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Summary of Material Accounting Policy Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Disclosure of subsidiaries [abstract] |
Detail Information of Subsidiaries |
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2022 |  |  | 2023 |  |  | Note
Chunghwa Telecom Co., Ltd. |  | Senao International Co., Ltd. (“SENAO”) |  | Handset and peripherals retailer, sales of CHT mobile phone plans as an agent |  |  | 28 |  |  |  | 28 |  |  | a)
|  | Light Era Development Co., Ltd. (“LED”) |  | Planning and development of real estate and intelligent buildings, and property management |  |  | 100 |  |  |  | 100 |  |  |
|  | Donghwa Telecom Co., Ltd. (“DHT”) |  | International private leased circuit, IP VPN service, and IP transit services |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Telecom Singapore Pte., Ltd. (“CHTS”) |  | International private leased circuit, IP VPN service, and IP transit services |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa System Integration Co., Ltd. (“CHSI”) |  | Providing system integration services and telecommunications equipment |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Investment Co., Ltd. (“CHI”) |  | Investment |  |  | 89 |  |  |  | 89 |  |  |
|  | CHIEF Telecom Inc. (“CHIEF”) |  | Network integration, internet data center (“IDC”), communications integration and cloud application services |  |  | 56 |  |  |  | 56 |  |  | b)
|  | CHYP Multimedia Marketing & Communications Co., Ltd. (“CHYP”) |  | Digital information supply services and advertisement services |  |  | 100 |  |  |  | 100 |  |  |
|  | Prime Asia Investments Group Ltd. (“Prime Asia”) |  | Investment |  |  | 100 |  |  |  | 100 |  |  |
|  | Spring House Entertainment Tech. Inc. (“SHE”) |  | Software design services, internet contents production and play, and motion picture production and distribution |  |  | 56 |  |  |  | 56 |  |  |
|  | Chunghwa Telecom Global, Inc. (“CHTG”) |  | International private leased circuit, internet services, and transit services |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Telecom Vietnam Co., Ltd. (“CHTV”) |  | Intelligent energy saving solutions, international circuit, and information and communication technology (“ICT”) services |  |  | 100 |  |  |  | 100 |  |  |
|  | Smartfun Digital Co., Ltd. (“SFD”) |  | Providing diversified family education digital services |  |  | 65 |  |  |  | 65 |  |  |
|  | Chunghwa Telecom Japan Co., Ltd. (“CHTJ”) |  | International private leased circuit, IP VPN service, and IP transit services |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Sochamp Technology Inc. (“CHST”) |  | Design, development and production of Automatic License Plate Recognition software and hardware |  |  | 37 |  |  |  | 37 |  |  | c)
|  | Honghwa International Co., Ltd. (“HHI”) |  | Telecommunications engineering, sales agent of mobile phone plan application and other business services, etc. |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Leading Photonics Tech Co., Ltd. (“CLPT”) |  | Production and sale of electronic components and finished products |  |  | 75 |  |  |  | 75 |  |  | d)
|  | Chunghwa Telecom (Thailand) Co., Ltd. (“CHTT”) |  | International private leased circuit, IP VPN service, ICT and cloud VAS services |  |  | 100 |  |  |  | 100 |  |  |
(Continued)
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2022 |  |  | 2023 |  |  | Note
|  | CHT Security Co., Ltd. (“CHTSC”) |  | 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 |  |  | 73 |  |  |  | 69 |  |  | e)
|  | International Integrated Systems, Inc. (“IISI”) |  | IT solution provider, IT application consultation, system integration and package solution |  |  | 51 |  |  |  | 51 |  |  |
Senao International Co., Ltd. |  | Senao International (Samoa) Holding Ltd. (“SIS”) |  | International investment |  |  | 100 |  |  |  | — |  |  | f)
|  | Youth Co., Ltd. (“Youth”) |  | Sale of information and communication technologies products |  |  | 96 |  |  |  | 96 |  |  |
|  | Aval Technologies Co., Ltd. (“Aval”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  |
|  | Senyoung Insurance Agent Co., Ltd. (“SENYOUNG”) |  | Property and liability insurance agency |  |  | 100 |  |  |  | 100 |  |  |
Youth Co., Ltd. |  | ISPOT Co., Ltd. (“ISPOT”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  |
|  | Youyi Co., Ltd. (“Youyi”) |  | Maintenance of information and communication technologies products |  |  | 100 |  |  |  | — |  |  | g)
Aval Technologies Co., Ltd. |  | Wiin Technology Co., Ltd. (“Wiin”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  |
Senyoung Insurance Agent Co., Ltd. |  | Senaolife Insurance Agent Co., Ltd. (“Senaolife”) |  | Life insurance services |  |  | 100 |  |  |  | — |  |  | h)
CHIEF Telecom Inc. |  | Unigate Telecom Inc. (“Unigate”) |  | Telecommunications and internet service |  |  | 100 |  |  |  | 100 |  |  |
|  | Chief International Corp. (“CIC”) |  | Telecommunications and internet service |  |  | 100 |  |  |  | 100 |  |  |
|  | Shanghai Chief Telecom Co., Ltd. (“SCT”) |  | Telecommunications and internet service |  |  | 49 |  |  |  | 49 |  |  | i)
Chunghwa Investment Co., Ltd. |  | Chunghwa Precision Test Tech. Co., Ltd. (“CHPT”) |  | Production and sale of semiconductor testing components and printed circuit board |  |  | 34 |  |  |  | 34 |  |  | j)
Chunghwa Precision Test Tech. Co., Ltd. |  | Chunghwa Precision Test Tech. USA Corporation (“CHPT (US)”) |  | Design and after-sale services of semiconductor testing components and printed circuit board |  |  | 100 |  |  |  | 100 |  |  |
|  | CHPT Japan Co., Ltd. (“CHPT (JP)”) |  | Related services of electronic parts, machinery processed products and printed circuit board |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Precision Test Tech. International, Ltd. (“CHPT (International)”) |  | Wholesale and retail of electronic materials, and investment |  |  | 100 |  |  |  | 100 |  |  |
|  | TestPro Investment Co., Ltd. (“TestPro”) |  | Investment |  |  | 100 |  |  |  | 100 |  |  | k)
(Continued)
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2022 |  |  | 2023 |  |  | Note
TestPro Investment Co., Ltd. |  | NavCore Tech. Co., Ltd. (“NavCore”) |  | Sale and manufacturing of smart equipment, smart factory software and hardware integration and technical consulting service |  |  | 54 |  |  |  | 54 |  |  | l)
Senao International (Samoa) Holding Ltd. |  | Senao International HK Limited (“SIHK”) |  | International investment |  |  | 100 |  |  |  | — |  |  | m)
Prime Asia Investments Group Ltd. |  | Chunghwa Hsingta Co., Ltd. (“CHC”) |  | Investment |  |  | 100 |  |  |  | 100 |  |  |
Chunghwa Hsingta Co., Ltd. |  | Chunghwa Telecom (China) Co., Ltd. (“CTC”) |  | Integrated information and communication solution services for enterprise clients, and intelligent energy network service |  |  | — |  |  |  | — |  |  | n)
Chunghwa Precision Test Tech. International, Ltd. |  | Shanghai Taihua Electronic Technology Limited (“STET”) |  | Design of printed circuit board and related consultation service |  |  | 100 |  |  |  | 100 |  |  |
|  | Su Zhou Precision Test Tech. Ltd. (“SZPT”) |  | Assembly processed of circuit board, design of printed circuit board and related consultation service |  |  | 100 |  |  |  | 100 |  |  |
International Integrated Systems, Inc. |  | Infoexplorer International Co., Ltd.(“IESA”) |  | Investment |  |  | 100 |  |  |  | — |  |  | o)
|  | IISI Investment Co., Ltd. (“IICL”) |  | Investment |  |  | — |  |  |  | — |  |  | p)
|  | Unitronics Technology Corp. (“UTC”) |  | Development and maintenance of information system |  |  | 99.96 |  |  |  | 100 |  |  | q)
Infoexplorer International Co., Ltd. |  | International Integrated Systems (Hong Kong) Limited (“IEHK”) |  | Investment and technical consulting service |  |  | 100 |  |  |  | — |  |  | r)
IISI Investment Co., Ltd. |  | Leading Tech Co., Ltd. (“LTCL”) |  | Investment |  |  | — |  |  |  | — |  |  | p)
Leading Tech Co., Ltd. |  | Leading Systems Co., Ltd. (“LSCL”) |  | Investment |  |  | — |  |  |  | — |  |  | p)
(Concluded) a) Chunghwa continues to control seven out of thirteen seats of the Board of Directors of SENAO through the support of large beneficial stockholders. As a result, the Company treated SENAO as a subsidiary. b) CHIEF issued new shares in March 2022, December 2022 and December 2023 as its employees exercised options. Therefore, the Company’s ownership interest in CHIEF decreased to 58.67% and 58.63% as of December 31, 2022 and 2023, respectively. c) Chunghwa did not participate in the capital increase of CHST in November 2022. Therefore, the Company’s ownership interest in CHST decreased to 37.09% as of December 31, 2023. However, Chunghwa continues to control three out of five seats of the Board of Directors of CHST. As a result, the Company treated CHST as a subsidiary. d) CLPT issued new shares in May 2023 as its employees exercised options. Therefore, the Company’s ownership interest in CLPT decreased to 74.56% as of December 31, 2023. e) CHTSC issued new shares in February 2022, May 2022, February 2023 and May 2023 as its employees exercised options. Therefore, the Company’s ownership interest in CHTSC decreased to 73.09% and 69.28% as of December 31, 2022 and 2023, respectively. f) SIS reduced 96.26% of its capital to offset accumulated deficits in November 2022. The Company’s ownership interest in SIS remained the same. SIS completed its liquidation in September 2023. g) Youyi completed its liquidation in November 2023. h) In order to coordinate with financial planning and adjustment of organizational resources, the Board of Directors of SENYOUNG approved the merger with Senaolife. SENYOUNG was the surviving company. The merger was completed on May 1, 2023. i) CHIEF has two out of three seats of the Board of Directors of SCT according to the mutual agreements among stockholders and gained control over SCT; hence, SCT is deemed as a subsidiary of the Company. j) Though the Company’s ownership interest in CHPT is less than 50%, the management considered the absolute and relative size of ownership interest, and the dispersion of shares owned by the other stockholders and concluded that the Company has a sufficiently dominant voting interest to direct the relevant activities; hence, CHPT is deemed as a subsidiary of the Company. k) CHPT invested and established TestPro in March 2022. CHPT obtained 100% ownership interest of TestPro. l) TestPro invested and established NavCore in May 2022. TestPro obtained 54.25% ownership interest of NavCore. m) SIHK completed its liquidation in July 2023. n) CTC completed its liquidation in October 2022. o) IESA completed its liquidation in September 2023. p) IICL, LTCL and LSCL completed liquidation in September 2022. q) IISI purchased shares of UTC in August 2023. Therefore, the Company’s ownership interest in UTC increased to 100% as of December 31, 2023. r) IEHK completed its liquidation in June 2023.

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