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Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Document Information [Line Items]    
Document Type 20-F  
Amendment Flag false  
Document Period End Date Dec. 31, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
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 Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
ICFR Auditor Attestation Flag true  
Entity Common Stock, Shares Outstanding 7,757,446,545  
Entity File Number 001-31731  
Entity Incorporation, State or Country Code F5  
Entity Address, Address Line One 21-3 Xinyi Road  
Entity Address, Address Line Two Section 1  
Entity Address, City or Town Taipei  
Entity Address, Country TW  
Entity Address, Postal Zip Code 10048  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Document Accounting Standard International Financial Reporting Standards  
Document Registration Statement false  
Auditor Name PricewaterhouseCoopers, Taiwan Deloitte & Touche
Auditor Location Taipei, Taiwan Taipei, Taiwan Republic of China
Auditor Firm ID 1345 1060
Document Financial Statement Error Correction [Flag] false  
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheet of Chunghwa Telecom Co., Ltd. and its subsidiaries (the “Company”) as of December 31, 2024, and the related consolidated statements of comprehensive income, of changes in equity and of cash flows for the year then ended, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024, and the results of its operations and its cash flows for the year then ended in conformity with IFRS Accounting Standards as issued by the International Accounting Standards Board. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Chunghwa Telecom Co., Ltd. and subsidiaries (the “Company”) as of December 31, 2023, the related consolidated statements of comprehensive income, changes in equity, and cash flows for each of the two years in the period ended December 31, 2023, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2023, in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board.

  
Common Shares, Par Value NT$10 Per Share [Member]    
Document Information [Line Items]    
No Trading Symbol Flag true  
Title of 12(b) Security Common Shares, par value NT$10 per share  
Security Exchange Name NYSE  
American Depositary Shares [Member]    
Document Information [Line Items]    
Title of 12(b) Security American Depositary Shares, as evidenced by AmericanDepositary Receipts, each representing 10 Common Shares  
Security Exchange Name NYSE  
Trading Symbol CHT  
Business Contact [Member]    
Document Information [Line Items]    
Entity Address, Address Line One 21-3 Xinyi Road  
Entity Address, Address Line Two Section 1  
Entity Address, City or Town Taipei  
Entity Address, Country TW  
Entity Address, Postal Zip Code 10048  
Contact Personnel Name Cho-Fen (Angela) Tsai  
City Area Code +886 2  
Local Phone Number 2344-5488  
Contact Personnel Email Address chtir@cht.com.tw