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Share-based Payment Arrangement (Tables)

12 Months Ended

Dec. 31, 2020

Senao International Co., Ltd. (SENAO) [Member]

Statement [LineItems]

Share-based Compensation Plan

a. SENAO share-based compensation plan (“SENAO Plan”) described as follows:

Effective Date		Grant Date		Stock Options  Units				Exercise Price
				(In Thousands)				NT$
2012.05.28		2013.05.07			10,000			$66.20 (Original price$93.00)

Outstanding Stock Options

Information about SENAO’s outstanding stock options for the years ended December 31, 2018 and 2019 was as follows:

		Year Ended December 31, 2018
		Granted on May 7, 2013
		Number of Options				Weighted- average Exercise Price
		(In Thousands)				NT$
Employee stock options
Options outstanding at beginning of the year			5,926			$	70.70
Options forfeited			(608	)			—
Options outstanding at end of the year			5,318				66.20
Options exercisable at end of the year			5,318				66.20

		Year Ended December 31, 2019
		Granted on May 7, 2013
		Number of Options				Weighted- average Exercise Price
		(In Thousands)				NT$
Employee stock options
Options outstanding at beginning of the year			5,318			$	66.20
Options forfeited			(5,318	)			—
Options outstanding at end of the year			—				—
Options exercisable at end of the year			—				—

Assumptions used to Evaluate Options and Fair Value of Options

SENAO used the fair value method to evaluate the options using the Black-Scholes model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted on May 7, 2013
Grant-date share price (NT$)		$	93.00
Exercise price (NT$)		$	93.00
Dividend yield			—
Risk-free interest rate			0.91	%
Expected life		4.375 years
Expected volatility			36.22	%
Weighted average fair value of grants (NT$)		$	28.72

SENAO used the fair value method to evaluate share-based payment transaction using the Black-Scholes model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted on May 7, 2018
Grant-date share price (NT$)		$	51.60
Exercise price (NT$)		$	49.28
Dividend yield			—
Risk-free interest rate			0.59	%
Expected life		18 days
Expected volatility			8.78	%
Weighted average fair value of grants (NT$)		$	2.34

Share-based Compensation Plan

a. SENAO share-based compensation plan (“SENAO Plan”) described as follows:

Effective Date		Grant Date		Stock Options  Units				Exercise Price
				(In Thousands)				NT$
2012.05.28		2013.05.07			10,000			$66.20 (Original price$93.00)

Outstanding Stock Options

Information about SENAO’s outstanding stock options for the years ended December 31, 2018 and 2019 was as follows:

		Year Ended December 31, 2018
		Granted on May 7, 2013
		Number of Options				Weighted- average Exercise Price
		(In Thousands)				NT$
Employee stock options
Options outstanding at beginning of the year			5,926			$	70.70
Options forfeited			(608	)			—
Options outstanding at end of the year			5,318				66.20
Options exercisable at end of the year			5,318				66.20

		Year Ended December 31, 2019
		Granted on May 7, 2013
		Number of Options				Weighted- average Exercise Price
		(In Thousands)				NT$
Employee stock options
Options outstanding at beginning of the year			5,318			$	66.20
Options forfeited			(5,318	)			—
Options outstanding at end of the year			—				—
Options exercisable at end of the year			—				—

CHIEF Telecom Inc. (CHIEF) [Member]

Statement [LineItems]

Share-based Compensation Plan

c. CHIEF share-based compensation plan (“CHIEF Plan”) described as follows:

Effective Date		Grant Date		Stock Options Units				Exercise Price
								NT$
2015.11.17		2015.10.22			2,000.00			$34.40 (Original price$43.00)
2017.12.18		2017.12.19			950.00			$132.70 (Original price$147.00)
		2018.10.31			50.00			$138.70 (Original price$147.00)
2020.09.16		2020.11.13			200.00			$206.00

Outstanding Stock Options

Information about CHIEF’s outstanding stock options for the years ended December 31, 2018, 2019 and 2020 was as follows:

		Year Ended December 31, 2018
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			1,936.00			$	34.40				950.00			$	147.00				—			$	—
Options granted			—				—				—				—				50.00				147.00
Options exercised			(1,027.25	)			34.40				—				—				—				—
Options forfeited			(26.00	)			—				(25.00	)			—				—				—
Options outstanding at end of the year			882.75				34.40				925.00				140.60				50.00				147.00
Options exercisable at end of the year			416.50				34.40				—				—				—				—

		Year Ended December 31, 2019
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			882.75			$	34.40				925.00			$	140.60				50.00			$	147.00
Options exercised			(547.25	)			34.40				—				—				—				—
Options forfeited			(21.25	)			—				(28.00	)			—				(4.00	)			—
Options outstanding at end of the year			314.25				34.40				897.00				135.60				46.00				141.70
Options exercisable at end of the year			314.25				34.40				448.50				135.60				—				—

		Year Ended December 31, 2020
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018								Granted on November 13, 2020
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			314.25			$	34.40				897.00			$	135.60				46.00			$	141.70				—			$	—
Options granted			—				—				—				—				—				—				200				206.00
Options exercised			(314.25	)			34.40				(448.50	)			135.60				(21.00	)			138.70				—				—
Options forfeited			—				—				(21.00	)			—				(4.00	)			—				—				—
Options outstanding at end of the year			—				—				427.50				132.70				21.00				138.70				200.00				206.00
Options exercisable at end of the year			—				—				213.75				132.70				—				—				—				—

Employee Stock Options Outstanding

As of December 31, 2019, information about employee stock options outstanding was as follows:

Granted on October 22, 2015
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	34.40				314.25				0.81			$	34.40				314.25			$	34.40

Granted on December 19, 2017
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	135.60				897.00				2.96			$	135.60				448.50			$	135.60

Granted on October 31, 2018
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	141.70				46.00				3.83			$	141.70				—			$	—

As of December 31, 2020, information about employee stock options outstanding was as follows:

Granted on December 19, 2017
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	132.70				427.50				1.96			$	132.70				213.75			$	132.70

Granted on October 31, 2018
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	138.70				21.00				2.83			$	138.70				—			$	—

Granted on November 13, 2020
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	206.00				200.00				4.87			$	206.00				—			$	—

As of December 31, 2020, all the stock options granted on October 22, 2015 were exercised or forfeited.

Assumptions used to Evaluate Options and Fair Value of Options

CHIEF used the fair value method to evaluate the options using the Black-Scholes model and binomial option pricing model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted on October 22, 2015				Stock Options Granted on December 19, 2017				Stock Options Granted on October 31, 2018				Stock Options Granted on November 13, 2020
Grant-date share price (NT$)		$	39.55			$	95.92			$	166.00			$	356.00
Exercise price (NT$)		$	43.00			$	147.00			$	147.00			$	206.00
Dividend yield			—				—				—				—
Risk-free interest rate			0.86	%			0.62	%			0.72	%			0.18	%
Expected life		5 years				5 years				5 years				5 years
Expected volatility			21.02	%			17.35	%			16.60	%			34.61	%
Weighted average fair value of grants (NT$)		$	4,863			$	2,318			$	33,540			$	173,893

CHIEF used the fair value method to evaluate the options granted to employees on May 22, 2018 using the Black-Scholes model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted on May 22, 2018
Grant-date share price (NT$)		$	156.41
Exercise price (NT$)		$	170.00
Dividend yield			—
Risk-free interest rate			0.34	%
Expected life		7 days
Expected volatility			14.33	%
Weighted average fair value of grants (NT$)		$	—

Share-based Compensation Plan

c. CHIEF share-based compensation plan (“CHIEF Plan”) described as follows:

Effective Date		Grant Date		Stock Options Units				Exercise Price
								NT$
2015.11.17		2015.10.22			2,000.00			$34.40 (Original price$43.00)
2017.12.18		2017.12.19			950.00			$132.70 (Original price$147.00)
		2018.10.31			50.00			$138.70 (Original price$147.00)
2020.09.16		2020.11.13			200.00			$206.00

Outstanding Stock Options

Information about CHIEF’s outstanding stock options for the years ended December 31, 2018, 2019 and 2020 was as follows:

		Year Ended December 31, 2018
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			1,936.00			$	34.40				950.00			$	147.00				—			$	—
Options granted			—				—				—				—				50.00				147.00
Options exercised			(1,027.25	)			34.40				—				—				—				—
Options forfeited			(26.00	)			—				(25.00	)			—				—				—
Options outstanding at end of the year			882.75				34.40				925.00				140.60				50.00				147.00
Options exercisable at end of the year			416.50				34.40				—				—				—				—

		Year Ended December 31, 2019
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			882.75			$	34.40				925.00			$	140.60				50.00			$	147.00
Options exercised			(547.25	)			34.40				—				—				—				—
Options forfeited			(21.25	)			—				(28.00	)			—				(4.00	)			—
Options outstanding at end of the year			314.25				34.40				897.00				135.60				46.00				141.70
Options exercisable at end of the year			314.25				34.40				448.50				135.60				—				—

		Year Ended December 31, 2020
		Granted on October 22, 2015								Granted on December 19, 2017								Granted on October 31, 2018								Granted on November 13, 2020
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			314.25			$	34.40				897.00			$	135.60				46.00			$	141.70				—			$	—
Options granted			—				—				—				—				—				—				200				206.00
Options exercised			(314.25	)			34.40				(448.50	)			135.60				(21.00	)			138.70				—				—
Options forfeited			—				—				(21.00	)			—				(4.00	)			—				—				—
Options outstanding at end of the year			—				—				427.50				132.70				21.00				138.70				200.00				206.00
Options exercisable at end of the year			—				—				213.75				132.70				—				—				—				—

Employee Stock Options Outstanding

As of December 31, 2019, information about employee stock options outstanding was as follows:

Granted on October 22, 2015
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	34.40				314.25				0.81			$	34.40				314.25			$	34.40

Granted on December 19, 2017
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	135.60				897.00				2.96			$	135.60				448.50			$	135.60

Granted on October 31, 2018
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	141.70				46.00				3.83			$	141.70				—			$	—

As of December 31, 2020, information about employee stock options outstanding was as follows:

Granted on December 19, 2017
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	132.70				427.50				1.96			$	132.70				213.75			$	132.70

Granted on October 31, 2018
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	138.70				21.00				2.83			$	138.70				—			$	—

Granted on November 13, 2020
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	206.00				200.00				4.87			$	206.00				—			$	—

As of December 31, 2020, all the stock options granted on October 22, 2015 were exercised or forfeited.

CHT Security Co., Ltd. (CHTSC) [Member]

Statement [LineItems]

Outstanding Stock Options

Information about CHTSC’s outstanding stock options for the years ended December 31, 2019 and 2020 was as follows:

		Year Ended December 31,
		2019							2020
		Granted on December 20, 2019							Granted on December 20, 2019
		Number of Options				Weighted- average Exercise Price			Number of Options				Weighted- average Exercise Price
						NT$							NT$
Employee stock options
Options outstanding at beginning of the year			—			$	—			4,500			$	19.085
Options granted			4,500				19.085			—				—
Options forfeited			—				—			(172	)			—
Options outstanding at end of the year			4,500				19.085			4,328				19.085
Options exercisable at end of the year			—				—			1,082				19.085

Employee Stock Options Outstanding

As of December 31, 2019, information about employee stock options outstanding was as follows:

Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	19.085				4,500				4.97			$	19.085				—			$	—

As of December 31, 2020, information about employee stock options outstanding was as follows:

Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	19.085				4,328				3.97			$	19.085				1,082			$	19.085

Assumptions used to Evaluate Options and Fair Value of Options

CHTSC used the fair value method to evaluate the options using the Black-Scholes model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted on December 20, 2019
Grant-date share price (NT$)		$	20.17
Exercise price (NT$)		$	19.085
Dividend yield			12.49	%
Risk-free interest rate			0.54	%
Expected life		5 years
Expected volatility			42.41	%
Weighted average fair value of grants (NT$)		$	2,470

Outstanding Stock Options

Information about CHTSC’s outstanding stock options for the years ended December 31, 2019 and 2020 was as follows:

		Year Ended December 31,
		2019							2020
		Granted on December 20, 2019							Granted on December 20, 2019
		Number of Options				Weighted- average Exercise Price			Number of Options				Weighted- average Exercise Price
						NT$							NT$
Employee stock options
Options outstanding at beginning of the year			—			$	—			4,500			$	19.085
Options granted			4,500				19.085			—				—
Options forfeited			—				—			(172	)			—
Options outstanding at end of the year			4,500				19.085			4,328				19.085
Options exercisable at end of the year			—				—			1,082				19.085

Employee Stock Options Outstanding

As of December 31, 2019, information about employee stock options outstanding was as follows:

Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	19.085				4,500				4.97			$	19.085				—			$	—

As of December 31, 2020, information about employee stock options outstanding was as follows:

Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	19.085				4,328				3.97			$	19.085				1,082			$	19.085

IISI Plan [Member]

Statement [LineItems]

Outstanding Stock Options

Information about IISI’s outstanding stock options for the year ended December 31, 2020 was as follows:

		Year Ended December 31, 2020
		Granted in August 2013								Granted in January 2014
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			—			$	—				—			$	—
Options outstanding upon the date of business combination			1,022.96				14.00				580.00				14.00
Options exercised			(432.50	)			14.00				(50.00	)			14.00
Options forfeited			(590.46	)			—				—				—
Options outstanding at end of the year			—				—				530.00				14.00
Options exercisable at end of the year			—				—				530.00				14.00

Employee Stock Options Outstanding

As of December 31, 2020, information about employee stock options outstanding was as follows:

Granted in January 2014
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	14.00				530.00				0.04			$	14.00				530.00			$	14.00

Assumptions used to Evaluate Options and Fair Value of Options

IISI used the fair value method to evaluate the options using the Black-Scholes model and the related assumptions and the fair value of the options were as follows:

		Stock Options Granted in August 2013				Stock Options Granted in January 2014
Grant-date share price (NT$)		$	12.51			$	14.51
Exercise price (NT$)		$	14.00			$	14.00
Dividend yield			6	%			6	%
Risk-free interest rate		1.20%-1.39%				1.16%-1.32%
Expected life		4.5-5.5 years				4.5-5.5 years
Expected volatility		36.01%-36.62%				35.28%-35.97%
Weighted average fair value of grants (NT$)		$	12.51			$	14.51

Outstanding Stock Options

Information about IISI’s outstanding stock options for the year ended December 31, 2020 was as follows:

		Year Ended December 31, 2020
		Granted in August 2013								Granted in January 2014
		Number of Options				Weighted Average Exercise Price (NT$)				Number of Options				Weighted Average Exercise Price (NT$)
Employee stock options
Options outstanding at beginning of the year			—			$	—				—			$	—
Options outstanding upon the date of business combination			1,022.96				14.00				580.00				14.00
Options exercised			(432.50	)			14.00				(50.00	)			14.00
Options forfeited			(590.46	)			—				—				—
Options outstanding at end of the year			—				—				530.00				14.00
Options exercisable at end of the year			—				—				530.00				14.00

Employee Stock Options Outstanding

As of December 31, 2020, information about employee stock options outstanding was as follows:

Granted in January 2014
Options Outstanding																Options Exercisable
Range of Exercise Price				Number of Options				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number of Options				Weighted Average Exercise Price
NT$								(Years)				NT$								NT$
$	14.00				530.00				0.04			$	14.00				530.00			$	14.00

X

- Definition

Disclosure of significant assumptions used to estimate fair value of options granted explanatory.

+ References

No definition available.

+ Details

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Namespace Prefix:	cht_
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X

- Definition

Statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	cht_
Data Type:	xbrli:stringItemType
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X

- Definition

The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-Subparagraph b
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