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Retirement Benefit Plans - Maturity Analysis of Undiscounted Benefit Payments (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)
Disclosure Of Defined Benefit Plans [Abstract]
2022	$ 2,693
2023	6,330
2024	9,721
2025	10,864
2026 and thereafter	36,890
Total	$ 66,498

X

- Definition

Estimated future benefit payments.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPayments
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated future benefit payments five fiscal years thereafter.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated future benefit payments next twelve months.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated future benefit payments year four.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPaymentsYearFour
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated future benefit payments year three.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPaymentsYearThree
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated future benefit payments year two.

+ References

No definition available.

+ Details

Name:	cht_EstimatedFutureBenefitPaymentsYearTwo
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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