XML 246 R230.htm IDEA: XBRL DOCUMENT
v3.21.1

Related Parties Transactions - Summary of Related Parties (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020
Taiwan International Standard Electronics Co., Ltd. ("TISE") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
So-net Entertainment Taiwan Limited ("So-net") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
KKBOX Taiwan Co., Ltd. ("KKBOXTW") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
KingwayTek Technology Co., Ltd. ("KWT") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
UUPON Inc. ("UUPON") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Taiwan International Ports Logistics Corporation ("TIPL") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
International Integrated Systems, Inc. ("IISI") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Subsidiary
EnRack Tech. Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Subsidiary of the Company’s associate, Senao Networks, Inc.
Senao Networks, Inc. ("SNI") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Emplus Technologies, Inc. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Subsidiary of the Company’s associate, Senao Networks, Inc.
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Viettel-CHT Co., Ltd. ("Viettel-CHT") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Click Force Co., Ltd. ("CF") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Alliance Digital Tech Co., Ltd. ("ADT") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Cornerstone Ventures Co., Ltd. ("CVC") [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Next Commercial Bank Co., Ltd. (“NCB”) [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Associate
Chunghwa SEA Holdings (“CHT SEA”) [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Joint venture
Chunghwa Telecom Foundation [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | A nonprofit organization of which the funds donated by Chunghwa exceeds one third of its total funds
Senao Technical and Cultural Foundation [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | A nonprofit organization of which the funds donated by SENAO exceeds one third of its total funds
Sochamp Technology Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Investor of significant influence over CHST
E-Life Mall Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | One of the directors of E-Life Mall and a director of SENAO are members of an immediate family
Engenius Technologies Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of Engenius Technologies Co., Ltd. is a member of SENAO’s management
Cheng Keng Investment Co., Ltd. [member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of Cheng Keng Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Cheng Feng Investment Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of Cheng Feng Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
All Oriented Investment Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of All Oriented Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Hwa Shun Investment Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of Hwa Shun Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
Yu Yu Investment Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Chairman of Yu Yu Investment Co., Ltd. and SENAO’s chief executive officer are members of an immediate family
United Daily News Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Investor of significant influence over SFD
Shenzhen Century Communication Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Investor of significant influence over SCT
Chunghwa Post Co., Ltd. [Member] |
Disclosure of transactions between related parties [Line Items] |
Relationship | Government-related entity as Chunghwa Telecom

X
- Definition The description of the nature of the related party relationships. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DescriptionOfNatureOfRelatedPartyRelationship
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cht_TaiwanInternationalStandardElectronicsCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_SonetEntertainmentTaiwanLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_KKBOXTaiwanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_KingwayTekTechnologyCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_UUPONIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_TaiwanInternationalPortsLogisticsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_InternationalIntegratedSystemsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_EnRackTechCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_SenaoNetworksIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_EmplusTechnologiesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ST2SatelliteVenturesPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ViettelCHTCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChunghwaPChomeFundICoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ClickForceCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_AllianceDigitalTechCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_CornerstoneVenturesCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_NextCommercialBankCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChunghwaSEAHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChunghwaTelecomFoundationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_SenaoTechnicalAndCulturalFoundationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_SochampTechnologyCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ELifeMallCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_EngeniusTechnologiesCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChengKengInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChengFengInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_AllOrientedInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_HwaShunInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_YuYuInvestmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_UnitedDailyNewsCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ShenzhenCenturyCommunicationCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cht_ChunghwaPostCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |