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Investment Properties - Summary of Investment Properties (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | $ 8,115 |  |  |
Depreciation expense | (21) |  | $ (19) | $ (18)
Reversal of impairment loss | 11 | $ 0 | 148 | 142
Ending balance | 8,048 | $ 272 | 8,115 |
Gross carrying amount [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | 9,195 |  | 9,058 | 8,883
Disposal |  |  |  | 0
Reclassification | (60) |  | 137 | 175
Ending balance | 9,135 |  | 9,195 | 9,058
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure of detailed information about investment property [Line Items] |  |  |  |
Beginning balance | (1,080) |  | (1,156) | (1,262)
Depreciation expense | (21) |  | (19) | (18)
Disposal |  |  |  | 0
Reclassification | 3 |  | (53) | (18)
Reversal of impairment loss | 11 |  | 148 | 142
Ending balance | $ (1,087) |  | $ (1,080) | $ (1,156)

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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 2016-01-13 -Paragraph 79 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_79_d_iv&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_76&doctype=Standard -URIDate 2016-03-31 + Details
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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 decrease in investment property resulting from disposals. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 76 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_76_c&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_79_d_iii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Expiry date 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. Effective 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_76&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_79_d&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_b&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 76 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_76_g&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_79_d_v&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount transferred from (to) inventories and owner-occupied property to (from) investment property. [Refer: Inventories; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 76 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_76_f&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2016-01-13 -Paragraph 79 -Subparagraph d -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2016-03-30&anchor=para_79_d_vii&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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