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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Cover [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol ASX
Entity Registrant Name ASE Technology Holding Co., Ltd.
Entity Central Index Key 0001122411
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 4,350,675,482
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Registration Statement false
Title of 12(b) Security Common Shares
Entity Interactive Data Current Yes
Entity Voluntary Filers No
Entity Address, Country TW
ICFR Auditor Attestation Flag true