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Equity - Summary of Treasury Shares (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2021 shares
Beginning balance	72,941
Addition	53,067
Ending balance	126,008
Shares repurchased for cancellation [member]
Beginning balance	0
Addition	53,067
Ending balance	53,067
Shares held by subsidiaries [member]
Beginning balance	72,941
Addition	0
Ending balance	72,941

X

- Definition

Number of treasury shares repurchase.

+ References

No definition available.

+ Details

Name:	asx_NumberOfTreasurySharesRepurchase
Namespace Prefix:	asx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Purchase of treasury shares shares.

+ References

No definition available.

+ Details

Name:	asx_PurchaseOfTreasurySharesShares
Namespace Prefix:	asx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=asx_SharesRepurchasedForCancellationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=asx_SharesHeldBySubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: