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Non-Cash Transactions - Non-cash Investing Activities (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Noncash Investing Activities [Abstract] |  |  |  |
Increase in property, plant and equipment | $ 25,195 |  | $ 23,164 | $ 27,979
Other payables | (1,684) |  | 1,002 | 571
Acquisition of property, plant and equipment | 23,511 | $ 838 | 24,166 | 28,550
Increase in investment properties | 1,359 |  | 1 | 6
Trade-in investment properties from asset exchange transaction (Note 16) | (1,305) |  | 0 | 0
Acquisition of investment properties | 54 | 2 | 1 | 6
Increase in intangible assets | 48,605 |  | 363 | 498
Changes in other assets | (1,000) |  | 0 | 0
Acquisition of intangible assets | 47,605 | 1,695 | 363 | 498
Disposal of property, plant and equipment, net | 307 |  | 86 | 122
Gain (loss) on disposal of property, plant and equipment | 1,428 | 51 | (38) | 142
Trade-in investment properties from asset exchange transaction (Note 16) | (1,305) |  | 0 | 0
Changes in other payables | (80) |  | 0 | 0
Changes in other current monetary assets | (31) |  | 0 | 0
Proceeds from disposal of property, plant and equipment | $ 319 | $ 11 | $ 48 | $ 264

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 + Details
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