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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTPL, mandatorily measured at FVTPL | $ 326.8 | $ 3,504.6 |
Financial assets at FVTOCI, investments in equity and debt instruments | 131,520.9 | 103,472.4 |
Financial assets at FVTOCI | 134,776.8 | 107,067.5 |
Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 4,208.9 | 3,910.7 | $ 5,841.4
Measured at fair value on a recurring basis [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTPL | 326.8 | 3,504.6 |
Financial assets at FVTOCI | 134,776.8 | 107,067.5 |
Hedging derivative financial assets | 25.9 |  |
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 | 3,255.9 | 3,595.1 |
Measured at fair value on a recurring basis [member] | Commercial paper [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, investments in equity and 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] |  |  |
Financial assets at FVTOCI | 12,678.1 | 11,596.3 |
Hedging derivative financial assets | 22.4 |  |
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] |  |  |
Financial assets at FVTPL | 203.0 | 3,504.6 |
Financial assets at FVTOCI | 118,013.6 | 91,560.5 |
Hedging derivative financial assets | 3.5 |  |
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 | 3,255.9 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and 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 FVTPL | 123.8 |  |
Financial assets at FVTOCI | 4,085.1 | 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, mandatorily measured at FVTPL | 162.1 | 85.3 |
Hedging derivative financial assets |  | 23.5 |
Financial liabilities at FVTPL, Held for trading | 982.3 | 40.8 |
Hedging derivative financial liabilities | 1.8 |  |
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 | 3.5 |  |
Hedging derivative financial liabilities |  | 1.9 |
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, mandatorily measured at FVTPL | 162.1 | 85.3 |
Hedging derivative financial assets |  | 23.5 |
Financial liabilities at FVTPL, Held for trading | 982.3 | 40.8 |
Hedging derivative financial liabilities | 1.8 |  |
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 | 3.5 |  |
Hedging derivative financial liabilities |  | 1.9 |
Measured at fair value on a recurring basis [member] | Convertible Bonds [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTPL, mandatorily measured at FVTPL | 123.8 |  |
Measured at fair value on a recurring basis [member] | Convertible Bonds [Member] | Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTPL, mandatorily measured at FVTPL | 123.8 |  |
Measured at fair value on a recurring basis [member] | Corporate bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 51,790.0 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 51,790.0 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 51,966.5 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 51,966.5 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 10,815.9 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 10,815.9 | 15,670.3 |
Measured at fair value on a recurring basis [member] | Government bonds [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 12,824.2 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 12,678.1 | 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] |  |  |
Financial assets at FVTOCI, investments in equity and debt instruments | 146.1 | 145.1 |
Measured at fair value on a recurring basis [member] | Publicly traded stocks [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
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] |  |  |
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 | 22.4 |  |
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 | 22.4 |  |
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 | 40.9 | 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 | 40.9 | 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 | 4,124.3 | 3,910.7 |
Measured at fair value on a recurring basis [member] | Non-publicly traded stocks [member] | Level 2 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 39.2 |  |
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 | $ 4,085.1 | $ 3,910.7 |

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_e&doctype=Standard -URIDate 2019-03-27 + Details
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