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Financial Instruments - Fair Value of Financial Instruments Measured at Fair Value on a Recurring Basis (Detail) - TWD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTPL, Held for trading |  | $ 569.8
Available-for-sale financial assets |  | 98,248.5
Financial assets at FVTPL, mandatorily measured at FVTPL | $ 3,504.6 |
Financial assets at FVTOCI, investments in debt instruments | 103,472.4 |
Notes and accounts receivable, net |  | 684,416.6
Financial assets at FVTOCI | 107,067.5 |
Commercial paper [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 148.3
Level 3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTOCI, investments in debt instruments | 3,910.7 | 5,841.4
Measured at fair value on a recurring basis [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 93,374.2
Financial assets at FVTPL | 3,504.6 |
Financial assets at FVTOCI | 107,067.5 |
Hedging derivative financial assets |  | 34.4
Hedging derivative financial liabilities | 155.8 |
Measured at fair value on a recurring basis [member] | Loans and receivables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notes and accounts receivable, net | 3,595.1 |
Measured at fair value on a recurring basis [member] | Commercial paper [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 148.3
Financial assets at FVTOCI, investments in debt instruments | 107.6 |
Measured at fair value on a recurring basis [member] | Level 1 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 10,264.1
Financial assets at FVTOCI | 11,596.3 |
Hedging derivative financial assets |  | 27.0
Hedging derivative financial liabilities | 153.9 |
Measured at fair value on a recurring basis [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 83,110.1
Financial assets at FVTPL | 3,504.6 |
Financial assets at FVTOCI | 91,560.5 |
Hedging derivative financial assets |  | 7.4
Hedging derivative financial liabilities | 1.9 |
Measured at fair value on a recurring basis [member] | Level 2 [member] | Loans and receivables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notes and accounts receivable, net | 3,595.1 |
Measured at fair value on a recurring basis [member] | Level 2 [member] | Commercial paper [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 148.3
Financial assets at FVTOCI, investments in debt instruments | 107.6 |
Measured at fair value on a recurring basis [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTOCI | 3,910.7 |
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTPL, Held for trading |  | 569.8
Financial assets at FVTPL, mandatorily measured at FVTPL | 85.3 |
Financial liabilities at FVTPL, Held for trading | 40.8 | 26.7
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedging derivative financial assets | 23.5 | 7.4
Hedging derivative financial liabilities | 1.9 | 15.6
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTPL, Held for trading |  | 569.8
Financial assets at FVTPL, mandatorily measured at FVTPL | 85.3 |
Financial liabilities at FVTPL, Held for trading | 40.8 | 26.7
Measured at fair value on a recurring basis [member] | Forward exchange contracts [member] | Level 2 [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedging derivative financial assets | 23.5 | 7.4
Hedging derivative financial liabilities | 1.9 | 15.6
Measured at fair value on a recurring basis [member] | Corporate bonds [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 40,165.2
Financial assets at FVTOCI, investments in debt instruments | 40,753.6 |
Measured at fair value on a recurring basis [member] | Corporate bonds [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 40,165.2
Financial assets at FVTOCI, investments in debt instruments | 40,753.6 |
Measured at fair value on a recurring basis [member] | Agency bonds/Agency mortgage-backed securities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 29,235.4
Financial assets at FVTOCI, investments in debt instruments | 31,288.8 |
Measured at fair value on a recurring basis [member] | Agency bonds/Agency mortgage-backed securities [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 29,235.4
Financial assets at FVTOCI, investments in debt instruments | 31,288.8 |
Measured at fair value on a recurring basis [member] | Asset backed securities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 13,459.5
Financial assets at FVTOCI, investments in debt instruments | 15,670.3 |
Measured at fair value on a recurring basis [member] | Asset backed securities [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 13,459.5
Financial assets at FVTOCI, investments in debt instruments | 15,670.3 |
Measured at fair value on a recurring basis [member] | Government bonds [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 7,817.7
Financial assets at FVTOCI, investments in debt instruments | 11,151.3 |
Measured at fair value on a recurring basis [member] | Government bonds [member] | Level 1 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 7,716.0
Financial assets at FVTOCI, investments in debt instruments | 11,006.2 |
Measured at fair value on a recurring basis [member] | Government bonds [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 101.7
Financial assets at FVTOCI, investments in debt instruments | 145.1 |
Measured at fair value on a recurring basis [member] | Publicly traded stocks [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 2,548.1
Financial assets at FVTOCI, Investments in equity instruments | 590.1 |
Measured at fair value on a recurring basis [member] | Publicly traded stocks [member] | Level 1 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Available-for-sale financial assets |  | 2,548.1
Financial assets at FVTOCI, Investments in equity instruments | 590.1 |
Measured at fair value on a recurring basis [member] | Futures Contract [member] | Fair value hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedging derivative financial assets |  | 27.0
Hedging derivative financial liabilities | 153.9 |
Measured at fair value on a recurring basis [member] | Futures Contract [member] | Level 1 [member] | Fair value hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedging derivative financial assets |  | $ 27.0
Hedging derivative financial liabilities | 153.9 |
Measured at fair value on a recurring basis [member] | Agency mortgage backed securities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTPL, mandatorily measured at FVTPL | 3,419.3 |
Measured at fair value on a recurring basis [member] | Agency mortgage backed securities [member] | Level 2 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTPL, mandatorily measured at FVTPL | 3,419.3 |
Measured at fair value on a recurring basis [member] | Non-publicly traded stocks [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTOCI, Investments in equity instruments | 3,910.7 |
Measured at fair value on a recurring basis [member] | Non-publicly traded stocks [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at FVTOCI, Investments in equity instruments | $ 3,910.7 |

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_11A_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: Financial liabilities at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_e&doctype=Standard -URIDate 2018-03-16 + Details
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