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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Significant Investments In Subsidiaries [Abstract] |
Detail Information of Subsidiaries | The detail information of the subsidiaries at the end of reporting period was as follows:
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2019 |  |  | 2020 |  |  | 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 |  |  | 57 |  |  |  | 56 |  |  | b)
|  | CHYP Multimedia Marketing & Communications Co., Ltd. (“CHYP”) |  | Digital information supply services and advertisement services |  |  | 100 |  |  |  | 100 |  |  |
|  | Prime Asia Investments Group Ltd. (B.V.I.) (“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 |  |  | c)
|  | 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 |  |  | 51 |  |  |  | 51 |  |  |
|  | 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 |  |  |
|  | Chunghwa Telecom (Thailand) Co., Ltd. (“CHTT”) |  | International private leased circuit, IP VPN service, ICT and cloud VAS services |  |  | 100 |  |  |  | 100 |  |  | d)
(Continued)
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2019 |  |  | 2020 |  |  | 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 identify services |  |  | 80 |  |  |  | 80 |  |  |
|  | International Integrated Systems, Inc. (“IISI”) |  | IT solution provider, IT application consultation, system integration and package solution |  |  | — |  |  |  | 51 |  |  | e)
Senao International Co., Ltd. |  | Senao International (Samoa) Holding Ltd. (“SIS”) |  | International investment |  |  | 100 |  |  |  | 100 |  |  | f)
|  | Youth Co., Ltd. (“Youth”) |  | Sale of information and communication technologies products |  |  | 93 |  |  |  | 96 |  |  | g)
|  | 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 |  |  |  | 100 |  |  |
Aval Technologies Co., Ltd. |  | Wiin Technology Co., Ltd. (“Wiin”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  | h)
Senyoung Insurance Agent Co., Ltd. |  | Senaolife Insurance Agent Co., Ltd. (“Senaolife”) |  | Life insurance services |  |  | 100 |  |  |  | 100 |  |  | i)
Light Era Development Co., Ltd. |  | Taoyuan Asia Silicon Valley Innovation Co., Ltd. (“TASVI”) |  | Development of real estate |  |  | — |  |  |  | — |  |  | j)
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 |  |  | k)
Chunghwa Investment Co., Ltd. |  | Chunghwa Precision Test Tech. Co., Ltd. (“CHPT”) |  | Production and sale of semiconductor testing components and printed circuit board |  |  | 34 |  |  |  | 34 |  |  | l)
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 |  |  |
Senao International (Samoa) Holding Ltd. |  | Senao International HK Limited (“SIHK”) |  | International investment |  |  | 100 |  |  |  | 100 |  |  | m)
(Continued)
|  |  |  |  |  | Percentage of Ownership interests |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2019 |  |  | 2020 |  |  | Note
Senao International HK Limited |  | Senao Trading (Fujian) Co., Ltd. (“STF”) |  | Sale of information and communication technologies products |  |  | — |  |  |  | — |  |  | n)
|  | Senao International Trading (Shanghai) Co., Ltd. (“SITS”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  | o)
|  | Senao International Trading (Jiangsu) Co., Ltd. (“SITJ”) |  | Sale of information and communication technologies products |  |  | — |  |  |  | — |  |  | p)
Prime Asia Investments Group Ltd. (B.V.I.) |  | 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 |  |  | 100 |  |  |  | 100 |  |  | q)
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 |  |  | r)
International Integrated Systems, Inc. |  | Infoexplorer International Co., Ltd.(“IESA”) |  | Investment |  |  | — |  |  |  | 100 |  |  | s)
|  | IISI Investment Co., Ltd. (“IICL”) |  | Investment |  |  | — |  |  |  | 100 |  |  | s)
|  | Unitronics Technology Corp. (“UTC”) |  | Development and maintenance of information system |  |  | — |  |  | 99.96 |  |  | s)
Infoexplorer International Co., Ltd. |  | International Integrated Systems (Hong Kong) Limited (“IEHK”) |  | Investment and technical consulting service |  |  | — |  |  |  | 100 |  |  | s)
IISI Investment Co., Ltd. |  | Leading Tech Co., Ltd. (“LTCL”) |  | Investment |  |  | — |  |  |  | 100 |  |  | s)
Leading Tech Co., Ltd. |  | Leading Systems Co., Ltd. (“LSCL”) |  | Investment |  |  | — |  |  |  | 100 |  |  | s)
Leading Systems Co., Ltd. |  | International Integrated Systems Inc. (Shanghai) (“IISS”) |  | Development and maintenance of information system |  |  | — |  |  |  | 100 |  |  | s)
International Integrated Systems Inc. (Shanghai) |  | Huiyu Shanghai Management Consultancy Co., Ltd. (“HSMC”) |  | Development and maintenance of information system |  |  | — |  |  |  | — |  |  | s) t)
(Concluded)
| a) | Chunghwa continues to control six out of eleven 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 2019, November 2019, March 2020 and December 2020 as its employees exercised options. Therefore, the Company’s ownership interest in CHIEF decreased to 59.75% and 59.08% as of December 31, 2019 and 2020, respectively.
| c) | SHE reduced 19.72% of its capital to offset accumulated deficits in December 2019 and the Company’s ownership interest in SHE remained the same.
| d) | The Company increased its investment in CHTT proportionally in October 2019 and the Company’s ownership interest in CHTT remained the same.
| e) | Chunghwa obtained 20.38% ownership interest in IISI in July 2020 and Chunghwa’s ownership interest in IISI increased to 51.54% by considering the previously held ownership interest in IISI. Chunghwa obtained over half of the seats of the Board of Directors of IISI; therefore, Chunghwa gained control over IISI and treated it as a subsidiary. IISI issued new shares in September 2020 as its employees exercised options; therefore, the Company’s ownership interest in IISI decreased to 51.20% as of December 31, 2020.
| f) | SIS reduced and returned its capital to its stakeholders in November 2020. The Company’s ownership interest in SIS remained the same.
| g) | SENAO subscribed for all the shares in the capital increase of Youth in April 2020. Therefore, the Company’s ownership interest in Youth increased from 92.89% to 95.79%.
| h) | Aval invested 100% equity shares of Wiin Technology Co., Ltd. (“Wiin”) in September 2019.
| i) | SENYOUNG invested 100% equity shares of Senaolife Insurance Agent Co., Ltd. (“Senaolife”) in November 2019.
| j) | TASVI completed its liquidation in September 2019.
| k) | 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.
| l) | 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.
| m) | SIHK reduced and returned its capital to its stakeholders in November 2020. The Company’s ownership interest in SIHK remained the same.
| n) | STF completed its liquidation in May 2019.
| o) | SITS was approved to end and dissolve its business in December 2020. The liquidation of SITS is still in process.
| p) | SITJ completed its liquidation in March 2019.
| q) | CTC was approved to end and dissolve its business in August 2020. The liquidation of CTC is still in process.
| r) | CHPT (International) invested 100% equity shares of Su Zhou Precision Test Tech. Ltd. (“SZPT”) in October 2019.
| s) | It is a subsidiary of IISI.
| t) | HSMC completed its liquidation in December 2020.

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