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Document and Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Documentand Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Trading Symbol CHT
Entity Registrant Name Chunghwa Telecom Co Ltd.
Entity Central Index Key 0001132924
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Emerging Growth Company false
Entity Shell Company false
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 7,757,446,545