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v3.25.1

Net Income - Depreciation and Amortization Expenses (Detail) $ in Millions, $ 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 Depreciation And Amortization [Line Items] |  |  |  |
Property, plant and equipment | $ 28,707 |  | $ 28,839 | $ 28,760
Right-of-use assets | 4,168 |  | 4,072 | 3,982
Investment properties | 45 |  | 45 | 44
Intangible assets | 6,699 |  | 6,699 | 6,643
Incremental costs of obtaining contracts | 906 | $ 28 | 856 | 841
Total depreciation and amortization expenses | 40,525 |  | 40,511 | 40,270
Depreciation expenses | 32,920 | $ 1,004 | 32,956 | 32,786
Amortization expenses | 7,605 |  | 7,555 | 7,484
Operating costs [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 30,770 |  | 30,874 | 30,735
Amortization expenses | 7,406 |  | 7,370 | 7,286
Operating expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Depreciation expenses | 2,150 |  | 2,082 | 2,051
Marketing expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 95 |  | 70 | 77
General and administrative expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | 63 |  | 68 | 71
Research and development expenses [Member] |  |  |  |
Disclosure Of Depreciation And Amortization [Line Items] |  |  |  |
Amortization expenses | $ 41 |  | $ 47 | $ 50

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