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Financial Instruments - Summary of Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Mandatorily at FVTPL	$ 5,436,280	$ 195,973	$ 6,523,583
Measured at amortized cost (Note 1)	200,732,680	7,236,218	147,521,583
Trade receivables, net	115,462,210	4,162,300	91,833,989
Held for trading	417,660	15,056	1,537,208
Financial liabilities for hedging	11,497,896	414,488	11,188,244
Measured at amortized cost (Note 2)	339,445,544	12,236,683	304,737,749
Financial assets at fair value through other comprehensive income, category [member]
Disclosure of detailed information about financial instruments [line items]
Equity instruments	943,354	34,007	728,398
Debt instruments	1,076,458	38,805	1,012,736
Trade receivables, net	$ 6,092,462	$ 219,627	$ 626,413

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Financial liabilities designated as hedging instruments at fair value through profit or loss

+ References

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- Definition

The amount of current debt instruments issued. [Refer: Debt instruments issued]

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The amount of current 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, mandatorily measured at fair value]

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- Definition

The amount of current financial liabilities at fair value through profit or loss that meet the definition of held for trading. [Refer: Current financial liabilities at fair value through profit or loss]

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The amount of current investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income]

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The amount of current trade receivables. [Refer: Trade receivables]

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

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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