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Financial Instruments - Remaining Contractual Maturity for Non-derivative Financial Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | $ 51,115 | $ 51,422
Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 41,808 | 41,934
1-3 Months [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 0 | 0
3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 2,990 | 3,217
1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 6,317 | 6,271
More Than 5 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Non-derivative financial liabilities | 0 | 0
Non-interest bearing [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 49,415 | 49,752
Non-interest bearing [Member] | Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 41,808 | 41,884
Non-interest bearing [Member] | 3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 2,890 | 3,197
Non-interest bearing [Member] | 1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 4,717 | 4,671
Non-interest bearing [Member] | More Than 5 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 0 | 0
Floating interest rate instruments [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | $ 1,700 | $ 1,670
Floating interest rate instruments [Member] | Weighted average [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Weighted Average Effective Interest Rate | 0.98% | 0.97%
Floating interest rate instruments [Member] | Less Than 1 Month [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | $ 0 | $ 50
Floating interest rate instruments [Member] | 1-3 Months [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 0 | 0
Floating interest rate instruments [Member] | 3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 100 | 20
Floating interest rate instruments [Member] | 1-5 Years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 1,600 | 1,600
Floating interest rate instruments [Member] | More Than 5 Year [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Loans | 0 | 0
Fair value interest rate risk [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Financial assets | 25,822 | 25,911
Cash flow interest rate risk [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Financial assets | 9,161 | 6,715
Financial liabilities | $ 1,700 | $ 1,670

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- Definition The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG31A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph B11D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B11D&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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