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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance as of January 1, 2017 | $ 230,048.5 | $ 275,822.4
Financing Cash Flow | (34,381.1) | (30,578.0)
Non-cash changes Foreign Exchange Movement | 1,105.5 | (9,113.6)
Non-cash changes Other Changes | (6,029.2) | (6,082.3)
Balance as of December 31, 2017 | 190,743.7 | 230,048.5
Short-term loans [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance as of January 1, 2017 | 63,766.8 | 57,958.2
Financing Cash Flow | 23,923.0 | 10,394.3
Non-cash changes Foreign Exchange Movement | 1,064.9 | (4,585.7)
Balance as of December 31, 2017 | 88,754.7 | 63,766.8
Bonds payable [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance as of January 1, 2017 | 16,080.6 | 26,670.6
Financing Cash Flow | (279.2) | (2,872.3)
Non-cash changes Foreign Exchange Movement | 423.5 | (1,609.0)
Non-cash changes Other Changes | (6,035.9) | (6,108.7)
Balance as of December 31, 2017 | 10,189.0 | 16,080.6
Guarantee deposits [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance as of January 1, 2017 | 150,201.1 | 191,193.6
Financing Cash Flow | (58,024.9) | (38,100.0)
Non-cash changes Foreign Exchange Movement | (382.9) | (2,918.9)
Non-cash changes Other Changes | 6.7 | 26.4
Balance as of December 31, 2017 | $ 91,800.0 | $ 150,201.1

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44D&doctype=Standard -URIDate 2018-03-16 + Details
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