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Summary of Material Accounting Policy Information - Detail Information of Subsidiaries (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Light Era Development Co., Ltd. ("LED") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Planning and development of real estate and intelligent buildings, and property management |
Percentage of Ownership interests | 100.00% | 100.00%
Donghwa Telecom Co., Ltd. ("DHT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, IP VPN service, and IP transit services |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Telecom Singapore Pte., Ltd. ("CHTS") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, IP VPN service, and IP transit services |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa System Integration Co., Ltd. ("CHSI") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Providing system integration services and telecommunications equipment |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Investment Co Ltd CHI [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment |
Percentage of Ownership interests | 89.00% | 89.00%
CHYP Multimedia Marketing & Communications Co., Ltd. ("CHYP") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Digital information supply services and advertisement services |
Percentage of Ownership interests | 100.00% | 100.00%
Prime Asia Investments Group Ltd. (Prime Asia) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment |
Percentage of Ownership interests | 100.00% | 100.00%
Spring House Entertainment Tech. Inc. ("SHE") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Software design services, internet contents production and play, and motion picture production and distribution |
Percentage of Ownership interests | 56.00% | 56.00%
Chunghwa Telecom Global, Inc. ("CHTG") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, internet services, and transit services |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Telecom Vietnam Co., Ltd. ("CHTV") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Intelligent energy saving solutions, international circuit, and information and communication technology (“ICT”) services |
Percentage of Ownership interests | 100.00% | 100.00%
Smartfun Digital Co., Ltd. ("SFD") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Providing diversified family education digital services |
Percentage of Ownership interests | 65.00% | 65.00%
Chunghwa Telecom Japan Co., Ltd. ("CHTJ") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, IP VPN service, and IP transit services |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Sochamp Technology Inc. ("CHST") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Design, development and production of Automatic License Plate Recognition software and hardware |
Percentage of Ownership interests | 37.00% | 37.00%
Honghwa International Co., Ltd. ("HHI") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Telecommunications engineering, sales agent of mobile phone plan application and other business services, etc. |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Production and sale of electronic components and finished products |
Percentage of Ownership interests | 69.87% | 74.56%
Chunghwa Telecom (Thailand) Co., Ltd. ("CHTT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, IP VPN service, ICT and cloud VAS services |
Percentage of Ownership interests | 100.00% | 100.00%
CHT Security Co., Ltd. ("CHTSC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Computing equipment installation, wholesale of computing and business machinery equipment and software, management consulting services, data processing services, digital information supply services and internet identity services |
Percentage of Ownership interests | 63.45% | 69.28%
International Integrated Systems, Inc. ("IISI") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | IT solution provider, IT application consultation, system integration and package solution |
Percentage of Ownership interests | 49.64% | 51.00%
Chunghwa Digital Cultural and Creative Capital Co., Ltd (CDCC Capital) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment and management consulting |
Percentage of Ownership interests | 100.00% | 0.00%
Chunghwa Telecom Europe GmbH (CHTEU) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International private leased circuit, internet services, transit services and ICT services |
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. ("Chunghwa") [Member] | Senao [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Handset and peripherals retailer, sales of CHT mobile phone plans as an agent |
Percentage of Ownership interests | 28.00% | 28.00%
Chunghwa Telecom Co., Ltd. ("Chunghwa") [Member] | CHIEF [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Network integration, internet data center (“IDC”), communications integration and cloud application services |
Percentage of Ownership interests | 56.00% | 56.00%
Senao International Co., Ltd. ("SENAO") [Member] | Senao International (Samoa) Holding Ltd. ("SIS") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International investment |
Percentage of Ownership interests | 0.00% | 0.00%
Senao International Co., Ltd. ("SENAO") [Member] | Senyoung Insurance Agent Co., Ltd. ("SENYOUNG") |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Property and liability insurance agency |
Percentage of Ownership interests | 100.00% | 100.00%
Senao International Co., Ltd. ("SENAO") [Member] | Youth Co., Ltd. ("Youth") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Sale of information and communication technologies products |
Percentage of Ownership interests | 96.00% | 96.00%
Senao International Co., Ltd. ("SENAO") [Member] | Aval Technologies Co., Ltd. (Aval) [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Sale of information and communication technologies products |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | CHPT Japan Co., Ltd. ("CHPT (JP)") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Related services of electronic parts, machinery processed products and printed circuit board |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | Chunghwa Precision Test Tech. International Ltd. ("CHPT (International)") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Wholesale and retail of electronic materials, and investment |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | TestPro Investment Co., Ltd. ("TestPro") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | Chunghwa Precision Test Tech. USA Corporation ("CHPT (US)") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Design and after-sale services of semiconductor testing components and printed circuit board |
Percentage of Ownership interests | 100.00% | 100.00%
Youth Co., Ltd. ("Youth") [Member] | ISPOT Co., Ltd. ("ISPOT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Sale of information and communication technologies products |
Percentage of Ownership interests | 100.00% | 100.00%
Youth Co., Ltd. ("Youth") [Member] | Youyi Co., Ltd. ("Youyi") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Maintenance of information and communication technologies products |
Percentage of Ownership interests | 0.00% | 0.00%
Aval Technologies Co., Ltd. ("Aval") [Member] | Wiin Technology Co., Ltd. ("Wiin") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Sale of information and communication technologies products |
Percentage of Ownership interests | 100.00% | 100.00%
SENYOUNG Insurance Agent Co., Ltd. ("SENYOUNG") [Member] | Senaolife Insurance Agent Co., Ltd. ("Senaolife") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Life insurance services |
Percentage of Ownership interests | 0.00% | 0.00%
CHIEF Telecom Inc. ("CHIEF") [Member] | Unigate Telecom Inc. ("Unigate") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Telecommunications and internet service |
Percentage of Ownership interests | 100.00% | 100.00%
CHIEF Telecom Inc. ("CHIEF") [Member] | Chief International Corp. ("CIC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Telecommunications and internet service |
Percentage of Ownership interests | 100.00% | 100.00%
CHIEF Telecom Inc. ("CHIEF") [Member] | Shanghai Chief Telecom Co., Ltd. ("SCT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Telecommunications and internet service |
Percentage of Ownership interests | 49.00% | 49.00%
Chunghwa Investment Co., Ltd. ("CHI") [Member] | Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Production and sale of semiconductor testing components and printed circuit board |
Percentage of Ownership interests | 34.00% | 34.00%
TestPro Investment Co., Ltd. ("TestPro") [Member] | NavCore Tech. Co., Ltd. ("NavCore") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Sale and manufacturing of smart equipment, smart factory software and hardware integration and technical consulting service |
Percentage of Ownership interests | 54.00% | 54.00%
Senao International (Samoa) Holding Ltd. ("SIS") [Member] | Senao International HK Limited ("SIHK") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | International investment |
Percentage of Ownership interests | 0.00% | 0.00%
Prime Asia Investments Group Ltd. (B.V.I.) ("Prime Asia") [Member] | Chunghwa Hsingta Co., Ltd. ("CHC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. International Ltd. ("CHPT (International)") [Member] | Su Zhou Precision Test Tech. Ltd. ("SZPT") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Assembly processed of circuit board, design of printed circuit board and related consultation service |
Percentage of Ownership interests | 100.00% | 100.00%
Chunghwa Precision Test Tech. International Ltd. ("CHPT (International)") [Member] | Shanghai Taihua Electronic Technology Limited ("STET") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Design of printed circuit board and related consultation service |
Percentage of Ownership interests | 100.00% | 100.00%
International Integrated Systems, Inc. ("IISI") [Member] | Unitronics Technology Corp. ("UTC") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Development and maintenance of information system |
Percentage of Ownership interests | 100.00% | 100.00%
International Integrated Systems, Inc. ("IISI") [Member] | Infoexplorer International Co., Ltd.("IESA") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment |
Percentage of Ownership interests | 0.00% | 0.00%
Infoexplorer International Co., Ltd.("IESA") [Member] | International Integrated Systems (Hong Kong) Limited ("IEHK") [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Main Businesses and Products | Investment and technical consulting service |
Percentage of Ownership interests | 0.00% | 0.00%

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