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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, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 283,694 |  | $ 288,914 |
Depreciation expenses | (26,989) |  | (26,930) | $ (27,461)
Additions | 25,195 |  | 23,164 | 27,979
Impairment losses | 0 | $ 0 | 93 | 0
Ending balance | 281,416 | $ 10,022 | 283,694 | 288,914
Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 7,324 |  |  |
Ending balance | 7,593 |  | 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
Additions |  |  |  | 27,979
Others |  |  |  | (258)
Ending balance |  |  |  | 940,891
Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 8,821 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | 7,201 |
Additions |  |  | 4 |
Transferred from (to) assets used by the Company |  |  | 1,616 |
Others | 388 |  |  |
Ending balance | 9,209 |  | 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)
Depreciation expenses |  |  |  | (27,461)
Others |  |  |  | 28
Ending balance |  |  |  | (651,977)
Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,497) |  | 0 |
Depreciation expenses | (82) |  | (74) |
Effect of retrospective application of IFRS 16 |  |  | (1,266) |
Transferred from (to) assets used by the Company |  |  | (157) |
Others | (37) |  |  |
Ending balance | (1,616) |  | (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] |  |  |  |
Beginning balance | 4,979 |  |  |
Ending balance | 4,973 |  | 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
Additions |  |  |  | 0
Others |  |  |  | (36)
Ending balance |  |  |  | 103,972
Land [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 4,979 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | 3,617 |
Additions |  |  | 0 |
Transferred from (to) assets used by the Company |  |  | 1,362 |
Others | (6) |  |  |
Ending balance | 4,973 |  | 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
Depreciation expenses |  |  |  | 0
Others |  |  |  | 0
Ending balance |  |  |  | 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 |  | 0 |
Depreciation expenses | 0 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | 0 |
Transferred from (to) assets used by the Company |  |  | 0 |
Others | 0 |  |  |
Ending balance | 0 |  | 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] |  |  |  |
Beginning balance | 0 |  |  |
Ending balance | 0 |  | 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
Additions |  |  |  | 0
Others |  |  |  | 6
Ending balance |  |  |  | 1,601
Land improvements [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | 1 |
Additions |  |  | 0 |
Transferred from (to) assets used by the Company |  |  | (1) |
Others | 0 |  |  |
Ending balance | 0 |  | 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)
Depreciation expenses |  |  |  | (45)
Others |  |  |  | 0
Ending balance |  |  |  | (1,338)
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 |  | 0 |
Depreciation expenses | 0 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | (1) |
Transferred from (to) assets used by the Company |  |  | 1 |
Others | 0 |  |  |
Ending balance | 0 |  | 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] |  |  |  |
Beginning balance | 2,345 |  |  |
Ending balance | 2,620 |  | 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
Additions |  |  |  | 21
Others |  |  |  | 196
Ending balance |  |  |  | 72,911
Buildings [Member] | Carrying Amount [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,842 |  | 0 |
Effect of retrospective application of IFRS 16 |  |  | 3,583 |
Additions |  |  | 4 |
Transferred from (to) assets used by the Company |  |  | 255 |
Others | 394 |  |  |
Ending balance | 4,236 |  | 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)
Depreciation expenses |  |  |  | (1,356)
Others |  |  |  | 28
Ending balance |  |  |  | (28,127)
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,497) |  | 0 |
Depreciation expenses | (82) |  | (74) |
Effect of retrospective application of IFRS 16 |  |  | (1,265) |
Transferred from (to) assets used by the Company |  |  | (158) |
Others | (37) |  |  |
Ending balance | $ (1,616) |  | (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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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