XML 207 R193.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | $ 51,422 | $ 52,338
Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 41,934 | 43,975
1-3 Months [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 0 | 38
3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 3,217 | 2,115
1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 6,271 | 6,210
Non-interest bearing [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 49,752 | 50,600
Non-interest bearing [Member] | Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 41,884 | 43,975
Non-interest bearing [Member] | 3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 3,197 | 2,015
Non-interest bearing [Member] | 1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 4,671 | 4,610
Floating interest rate instruments [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | $ 1,670 | $ 1,738
Floating interest rate instruments [Member] | Weighted average [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Weighted Average Effective Interest Rate | 0.97% | 1.00%
Floating interest rate instruments [Member] | Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | $ 50 | $ 0
Floating interest rate instruments [Member] | 1-3 Months [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 0 | 38
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 20 | 100
Floating interest rate instruments [Member] | 1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | $ 1,600 | $ 1,600

X
- Definition The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph IG31A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2016-03-31 + Details
Name: | ifrs-full_BankBorrowingsUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_7&doctype=Standard -URIDate 2016-03-31 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
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_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_39_a&doctype=Standard -URIDate 2016-03-31 + Details
Name: | ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph IG31A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2016-03-31 + Details
Name: | ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneMonthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=cht_NonInterestBearingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FloatingInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |