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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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
-Name IFRS
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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
-Number 7
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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]

+ 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 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]

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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	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets at FVTPL, mandatorily measured at FVTPL	$ 58.3	$ 2,259.4
Financial assets at FVTOCI, investments in equity and debt instruments	128,184.5	126,963.4
Financial assets at FVTOCI	131,364.3	129,918.7
Level 3 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at FVTOCI, investments in equity and debt instruments	5,390.0	4,514.9	$ 4,235.2	$ 4,208.9
Measured at fair value on a recurring basis [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at FVTOCI	131,364.3	129,918.7
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	3,179.8	2,955.3
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	24,093.8	13,329.2
Measured at fair value on a recurring basis [member] \| Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at FVTOCI	101,880.5	112,074.6
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	3,179.8	2,955.3
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	5,390.0	4,514.9
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	58.3	2,259.4
Financial liabilities at FVTPL, Held for trading	1,828.3	94.1
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	58.3	2,259.4
Financial liabilities at FVTPL, Held for trading	1,828.3	94.1
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	58,907.9	56,593.6
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	58,907.9	56,593.6
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	32,188.8	43,977.1
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	32,188.8	43,977.1
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	7,523.4	8,368.3
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	7,523.4	8,368.3
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	24,121.9	13,459.5
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	24,041.3	13,279.2
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	80.6	180.3
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	52.5	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	52.5	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	0.3	0.1
Hedging derivative financial liabilities	10.2	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	0.3	0.1
Hedging derivative financial liabilities	10.2	1.2
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	5,390.0	4,514.9
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	$ 5,390.0	$ 4,514.9