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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |  | 2016 |  |  | 2017 |  |  | Note
Chunghwa Telecom Co., Ltd. |  | Senao International Co., Ltd. (“SENAO”) |  | Handset and peripherals retailer; sales of CHT mobile phone plans as an agent |  |  | 29 |  |  |  | 29 |  |  | 1)
|  | 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 |  |  | 69 |  |  |  | 67 |  |  | 2)
|  | CHYP Multimedia Marketing & Communications Co., Ltd. (“CHYP”) |  | Digital information supply services and advertisement services |  |  | 100 |  |  |  | 100 |  |  | 3)
|  | Prime Asia Investments Group Ltd. (B.V.I.) (“Prime Asia”) |  | Investment |  |  | 100 |  |  |  | 100 |  |  |
|  | Spring House Entertainment Tech. Inc. (“SHE”) |  | Digital entertainment contents production, animated character licensing and endorsement, and mobile digital platform construction |  |  | 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 |  |  | 51 |  |  |  | 51 |  |  |
|  | Honghwa International Co., Ltd. (“HHI”) |  | Telecommunication engineering, sales agent of mobile phone plan application and other business services |  |  | 100 |  |  |  | 100 |  |  |
|  | Chunghwa Leading Photonics Tech Co., Ltd. (“CLPT”) |  | Production and sale of electronic components and finished products |  |  | 75 |  |  |  | 75 |  |  | 4)
|  | Chunghwa Telecom (Thailand) Co., Ltd. (“CHTT”) |  | International private leased circuit, IP VPN service, ICT and cloud VAS services |  |  | — |  |  |  | 100 |  |  | 5)
(Continued)
|  |  |  |  |  | Percentage of Ownership |  |  |
|  |  |  |  |  | December 31 |  |  |
Name of Investor |  | Name of Investee |  | Main Businesses and Products |  | 2016 |  |  | 2017 |  |  | 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 |  |  | 6)
|  | New Prospect Investments Holdings Ltd. (B.V.I.) (“New Prospect”) |  | Investment |  |  | 100 |  |  |  | — |  |  | 7)
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 |  |  | 89 |  |  |  | 89 |  |  |
|  | 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 |  |  | 8)
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 |  |  |
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 |  |  | 100 |  |  |  | 100 |  |  | 9)
Spring House Entertainment Tech. Inc. |  | Ceylon Innovation Co., Ltd. (“CEI”) |  | E-book publishing and copyright negotiation of digital music |  |  | — |  |  |  | — |  |  | 10)
Chunghwa Investment Co., Ltd. |  | Chunghwa Precision Test Tech. Co., Ltd. (“CHPT”) |  | Production and sale of semiconductor testing components and printed circuit board |  |  | 41 |  |  |  | 38 |  |  | 11)
|  | Chunghwa Investment Holding Co., Ltd. (“CIHC”) |  | Investment |  |  | — |  |  |  | — |  |  | 12)
Concord Technology Co., Ltd. |  | Glory Network System Service (Shanghai) Co., Ltd. (“GNSS (Shanghai)”) |  | Design, development and production of computer and internet software, installment, maintenance and consulting services of information system integration, and sales of self-production products |  |  | 100 |  |  |  | — |  |  | 13)
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 |  | 2016 |  |  | 2017 |  |  | Note
Chunghwa Investment Holding Co., Ltd. |  | CHI One Investment Co., Limited (“COI”) |  | Investment |  |  | — |  |  |  | — |  |  | 14)
Senao International HK Limited |  | Senao Trading (Fujian) Co., Ltd. (“STF”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  |
|  | 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 |  |  | 100 |  |  |  | 100 |  |  | 15)
|  | Senao International Trading (Jiangsu) Co., Ltd. (“SITJ”) |  | Sale of information and communication technologies products |  |  | 100 |  |  |  | 100 |  |  | 17)
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 |  |  | 75 |  |  |  | 75 |  |  | 16)
Chunghwa Precision Test Tech. International, Ltd. |  | Shanghai Taihua Electronic Technology Limited (“STET”) |  | Design of printed circuit board and related consultation service |  |  | 100 |  |  |  | 100 |  |  |
(Concluded)
| 1) | The Company owns 28.93% equity shares of SENAO. Chunghwa had originally four out of seven seats of the Board of Directors of SENAO through the support of large beneficial stockholders. In order to comply with the local regulations, SENAO increased two seats of independent directors in June 2016; therefore, total seats of its Board of Directors increased to nine and Chunghwa continues to hold four out of nine seats of the Board of Directors. As Chunghwa remains the control over SENAO’s relevant activities, the accounts of SENAO are included in the consolidated financial statements.
| 2) | Chunghwa and CHI disposed some shares of CHIEF in June 2017 before CHIEF traded its shares on the emerging stock market according to the local requirements. The Company’s equity ownership of CHIEF decreased to 70.43% as of December 31, 2017. CHIEF issued new shares in March 2018 as its employees exercised their options. The Company’s equity ownership decreased to 69.31% on March 31, 2018.
| 3) | Chunghwa International Yellow Pages Co., Ltd changed its name to CHYP Multimedia Marketing & Communications Co., Ltd starting from September 4, 2017.
| 4) | Chunghwa invested 75% equity shares of Chunghwa Leading Photonics Tech Co., Ltd. (“CLPT”) in July 2016.
| 5) | Chunghwa invested 100% equity shares of Chunghwa Telecom (Thailand) Co., Ltd. (“CHTT”) in March 2017.
| 6) | Chunghwa invested 80% equity shares of CHT Security Co., Ltd. (“CHTSC”) in December 2017.
| 7) | New Prospect was approved to dissolve its business in April 2017. The liquidation of New Prospect was completed in May 2017.
| 8) | SENAO invested 100% equity shares of SENYOUNG Insurance Agent Co., Ltd. (“SENYOUNG”) in November 2017.
| 9) | Concord was approved to end and dissolve its business in August 2017. The liquidation of Concord was completed in January 2018.
| 10) | CEI’s liquidation was completed in August 2016 and SHE received the proceeds from the liquidation.
| 11) | CHI disposed of some shares of CHPT in March 2016. Furthermore, CHI did not participate in the capital increase of CHPT in March 2016 and September 2017. Therefore, its ownership interest in CHPT decreased to 38.30%. However, considering 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.
| 1 2) | CIHC’s dissolution was approved in August 2016 and the liquidation was completed in September 2016. CHI received the proceeds from the liquidation.
| 1 3) | GNSS (Shanghai) completed its liquidation in August 2017 and Concord received the proceeds from the liquidation.
| 1 4) | COI completed its liquidation in July 2016 and CIHC received the proceeds from the liquidation.
| 1 5) | SEITS was approved to end and dissolve its business in March 2017. The liquidation of SEITS was completed in March 2018.
| 1 6) | JZIT was approved to end and dissolve its business in May 2016. The liquidation of JZIT is still in process.
| 1 7) | SITJ was approved to end and dissolve its business in April 2018. The liquidation of SITJ is still in process.
| 1 8) | LED invested 60% equity shares of Taoyuan Asia Silicon Valley Innovation Co., Ltd. (“TASVI”) in March 2018.

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