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Advance Receipt - Additional Information (Detail) $ in Millions	Dec. 31, 2017 TWD ($)
Miscellaneous Current Liabilities [Abstract]
Performance guarantee for advance receipts from selling prepaid cards	$ 797

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- Definition

Performance guarantee for advance receipts from selling prepaid cards.

+ References

No definition available.

+ Details

Name:	cht_PerformanceGuaranteeForAdvanceReceiptsFromSellingPrepaidCards
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	ifrs-full_MiscellaneousCurrentLiabilitiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration