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Investment Properties - Summary of Investment Properties (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | $ 8,287 |  |  |
Depreciation expense | (25) |  | $ (21) | $ (21)
Reversal of impairment loss | 57 | $ 2 | 19 | 11
Ending balance | 8,169 | $ 273 | 8,287 |
Carrying Amount [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | 9,392 |  | 9,135 | 9,195
Additions | 1 |  | 6 |
Disposal | (6) |  |  |
Reclassification | (173) |  | 251 | (60)
Ending balance | 9,214 |  | 9,392 | 9,135
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | (1,105) |  | (1,087) | (1,080)
Depreciation expense | (25) |  | (21) | (21)
Disposal | 6 |  |  |
Reclassification | 22 |  | (16) | 3
Reversal of impairment loss | 57 |  | 19 | 11
Ending balance | $ (1,045) |  | $ (1,105) | $ (1,087)

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- Definition The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_iv&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_76&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of reversal of impairment loss recognised in profit or loss for investment property. [Refer: Reversal of impairment loss recognised in profit or loss; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 76 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_76_g&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_v&doctype=Standard -URIDate 2019-03-27 + Details
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