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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2018 |  |  | 2019 |  |  | 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 |  |  |  | 57 |  |  | 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 |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2018 |  |  | 2019 |  |  | 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 |  |  |
Senao International Co., Ltd. |  | Senao International (Samoa) Holding Ltd. (“SIS”) |  | International investment |  |  | 100 |  |  |  | 100 |  |  |
|  | Youth Co., Ltd. (“Youth”) |  | Sale of information and communication technologies products |  |  | 93 |  |  |  | 93 |  |  | e)
|  | 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. (“Aval”) |  | Wiin Technology Co., Ltd. (“Wiin”) |  | Sale of information and communication technologies products |  |  | — |  |  |  | 100 |  |  | f)
Senyoung Insurance Agent Co., Ltd. |  | Senaolife Insurance Agent Co., Ltd. (“Senaolife”) |  | Life insurance services |  |  | — |  |  |  | 100 |  |  | g)
Light Era Development Co., Ltd. |  | Taoyuan Asia Silicon Valley Innovation Co., Ltd. (“TASVI”) |  | Development of real estate |  |  | 60 |  |  |  | — |  |  | 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 |  |  |
Chunghwa System Integration Co., Ltd. |  | Concord Technology Co., Ltd. (“Concord”) |  | Investment |  |  | — |  |  |  | — |  |  | 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 |  |  |
Senao International (Samoa) Holding Ltd. |  | Senao International HK Limited (“SIHK”) |  | International investment |  |  | 100 |  |  |  | 100 |  |  |
(Continued)
|  |  |  |  |  | Percentage of Ownership |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2018 |  |  | 2019 |  |  | Note
Senao International HK Limited |  | Senao Trading (Fujian) Co., Ltd. (“STF”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | — |  |  | k)
|  | Senao International Trading (Shanghai) Co., Ltd. (“SITS”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  |
|  | Senao International Trading (Shanghai) Co., Ltd. (“SEITS”) |  | Maintenance of information and communication technologies products |  |  | — |  |  |  | — |  |  | l)
|  | Senao International Trading (Jiangsu) Co., Ltd. (“SITJ”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | — |  |  | m)
Prime Asia Investments Group Ltd. (B.V.I.) |  | Chunghwa Hsingta Co., Ltd. (“CHC”) |  | Investment |  |  | 100 |  |  |  | 100 |  |  |
Chunghwa Hsingta Co., Ltd. (“CHC”) |  | Chunghwa Telecom (China) Co., Ltd. (“CTC”) |  | Integrated information and communication solution services for enterprise clients, and intelligent energy network service |  |  | 100 |  |  |  | 100 |  |  |
|  | Jiangsu Zhenhua Information Technology Company, LLC. (“JZIT”) |  | Providing intelligent energy saving solution and intelligent buildings services |  |  | — |  |  |  | — |  |  | 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 |  |  | o)
(Concluded)
| a) | SENAO transferred its treasury stock to employees in June 2018 and the Company’s ownership interest in SENAO decreased to 28.18% as of December 31, 2018 and 2019. As Chunghwa continues to control over half of the seats of the Board of Directors of SENAO (six out of eleven seats as of December 31, 2019) through the support of large beneficial stockholders, the accounts of SENAO are included in the consolidated financial statements.
| b) | CHIEF issued new shares in March and November 2018, and March and November 2019, as its employees exercised their options. In addition, Chunghwa and CHI disposed some shares of CHIEF in May 2018 before CHIEF traded its shares on the General Stock Market of the Taipei Exchange according to the local requirements. Furthermore, Chunghwa and CHI did not participate in the capital increase of CHIEF in June 2018. Therefore, the Company’s ownership interest in CHIEF decreased to 60.23% and 59.75% as of December 31, 2018 and 2019, 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) | SENAO subscribed for all the shares in the capital increase of Youth in December 2018. Therefore, the Company’s ownership interest in Youth increased from 89% to 93%.
| f) | Aval invested 100% equity shares of Wiin Technology Co., Ltd. (“Wiin”) in September 2019.
| g) | SENYOUNG invested 100% equity shares of Senaolife Insurance Agent Co., Ltd. (“Senaolife”) in November 2019.
| h) | LED invested 60% equity shares of Taoyuan Asia Silicon Valley Innovation Co., Ltd. (“TASVI”) in March 2018. TASVI completed its liquidation in September 2019.
| i) | Concord completed its liquidation in January 2018.
| j) | CHI disposed some shares of CHPT from April to August 2018. Therefore, its ownership interest in CHPT decreased to 34.25% as of December 31, 2018 and 2019. However, considering the absolute and relative size of ownership interest, and the dispersion of shares owned by the other stockholders, the management 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) | STF completed its liquidation in May 2019.
| l) | SEITS completed its liquidation in March 2018.
| m) | SITJ completed its liquidation in March 2019.
| n) | JZIT completed its liquidation in December 2018.
| o) | CHPT (International) invested 100% equity shares of Su Zhou Precision Test Tech. Ltd. (“SZPT”) in October 2019.

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