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v3.20.1

Property, Plant and Equipment - Summary of Property, Plant and Equipment - Assets Subject to Operating Leases (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 Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 288,914 |  |  |
Depreciation expenses | (26,930) |  | $ (27,461) | $ (28,143)
Additions | 23,164 |  | 27,979 | 26,069
Impairment losses | 93 | $ 4 | 0 | 0
Ending balance | 283,694 | $ 9,484 | 288,914 |
Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Ending balance | 7,324 |  |  |
As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 5,935 |  |  |
Ending balance |  |  | 5,935 |
Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 940,891 |  | 946,460 | 936,128
Additions |  |  | 27,979 | 26,069
Ending balance |  |  | 940,891 | 946,460
Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Effect of retrospective application of IFRS 16 | 7,201 |  |  |
Additions | 4 |  |  |
Transferred from (to) assets used by the Company | 1,616 |  |  |
Ending balance | 8,821 |  | 0 |
Carrying Amount [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 7,201 |  |  |
Ending balance |  |  | 7,201 |
Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (651,977) |  | (657,752) | (644,958)
Depreciation expenses |  |  | (27,461) | (28,143)
Ending balance |  |  | (651,977) | (657,752)
Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | (74) |  |  |
Effect of retrospective application of IFRS 16 | (1,266) |  |  |
Transferred from (to) assets used by the Company | (157) |  |  |
Ending balance | (1,497) |  | 0 |
Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,266) |  |  |
Ending balance |  |  | (1,266) |
Land [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 103,972 |  |  |
Ending balance |  |  | 103,972 |
Land [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Ending balance | 4,979 |  |  |
Land [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,617 |  |  |
Ending balance |  |  | 3,617 |
Land [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 103,972 |  | 104,079 | 103,872
Additions |  |  | 0 | 0
Ending balance |  |  | 103,972 | 104,079
Land [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Effect of retrospective application of IFRS 16 | 3,617 |  |  |
Additions | 0 |  |  |
Transferred from (to) assets used by the Company | 1,362 |  |  |
Ending balance | 4,979 |  | 0 |
Land [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,617 |  |  |
Ending balance |  |  | 3,617 |
Land [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses |  |  | 0 | 0
Ending balance |  |  | 0 | 0
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | 0 |  |  |
Effect of retrospective application of IFRS 16 | 0 |  |  |
Transferred from (to) assets used by the Company | 0 |  |  |
Ending balance | 0 |  | 0 |
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Ending balance |  |  | 0 |
Land improvements [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 263 |  |  |
Ending balance |  |  | 263 |
Land improvements [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Ending balance | 0 |  |  |
Land improvements [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Ending balance |  |  | 0 |
Land improvements [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,601 |  | 1,595 | 1,581
Additions |  |  | 0 | 0
Ending balance |  |  | 1,601 | 1,595
Land improvements [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Effect of retrospective application of IFRS 16 | 1 |  |  |
Additions | 0 |  |  |
Transferred from (to) assets used by the Company | (1) |  |  |
Ending balance | 0 |  | 0 |
Land improvements [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1 |  |  |
Ending balance |  |  | 1 |
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,338) |  | (1,293) | (1,248)
Depreciation expenses |  |  | (45) | (50)
Ending balance |  |  | (1,338) | (1,293)
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | 0 |  |  |
Effect of retrospective application of IFRS 16 | (1) |  |  |
Transferred from (to) assets used by the Company | 1 |  |  |
Ending balance | 0 |  | 0 |
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1) |  |  |
Ending balance |  |  | (1) |
Buildings [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 44,784 |  |  |
Ending balance |  |  | 44,784 |
Buildings [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Ending balance | 2,345 |  |  |
Buildings [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 2,318 |  |  |
Ending balance |  |  | 2,318 |
Buildings [Member] | Carrying Amount [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 72,911 |  | 72,694 | 67,738
Additions |  |  | 21 | 30
Ending balance |  |  | 72,911 | 72,694
Buildings [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Effect of retrospective application of IFRS 16 | 3,583 |  |  |
Additions | 4 |  |  |
Transferred from (to) assets used by the Company | 255 |  |  |
Ending balance | 3,842 |  | 0 |
Buildings [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,583 |  |  |
Ending balance |  |  | 3,583 |
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (28,127) |  | (26,799) | (25,591)
Depreciation expenses |  |  | (1,356) | (1,402)
Ending balance |  |  | (28,127) | $ (26,799)
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  |  |
Depreciation expenses | (74) |  |  |
Effect of retrospective application of IFRS 16 | (1,265) |  |  |
Transferred from (to) assets used by the Company | (158) |  |  |
Ending balance | (1,497) |  | 0 |
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ (1,265) |  |  |
Ending balance |  |  | $ (1,265) |

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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_75_a&doctype=Standard -URIDate 2019-03-27 + Details
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