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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, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | $ 291,528 |  |  |
Depreciation expenses | (28,839) |  | $ (28,760) | $ (27,805)
Additions | 30,398 |  | 31,265 | 35,613
Impairment losses | 299 | $ 10 | 0 | 0
Ending balance | 292,338 | $ 9,547 | 291,528 |
Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 6,199 |  | 7,251 |
Ending balance | 7,253 |  | 6,199 | 7,251
Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 7,561 |  | 8,943 | 9,209
Additions | 4 |  | 0 |
Others | 1,490 |  | (1,382) | (266)
Ending balance | 9,055 |  | 7,561 | 8,943
Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,362) |  | (1,692) | (1,616)
Depreciation expenses | (73) |  | (59) | (77)
Others | (367) |  | 389 | 1
Ending balance | (1,802) |  | (1,362) | (1,692)
Land [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 4,376 |  | 4,809 |
Ending balance | 4,924 |  | 4,376 | 4,809
Land [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 4,376 |  | 4,809 | 4,973
Additions | 0 |  | 0 |
Others | 548 |  | (433) | (164)
Ending balance | 4,924 |  | 4,376 | 4,809
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 | 0
Depreciation expenses | 0 |  | 0 | 0
Others | 0 |  | 0 | 0
Ending balance | 0 |  | 0 | 0
Buildings [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 1,823 |  | 2,442 |
Ending balance | 2,329 |  | 1,823 | 2,442
Buildings [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | 3,185 |  | 4,134 | 4,236
Additions | 4 |  | 0 |
Others | 942 |  | (949) | (102)
Ending balance | 4,131 |  | 3,185 | 4,134
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Beginning balance | (1,362) |  | (1,692) | (1,616)
Depreciation expenses | (73) |  | (59) | (77)
Others | (367) |  | 389 | 1
Ending balance | $ (1,802) |  | $ (1,362) | $ (1,692)

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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 2023-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_a&doctype=Standard -URIDate 2023-03-23 + Details
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