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Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2024

Disclosure of subsidiaries [Line Items]

Detail Information of Subsidiaries

						Percentage of Ownership interests
						December 31
Name of Investor		Name of Investee		Main Businesses and Products		2023				2024				Note
Chunghwa Telecom      Co., Ltd.		Senao International Co., Ltd.      (“SENAO”)		Handset and peripherals retailer, sales of CHT mobile phone plans as an agent			28				28			a)
		Light Era Development Co.,      Ltd. (“LED”)		Planning and development of real estate and intelligent buildings, and property management			100				100
		Donghwa Telecom Co., Ltd.      (“DHT”)		International private leased circuit, IP VPN service, and IP transit services			100				100
		Chunghwa Telecom      Singapore Pte.,      Ltd. (“CHTS”)		International private leased circuit, IP VPN service, and IP transit services			100				100
		Chunghwa System Integration      Co., Ltd. (“CHSI”)		Providing system integration services and telecommunications equipment			100				100
		Chunghwa Investment Co.,      Ltd. (“CHI”)		Investment			89				89
		CHIEF Telecom Inc.      (“CHIEF”)		Network integration, internet data center (“IDC”), communications integration and cloud application services			56				56			b)
		CHYP Multimedia Marketing      & Communications      Co., Ltd. (“CHYP”)		Digital information supply services and advertisement services			100				100
		Prime Asia Investments      Group Ltd. (“Prime Asia”)		Investment			100				100
		Spring House Entertainment      Tech. Inc. (“SHE”)		Software design services, internet contents production and play, and motion picture production and distribution			56				56
		Chunghwa Telecom Global,       Inc. (“CHTG”)		International private leased circuit, internet services, and transit services			100				100
		Chunghwa Telecom Vietnam       Co., Ltd. (“CHTV”)		Intelligent energy saving solutions, international circuit, and information and communication technology (“ICT”) services			100				100
		Smartfun Digital Co., Ltd.      (“SFD”)		Providing diversified family education digital services			65				65
		Chunghwa Telecom Japan      Co., Ltd. (“CHTJ”)		International private leased circuit, IP VPN service, and IP transit services			100				100
		Chunghwa Sochamp      Technology Inc.      (“CHST”)		Design, development and production of Automatic License Plate Recognition software and hardware			37				37			c)
		Honghwa International Co.,      Ltd. (“HHI”)		Telecommunications engineering, sales agent of mobile phone plan application and other business services, etc.			100				100
		Chunghwa Leading Photonics      Tech Co., Ltd. (“CLPT”)		Production and sale of electronic components and finished products			75				70			d)
		Chunghwa Telecom      (Thailand) Co., Ltd.      (“CHTT”)		International private leased circuit, IP VPN service, ICT and cloud VAS services			100				100

(Continued)

						Percentage of Ownership interests
						December 31
Name of Investor		Name of Investee		Main Businesses and Products		2023				2024				Note
		CHT Security Co., Ltd.      (“CHTSC”)		Computing equipment installation, wholesale of computing and business machinery equipment and software, management consulting services, data processing services, digital information supply services and internet identity services			69				63			e)
		International Integrated      Systems, Inc. (“IISI”)		IT solution provider, IT application consultation, system integration and package solution			51				50			f)
		Chunghwa Digital Cultural    and Creative Capital Co.,    Ltd (“CDCC Capital”)		Investment and management consulting			—				100			g)
		Chunghwa Telecom Europe    GmbH (“CHTEU”)		International private leased circuit, internet services, transit services and ICT services			—				100			h)
Senao International Co.,      Ltd.		Senao International (Samoa)      Holding Ltd. (“SIS”)		International investment			—				—			i)
		Youth Co., Ltd. (“Youth”)		Sale of information and communication technologies products			96				96
		Aval Technologies Co., Ltd.      (“Aval”)		Sale of information and communication technologies products			100				100
		Senyoung Insurance Agent      Co., Ltd. (“SENYOUNG”)		Property and liability insurance agency			100				100
Youth Co., Ltd.		ISPOT Co., Ltd. (“ISPOT”)		Sale of information and communication technologies products			100				100
		Youyi Co., Ltd. (“Youyi”)		Maintenance of information and communication technologies products			—				—			j)
Aval Technologies Co.,      Ltd.		Wiin Technology Co., Ltd.      (“Wiin”)		Sale of information and communication technologies products			100				100
Senyoung Insurance      Agent Co., Ltd.		Senaolife Insurance Agent      Co., Ltd. (“Senaolife”)		Life insurance services			—				—			k)
CHIEF Telecom Inc.		Unigate Telecom Inc.      (“Unigate”)		Telecommunications and internet service			100				100
		Chief International Corp.      (“CIC”)		Telecommunications and internet service			100				100
		Shanghai Chief Telecom Co.,      Ltd. (“SCT”)		Telecommunications and internet service			49				49			l)
Chunghwa Investment      Co., Ltd.		Chunghwa Precision Test      Tech. Co., Ltd. (“CHPT”)		Production and sale of semiconductor testing components and printed circuit board			34				34			m)
Chunghwa Precision Test      Tech. Co., Ltd.		Chunghwa Precision Test      Tech. USA Corporation      (“CHPT (US)”)		Design and after-sale services of semiconductor testing components and printed circuit board			100				100
		CHPT Japan Co., Ltd.      (“CHPT (JP)”)		Related services of electronic parts, machinery processed products and printed circuit board			100				100
		Chunghwa Precision Test      Tech. International, Ltd.      (“CHPT (International)”)		Wholesale and retail of electronic materials, and investment			100				100
		TestPro Investment Co., Ltd.      (“TestPro”)		Investment			100				100

(Continued)

Percentage of Ownership interests

December 31

Name of Investor

Name of Investee

Main Businesses and Products

2023

2024

Note

TestPro Investment Co.,    Ltd.

NavCore Tech. Co., Ltd.    (“NavCore”)

Sale and manufacturing of smart equipment, smart factory software and hardware integration and technical consulting service

54

54

Senao International    (Samoa) Holding Ltd.

Senao International HK    Limited (“SIHK”)

International investment

—

—

n)

Prime Asia Investments    Group Ltd.

Chunghwa Hsingta Co., Ltd.    (“CHC”)

Investment

100

100

Chunghwa Precision    Test Tech.    International, Ltd.

Shanghai Taihua Electronic    Technology Limited    (“STET”)

Design of printed circuit board and related consultation service

100

100

Su Zhou Precision Test Tech.    Ltd. (“SZPT”)

Assembly processed of circuit board, design of printed circuit board and related consultation service

100

100

International Integrated    Systems, Inc.

Infoexplorer International    Co., Ltd.(“IESA”)

Investment

—

—

o)

Unitronics Technology Corp.    (“UTC”)

Development and maintenance of information system

100

100

p)

Infoexplorer    International Co., Ltd.

International Integrated    Systems (Hong Kong)    Limited (“IEHK”)

Investment and technical consulting service

—

—

q)

(Concluded)

a)Chunghwa continues to control more than half of seats of the Board of Directors of SENAO through the support of large beneficial stockholders. As a result, the Company treated SENAO as a subsidiary.

b)CHIEF issued new shares in December 2023 and December 2024 as its employees exercised options. Therefore, the Company’s ownership interest in CHIEF decreased to 58.63% and 58.57% as of December 31, 2023 and 2024, respectively.

c)Chunghwa controls more than half of seats of the Board of Directors of CHST as of December 31, 2024. As a result, the Company treated CHST as a subsidiary. For the information of changes in Chunghwa’s control over CHST in January 2025, please refer to Note 43.

d)CLPT issued new shares in May 2023 and July 2024 as its employees exercised options. Therefore, the Company’s ownership interest in CLPT decreased to 74.56% and 69.87% as of December 31, 2023 and 2024, respectively.

e)CHTSC issued new shares in February 2023, May 2023, January 2024, March 2024 and December 2024 as its employees exercised options. In addition, Chunghwa disposed of some shares of CHTSC in August 2024 before CHTSC traded its shares on the emerging stock market according to the local requirements. Therefore, the Company’s ownership interest in CHTSC decreased to 69.28% and 63.45% as of December 31, 2023 and 2024, respectively.

f)Chunghwa disposed of some shares of IISI in August 2024 before IISI traded its shares on the emerging stock market according to the local requirements. Therefore, the Company’s ownership interest in IISI decreased to 49.64% as of December 31, 2024. Chunghwa continues to control more than half of seats of the Board of Directors of IISI. As a result, the Company treated IISI as a subsidiary.

g)Chunghwa invested and established CDCC Capital in February 2024. Chunghwa obtained 100% ownership interest of CDCC Capital.

h)Chunghwa invested and established CHTEU in July 2024. Chunghwa obtained 100% ownership interest of CHTEU.

i)SIS completed its liquidation in September 2023.

j)Youyi completed its liquidation in November 2023.

k)In order to coordinate with financial planning and adjustment of organizational resources, the Board of Directors of SENYOUNG approved the merger with Senaolife. SENYOUNG was the surviving company. The merger was completed on May 1, 2023.

l)CHIEF has more than half of seats of the Board of Directors of SCT according to the mutual agreements among stockholders and gained control over SCT; hence, SCT is deemed as a subsidiary of the Company.

m)Though the Company’s ownership interest in CHPT is less than 50%, the management considered the absolute and relative size of ownership interest, and the dispersion of shares owned by the other stockholders and concluded that the Company has a sufficiently dominant voting interest to direct the relevant activities; hence, CHPT is deemed as a subsidiary of the Company.

n)SIHK completed its liquidation in July 2023.

o)IESA completed its liquidation in September 2023.

p)IISI purchased shares of UTC in August 2023. Therefore, the Company’s ownership interest in UTC increased to 100%.

q)IEHK completed its liquidation in June 2023.

Detailed Information of Equity Transactions

The detailed information of the equity transactions for the years ended December 31, 2022, 2023 and 2024 was as follows:

		Year Ended December 31, 2022
		CHIEF Share-Based Payment				CHTSC Share-Based Payment				Chunghwa Not Proportionately Participating in the Capital Increase of CHST
		NT$				NT$				NT$
		(In Millions)
Cash consideration received from noncontrolling interests		$	39			$	35			$	15
The proportionate share of the carrying amount of the net assets    of the subsidiary transferred to noncontrolling interests			(17	)			(30	)			(10	)
Differences arising from equity transactions		$	22			$	5			$	5
Line items for equity transaction adjustments
Additional paid-in capital - arising from changes in equities of    subsidiaries		$	22			$	5			$	5

		Year Ended December 31, 2023
		CHIEF Share-Based Payment				CHTSC Share-Based Payment				CLPT Share-Based Payment				Purchasing UTC shares
		NT$				NT$				NT$				NT$
		(In Millions)
Cash consideration received from (paid to) noncontrolling interests(Note)		$	8			$	15			$	1			$	—
The proportionate share of the carrying amount of the net assets    of the subsidiary transferred from (to) noncontrolling interests			(2	)			(13	)			(1	)			—
Differences arising from equity transactions		$	6			$	2			$	—			$	—
Line items for equity transaction adjustments
Additional paid-in capital - arising from the difference    between the consideration received or paid and the    carrying amount of the subsidiaries’ net assets during    actual disposal or acquisition		$	—			$	—			$	—			$	—
Additional paid-in capital - arising from changes in equities of    subsidiaries		$	6			$	2			$	—			$	—

		Year Ended December 31, 2024
		CHIEF Share-Based Payment				CHTSC Share-Based Payment				CLPT Share-Based Payment				Disposal of CHTSC Shares				Disposal of IISI Shares
		NT$				NT$				NT$				NT$				NT$
		(In Millions)
Cash consideration received from noncontrolling interests (Note)		$	14			$	14			$	9			$	207			$	52
The proportionate share of the carrying amount of the net assets    of the subsidiary transferred to noncontrolling interests			(10	)			(14	)			(13	)			(19	)			(16	)
Differences arising from equity transactions		$	4			$	—			$	(4	)		$	188			$	36
Line items for equity transaction adjustments
Additional paid-in capital - arising from the difference    between the consideration received or paid and the    carrying amount of the subsidiaries’ net assets during    actual disposal or acquisition		$	—			$	—			$	—			$	188			$	36
Additional paid-in capital - arising from changes in equities of    subsidiaries		$	4			$	—			$	(4	)		$	—			$	—

Less than wholly owned subsidiaries that have material noncontrolling interests [Member]

Disclosure of subsidiaries [Line Items]

Detail Information of Subsidiaries

		Place of Incorporation		Proportion of Ownership Interests and Voting Rights Held by Noncontrolling Interests
		and Principal		December 31
Subsidiaries		Place of Business		2023		2024
SENAO		Taiwan		72%		72%
CHPT		Taiwan		66%		66%

		Profit Allocated to Noncontrolling Interests												Accumulated Noncontrolling Interests
		Year Ended December 31												December 31
		2022				2023				2024				2023				2024
		NT$				NT$				NT$				NT$				NT$
		(In Millions)
SENAO		$	462			$	510			$	353			$	4,533			$	4,549
CHPT		$	496			$	15			$	295				4,994				5,289
Individually immaterial subsidiaries with    noncontrolling interests															2,905				3,142
														$	12,432			$	12,980

Summarized Financial Information Before Intercompany Eliminations

		December 31
		2023				2024
		NT$				NT$
		(In Millions)
Current assets		$	6,540			$	6,738
Noncurrent assets		$	3,141			$	3,522
Current liabilities		$	2,982			$	3,582
Noncurrent liabilities		$	459			$	416
Equity attributable to the parent		$	1,707			$	1,713
Equity attributable to noncontrolling interests		$	4,533			$	4,549

		Year Ended December 31
		2022				2023				2024
		NT$				NT$				NT$
						(In Millions)
Revenues and income		$	31,602			$	31,675			$	32,503
Costs and expenses			30,958				30,964				32,012
Profit for the year		$	644			$	711			$	491
Profit attributable to the parent		$	182			$	201			$	138
Profit attributable to noncontrolling interests			462				510				353
Profit for the year		$	644			$	711			$	491
Other comprehensive income (loss) attributable to the parent		$	11			$	(9	)		$	11
Other comprehensive income (loss) attributable to noncontrolling      interests			26				(23	)			30
Other comprehensive income (loss) for the year		$	37			$	(32	)		$	41
Total comprehensive income attributable to the parent		$	192			$	192			$	149
Total comprehensive income attributable to noncontrolling      interests			488				487				383
Total comprehensive income for the year		$	680			$	679			$	532
Net cash flow from operating activities		$	(329	)		$	1,146			$	904
Net cash flow from investing activities			36				36				(356	)
Net cash flow from financing activities			(826	)			(873	)			(819	)
Effect of exchange rate changes on cash and cash equivalents			1				—				—
Net cash inflow (outflow)		$	(1,118	)		$	309			$	(271	)
Dividends paid to noncontrolling interests		$	371			$	408			$	371

Summarized financial information in respect of CHPT and its subsidiaries that has material noncontrolling interests is set out below. The summarized financial information below represented amounts before intercompany eliminations.

		December 31
		2023				2024
		NT$				NT$
		(In Millions)
Current assets		$	3,773			$	4,936
Noncurrent assets		$	4,499			$	4,222
Current liabilities		$	677			$	1,102
Noncurrent liabilities		$	23			$	21
Equity attributable to CHI		$	2,578			$	2,746
Equity attributable to noncontrolling interests		$	4,994			$	5,289

		Year Ended December 31
		2022				2023				2024
		NT$				NT$				NT$
						(In Millions)
Revenues and income		$	4,434			$	2,941			$	3,670
Costs and expenses			3,673				2,905				3,207
Profit for the year		$	761			$	36			$	463
Profit attributable to CHI		$	265			$	21			$	168
Profit attributable to noncontrolling interests			496				15				295
Profit for the year		$	761			$	36			$	463
Other comprehensive income (loss) attributable to CHI		$	5			$	(1	)		$	6
Other comprehensive income (loss) attributable to noncontrolling      interests			7				(2	)			10
Other comprehensive income (loss) for the year		$	12			$	(3	)		$	16
Total comprehensive income attributable to CHI		$	270			$	20			$	174
Total comprehensive income attributable to noncontrolling      interests			503				13				305
Total comprehensive income for the year		$	773			$	33			$	479
Net cash flow from operating activities		$	1,401			$	325			$	616
Net cash flow from investing activities			(1,011	)			(244	)			(188	)
Net cash flow from financing activities			(388	)			(409	)			(43	)
Effect of exchange rate changes on cash and cash equivalents			8				(2	)			15
Net cash inflow (outflow)		$	10			$	(330	)		$	400
Dividends paid to noncontrolling interests		$	293			$	253			$	11

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