The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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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
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The amount of financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss]

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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]

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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

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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

+ References

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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, 2020	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	$ 2,259.4	$ 326.8
Financial assets at FVTOCI, investments in equity and debt instruments	126,963.4	131,520.9
Financial assets at FVTOCI	129,918.7	134,776.8
Level 3 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at FVTOCI, investments in equity and debt instruments	4,514.9	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
Financial assets at FVTOCI	129,918.7	134,776.8
Hedging derivative financial assets		25.9
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	2,955.3	3,255.9
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	13,329.2	12,678.1
Hedging derivative financial assets		22.4
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
Financial assets at FVTOCI	112,074.6	118,013.6
Hedging derivative financial assets		3.5
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	2,955.3	3,255.9
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	4,514.9	4,085.1
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	2,259.4	162.1
Financial liabilities at FVTPL, Held for trading	94.1	982.3
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		1.8
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	2,259.4	162.1
Financial liabilities at FVTPL, Held for trading	94.1	982.3
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		1.8
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	56,593.6	51,790.0
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	56,593.6	51,790.0
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	43,977.1	51,966.5
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	43,977.1	51,966.5
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	8,368.3	10,815.9
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	8,368.3	10,815.9
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	13,459.5	12,824.2
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	13,279.2	12,678.1
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	180.3	146.1
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	50.0
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	50.0
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	0.1	22.4
Hedging derivative financial liabilities	1.2
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	0.1	22.4
Hedging derivative financial liabilities	1.2
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
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
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	4,514.9	4,124.3
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	$ 4,514.9	$ 4,085.1