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Summary of Material Accounting Policy Information - Detail Information of Subsidiaries (Parenthetical) (Detail) | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | May 31, 2022 | Mar. 31, 2022
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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 | 74.56% | 75.00% |  |  |
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 | 69.28% | 73.09% |  |  |
International Integrated Systems, Inc. ("IISI") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership interests | 51.00% | 51.00% |  |  |
Senao International (Samoa) Holding Ltd. ("SIS") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership |  |  | 96.26% |  |
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of additional ownership interest obtained |  |  |  |  | 100.00%
TestPro Investment Co., Ltd. ("TestPro") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of additional ownership interest obtained |  |  |  | 54.25% |
Unitronics Technology Corp. ("UTC") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership interests | 100.00% |  |  |  |
Chunghwa | Chunghwa Sochamp Technology Inc. ("CHST") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership interests | 37.09% |  |  |  |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHIEF Telecom Inc. ("CHIEF") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership interests | 58.63% | 58.67% |  |  |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Percentage of Ownership interests | 74.56% |  |  |  |
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% |  |  |

X
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