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Summary of Material Accounting Policy Information - Detail Information of Subsidiaries (Parenthetical) (Detail) | Dec. 31, 2024 | Dec. 31, 2023
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Chunghwa Sochamp Technology Inc. ("CHST") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 37.00% | 37.00%
Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 69.87% | 74.56%
Spring House Entertainment Tech. Inc. ("SHE") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 56.00% | 56.00%
CHT Security Co., Ltd. ("CHTSC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 63.45% | 69.28%
International Integrated Systems, Inc. ("IISI") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 49.64% | 51.00%
Chunghwa Digital Cultural and Creative Capital Co., Ltd (CDCC Capital) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 100.00% | 0.00%
Chunghwa Telecom Europe GmbH (CHTEU) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 100.00% | 0.00%
Unitronics Technology Corp. ("UTC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 100.00% |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHIEF Telecom Inc. ("CHIEF") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 58.57% | 58.63%
Chunghwa Investment Co., Ltd. ("CHI") [Member] | Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | Bottom of Range [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 50.00% |
Chunghwa Precision Test Tech. International Ltd. ("CHPT (International)") [Member] | Su Zhou Precision Test Tech. Ltd. ("SZPT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Percentage of Ownership interests | 100.00% | 100.00%

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