,000 | 1,000,000
Disposal | (154,000,000) |  | (112,000,000) | (104,000,000)
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 284,000,000 |  | 188,000,000 | 147,000,000
Ending balance | 4,184,000,000 |  | 4,050,000,000 | 3,971,000,000
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (3,655,000,000) |  | (3,673,000,000) | (3,699,000,000)
Depreciation expenses | (128,000,000) |  | (94,000,000) | (77,000,000)
Disposal | 153,000,000 |  | 113,000,000 | 104,000,000
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | (1,000,000) | (1,000,000)
Ending balance | (3,630,000,000) |  | (3,655,000,000) | (3,673,000,000)
Miscellaneous equipment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,068,000,000 |  | 2,826,000,000 |
Ending balance | 3,179,000,000 |  | 3,068,000,000 | 2,826,000,000
Miscellaneous equipment [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 12,091,000,000 |  | 11,468,000,000 | 10,809,000,000
Additions | 139,000,000 |  | 243,000,000 | 253,000,000
Disposal | (506,000,000) |  | (418,000,000) | (392,000,000)
Effect of foreign exchange differences | 9,000,000 |  | (3,000,000) | 4,000,000
Others | 947,000,000 |  | 801,000,000 | 794,000,000
Ending balance | 12,680,000,000 |  | 12,091,000,000 | 11,468,000,000
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (9,023,000,000) |  | (8,642,000,000) | (8,205,000,000)
Depreciation expenses | (830,000,000) |  | (797,000,000) | (754,000,000)
Disposal | 485,000,000 |  | 411,000,000 | 388,000,000
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | (5,000,000) |  | 1,000,000 | (2,000,000)
Others | (128,000,000) |  | 4,000,000 | (69,000,000)
Ending balance | (9,501,000,000) |  | (9,023,000,000) | (8,642,000,000)
Construction in Progress and Equipment to be Accepted [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 15,937,000,000 |  | 14,427,000,000 |
Ending balance | 16,573,000,000 |  | 15,937,000,000 | 14,427,000,000
Construction in Progress and Equipment to be Accepted [Member] | Gross carrying amount [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 15,937,000,000 |  | 14,427,000,000 | 10,786,000,000
Additions | 27,910,000,000 |  | 29,780,000,000 | 30,167,000,000
Disposal | 0 |  | 0 | 0
Effect of foreign exchange differences | 16,000,000 |  | 0 | 19,000,000
Others | (27,290,000,000) |  | (28,270,000,000) | (26,545,000,000)
Ending balance | 16,573,000,000 |  | 15,937,000,000 | 14,427,000,000
Construction in Progress and Equipment to be Accepted [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses | 0 |  | 0 | 0
Disposal | 0 |  | 0 | 0
Impairment losses |  |  | 0 |
Effect of foreign exchange differences | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | $ 0 |  | $ 0 | $ 0

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