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Subsidiaries - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |
Revenue | $ 229,968 | $ 7,013 | $ 223,199 | $ 216,739
Net income | $ 38,508 | $ 1,174 | $ 38,061 | $ 37,869
International Integrated Systems, Inc. ("IISI") [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 49.64% | 49.64% | 51.00% |
Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 69.87% | 69.87% | 74.56% |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHIEF Telecom Inc. (CHIEF) [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 58.57% | 58.57% | 58.63% |

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