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Related Parties Transactions - Details of Transactions Between the Company and Other Related Parties (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2019 USD ($)
Disclosure of transactions between related parties [Line Items] |  |  |  |
Revenues | $ 350 | $ 438 | $ 410 |
Operating Costs and Expenses | 1,040 | 1,379 | 1,270 |
Non-operating Income and Expenses | 45 | 31 | 32 |
Receivables | 17 | 24 |  | $ 1
Payables | 654 | 918 |  | $ 22
Acquisition of property, plant and equipment | 242 | 312 | 390 |
Prepaid rents - current |  | 205 |  |
Prepaid rents - noncurrent |  | 1,346 |  |
Prepaid rents |  | 1,551 |  |
Associates [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Revenues | 274 | 344 | 344 |
Operating Costs and Expenses | 964 | 1,304 | 1,197 |
Non-operating Income and Expenses | 41 | 31 | 32 |
Receivables | 10 | 11 |  |
Payables | 651 | 914 |  |
Customers' deposits | 8 | 6 |  |
Acquisition of property, plant and equipment | 242 | 312 | 390 |
Joint ventures [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Revenues | 0 | 0 | 1 |
Operating Costs and Expenses | 0 | 0 | 2 |
Others [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Revenues | 76 | 94 | 65 |
Operating Costs and Expenses | 76 | 75 | 71 |
Non-operating Income and Expenses | 4 | 0 | $ 0 |
Receivables | 7 | 13 |  |
Payables | $ 3 | $ 4 |  |

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- Definition Current prepaid rent in related parties. + References No definition available. + Details
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Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Customer's deposit in related parties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Non-operating income and expenses in related parties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Non current prepaid rent in related parties. + References No definition available. + Details
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Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Operating costs and expenses in related parties. + References No definition available. + Details
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Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Prepaid rent in related parties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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- Definition The amount of property and other assets purchased by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_21_b&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | debit
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- Definition The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_21_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of current receivables due from related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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- Details
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