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Inventories - Summary of Write downs reversals of Inventories (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Write-downs (reversals of write-downs) of inventories [abstract]
Write downs Reversals of Inventories	$ 3,664.5	$ (1,983.0)	$ 1,259.5

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- Definition

The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2020-01-01
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-URIDate 2020-01-01

+ Details

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- References

No definition available.

+ Details

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