XML 179 R164.htm IDEA: XBRL DOCUMENT
v3.19.1

Revenue - Summary of Disaggregation of Revenue (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 TWD ($)
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | $ 214,461
Domestic Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 66,103
Mobile Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 100,877
Internet Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 29,650
International Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 13,424
Other [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 4,407
Mobile services [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 63,906
Mobile services [Member] | Mobile Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 63,906
Sales of product [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 41,289
Sales of product [Member] | Domestic Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 1,731
Sales of product [Member] | Mobile Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 35,702
Sales of product [Member] | Internet Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 4
Sales of product [Member] | International Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 251
Sales of product [Member] | Other [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 3,601
Local telephone and domestic long distance telephone services [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 29,996
Local telephone and domestic long distance telephone services [Member] | Domestic Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 29,996
Broadband access and domestic leased line services [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 22,453
Broadband access and domestic leased line services [Member] | Domestic Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 22,453
Data communications internet services [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 21,137
Data communications internet services [Member] | Internet Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 21,137
International network and leased telephone services [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 8,724
International network and leased telephone services [Member] | International Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 8,724
Others [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 26,956
Others [Member] | Domestic Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 11,923
Others [Member] | Mobile Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 1,269
Others [Member] | Internet Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 8,509
Others [Member] | International Fixed Communications Business [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | 4,449
Others [Member] | Other [Member] |
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items] |
Revenue from contracts with customers | $ 806

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_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_113_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_114&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentsAxis=cht_DomesticFixedCommunicationsBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cht_MobileCommunicationsBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cht_InternetBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cht_InternationalFixedCommunicationsBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=ifrs-full_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_MobileServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_SalesOfProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_LocalTelephoneAndDomesticLongDistanceTelephoneServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_BroadbandAccessAndDomesticLeasedLineServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_DataCommunicationsInternetServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_InternationalNetworkAndLeasedTelephoneServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_OtherProductsAndServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |