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Additional Information of Expenses by Nature - Summary of Additional Information of Expenses by Nature (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Expense by nature [line items] |  |  |  |
Depreciation of property, plant and equipment | $ 255,796.0 | $ 8,630.1 | $ 220,085.0 | $ 219,303.4
Amortization of intangible assets | 4,346.7 | 146.6 | 3,743.4 | 3,202.2
Research and development costs expensed as incurred | 80,732.5 | $ 2,723.8 | 71,207.7 | 65,544.6
Defined contribution plans | 2,369.9 |  | 2,164.9 | 2,002.6
Defined benefit plans | 271.5 |  | 272.2 | 278.9
Post-employment benefits | 2,641.4 |  | 2,437.1 | 2,281.5
Other employee benefits | 101,488.7 |  | 97,248.0 | 88,929.4
Employee benefits expenses | 104,130.1 |  | 99,685.1 | 91,210.9
Cost of revenue [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Depreciation of property, plant and equipment | 235,985.2 |  | 203,476.8 | 204,126.2
Amortization of intangible assets | 2,135.5 |  | 2,028.5 | 1,642.1
Defined benefit plans | 175.3 |  | 177.0 | 189.5
Employee benefits expenses | 61,026.1 |  | 58,493.5 | 52,983.2
Operating expenses [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Depreciation of property, plant and equipment | 19,746.3 |  | 16,583.1 | 15,152.2
Amortization of intangible assets | 2,211.2 |  | 1,714.9 | 1,560.1
Employee benefits expenses | 43,104.0 |  | 41,191.6 | 38,227.7
Other operating income and expenses [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Depreciation of property, plant and equipment | $ 64.5 |  | $ 25.1 | $ 25.0

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_104&doctype=Standard -URIDate 2017-03-09 + Details
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