XML 136 R120.htm IDEA: XBRL DOCUMENT
v3.21.1

Investments Accounted for Using Equity Method - Investments in Associates (Detail) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 | Nov. 30, 2019 TWD ($) | Feb. 28, 2019
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 6,685,000,000 |  | $ 7,139,000,000 |  |  |  |  |
Investment in joint venture | 10,000,000 |  | 0 |  |  |  |  |
Investments accounted for using equity method | 6,695,000,000 |  | 7,139,000,000 |  | $ 238 |  |  |
The Company’s share of profits | 244,000,000 | $ 9 | 459,000,000 | $ 509,000,000 |  |  |  |
Next Commercial Bank Co., Ltd. (“NCB”) [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | 3,777,000,000 |  | 4,074,000,000 |  |  |  | $ 4,190,000,000 |
Investments accounted for using equity method | $ 3,777,000,000 |  | $ 4,074,000,000 |  |  |  |  |
Percentage of ownership in associates | 41.90% |  | 41.90% |  | 41.90% |  | 41.90% | 41.90%
Percentage of voting rights in associates | 42.00% |  | 42.00% |  | 42.00% |  |  |
Senao Networks, Inc. ("SNI") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 841,000,000 |  | $ 803,000,000 |  |  |  |  |
Percentage of ownership in associates | 34.00% |  | 34.00% |  | 34.00% |  |  |
Percentage of voting rights in associates | 34.00% |  | 34.00% |  | 34.00% |  |  |
Fair values based on the closing market prices | $ 1,708,000,000 |  | $ 2,014,000,000 |  |  |  |  |
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 488,000,000 |  | $ 501,000,000 |  |  |  |  |
Percentage of ownership in associates | 38.00% |  | 38.00% |  | 38.00% |  |  |
Percentage of voting rights in associates | 38.00% |  | 38.00% |  | 38.00% |  |  |
International Integrated Systems, Inc. ("IISI") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 0 |  | $ 335,000,000 |  |  |  |  |
Percentage of ownership in associates | 0.00% |  | 31.47% |  | 0.00% | 31.16% |  |
Percentage of voting rights in associates | 0.00% |  | 31.00% |  | 0.00% |  |  |
Viettel-CHT Co., Ltd. ("Viettel-CHT") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 363,000,000 |  | $ 317,000,000 |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Taiwan International Standard Electronics Co., Ltd. ("TISE") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 324,000,000 |  | $ 268,000,000 |  |  |  |  |
Percentage of ownership in associates | 40.00% |  | 40.00% |  | 40.00% |  |  |
Percentage of voting rights in associates | 40.00% |  | 40.00% |  | 40.00% |  |  |
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 193,000,000 |  | $ 194,000,000 |  |  |  |  |
Percentage of ownership in associates | 50.00% |  | 50.00% |  | 50.00% |  |  |
Percentage of voting rights in associates | 50.00% |  | 50.00% |  | 50.00% |  |  |
KingwayTek Technology Co., Ltd. ("KWT") - Listed [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 213,000,000 |  | $ 217,000,000 |  |  |  |  |
So-net Entertainment Taiwan Limited ("So-net") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 225,000,000 |  | $ 186,000,000 |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Taiwan International Ports Logistics Corporation ("TIPL") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 56,000,000 |  | $ 51,000,000 |  |  |  |  |
Percentage of ownership in associates | 27.00% |  | 27.00% |  | 27.00% |  |  |
Percentage of voting rights in associates | 27.00% |  | 27.00% |  | 27.00% |  |  |
Click Force Co., Ltd. ("CF") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 33,000,000 |  | $ 37,000,000 |  |  |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |
Percentage of voting rights in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |
KKBOX Taiwan Co., Ltd. ("KKBOXTW") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 163,000,000 |  | $ 151,000,000 |  |  |  |  |
Percentage of ownership in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Percentage of voting rights in associates | 30.00% |  | 30.00% |  | 30.00% |  |  |
Alliance Digital Tech Co., Ltd. ("ADT") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 3,000,000 |  | $ 3,000,000 |  |  |  |  |
Percentage of ownership in associates | 14.00% |  | 14.00% |  | 14.00% |  |  |
Percentage of voting rights in associates | 14.00% |  | 14.00% |  | 14.00% |  |  |
Cornerstone Ventures Co., Ltd. ("CVC") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 6,000,000 |  | $ 5,000,000 |  |  |  |  |
Percentage of ownership in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |
Percentage of voting rights in associates | 49.00% |  | 49.00% |  | 49.00% |  |  |
MeWorks LIMITED (HK) ("MeWorks") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 0 |  | $ 0 |  |  |  |  |
Percentage of ownership in associates | 0.00% |  | 20.00% |  | 0.00% |  |  |
Percentage of voting rights in associates | 0.00% |  | 20.00% |  | 0.00% |  |  |
UUPON Inc. ("UUPON") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Investments in associates | $ 0 |  |  |  |  |  |  |
Increase (decrease) in Investments in associates |  |  | $ (3,000,000) |  |  |  |  |
Percentage of ownership in associates | 0.00% |  | 22.00% |  | 0.00% |  |  |
Percentage of voting rights in associates | 0.00% |  | 22.00% |  | 0.00% |  |  |
KingwayTek Technology Co., Ltd. ("KWT") [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership in associates | 22.72% |  | 22.52% |  | 22.72% |  |  |
Percentage of voting rights in associates | 23.00% |  | 23.00% |  | 23.00% |  |  |
Fair values based on the closing market prices | $ 676,000,000 |  | $ 873,000,000 |  |  |  |  |
Associates [Member] |  |  |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |  |  |
The Company’s share of profits | 540,000,000 |  | 575,000,000 | 509,000,000 |  |  |  |
The Company’s share of other comprehensive income (loss) | (8,000,000) |  | (3,000,000) | 5,000,000 |  |  |  |
The Company’s share of total comprehensive income | $ 532,000,000 |  | $ 572,000,000 | $ 514,000,000 |  |  |  |

X
- Definition Increase decrease in investments in associates accounted for using equity method. + References No definition available. + Details
Name: | cht_IncreaseDecreaseInInvestmentsInAssociatesAccountedForUsingEquityMethod
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of ownership interest in associate. + References No definition available. + Details
Name: | cht_PercentageOfOwnershipInterestInAssociate
Namespace Prefix: | cht_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of voting power held in associate + References No definition available. + Details
Name: | cht_PercentageOfVotingPowerHeldInAssociate
Namespace Prefix: | cht_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_b_iii&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of investments in joint ventures accounted for using the equity method. [Refer: Joint ventures [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentsInJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_g&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity's share of the total comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Joint ventures [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShareOfTotalComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

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

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

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_KingwayTekTechnologyCoLtdListedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_MeWorksLIMITEDHKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |