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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Disclosure Of Property Plant And Equipment [Line Items]

Summary of Assets Used by the Company Explanatory

		December 31
		2022				2023
		NT$				NT$
		(In Millions)
Assets used by the Company		$	285,329			$	285,085
Assets subject to operating leases			6,199				7,253
		$	291,528			$	292,338

Summary of Property, Plant and Equipment

		Land				Land Improvements				Buildings				Computer Equipment				Telecommuni- cations Equipment				Transportation Equipment				Miscellaneous Equipment				Construction in Progress and Equipment to be Accepted				Total
		NT$				NT$				NT$				NT$				NT$				NT$				NT$				NT$				NT$
		(In Millions)
Accumulated    depreciation    and impairment
Balance on    January 1, 2022		$	—			$	(1,442	)		$	(30,578	)		$	(9,632	)		$	(590,533	)		$	(3,699	)		$	(8,205	)		$	—			$	(644,089	)
Depreciation    expenses			—				(39	)			(1,452	)			(725	)			(25,654	)			(77	)			(754	)			—				(28,701	)
Disposal			—				7				7				807				18,382				104				388				—				19,695
Effect of foreign    exchange    differences			—				—				—				—				(110	)			—				(2	)			—				(112	)
Others			—				—				(240	)			(4	)			(42	)			(1	)			(69	)			—				(356	)
Balance on    December 31,    2022		$	—			$	(1,474	)		$	(32,263	)		$	(9,554	)		$	(597,957	)		$	(3,673	)		$	(8,642	)		$	—			$	(653,563	)
Balance on    December 31,    2022, net		$	103,664			$	201			$	40,267			$	1,535			$	122,111			$	298			$	2,826			$	14,427			$	285,329
Cost
Balance on    January 1, 2023		$	103,664			$	1,675			$	72,530			$	11,089			$	720,068			$	3,971			$	11,468			$	14,427			$	938,892
Additions			99				—				36				127				106				3				243				29,780				30,394
Disposal			(2	)			—				(1	)			(1,049	)			(24,877	)			(112	)			(418	)			—				(26,459	)
Effect of foreign    exchange    differences			—				—				—				—				(5	)			—				(3	)			—				(8	)
Others			(876	)			34				(810	)			878				26,143				188				801				(28,270	)			(1,912	)
Balance on    December 31,    2023		$	102,885			$	1,709			$	71,755			$	11,045			$	721,435			$	4,050			$	12,091			$	15,937			$	940,907
Accumulated    depreciation    and impairment
Balance on    January 1, 2023		$	—			$	(1,474	)		$	(32,263	)		$	(9,554	)		$	(597,957	)		$	(3,673	)		$	(8,642	)		$	—			$	(653,563	)
Depreciation    expenses			—				(34	)			(1,439	)			(698	)			(25,704	)			(94	)			(797	)			—				(28,766	)
Disposal			—				—				—				1,049				24,867				113				411				—				26,440
Impairment losses			—				—				—				—				(299	)			—				—				—				(299	)
Effect of foreign    exchange    differences			—				—				—				—				5				—				1				—				6
Others			—				—				418				(18	)			(43	)			(1	)			4				—				360
Balance on    December 31,    2023		$	—			$	(1,508	)		$	(33,284	)		$	(9,221	)		$	(599,131	)		$	(3,655	)		$	(9,023	)		$	—			$	(655,822	)
Balance on    December 31,    2023, net		$	102,885			$	201			$	38,471			$	1,824			$	122,304			$	395			$	3,068			$	15,937			$	285,085

Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory

Land improvements		10-30 years
Buildings
Main buildings		20-60 years
Other building facilities		3-15 years
Computer equipment		2-8 years
Telecommunications equipment
Telecommunication circuits		2-30 years
Telecommunication machinery and antennas equipment		2-30 years
Transportation equipment		2-10 years
Miscellaneous equipment
Leasehold improvements		1-18 years
Mechanical and air conditioner equipment		3-16 years
Others		1-15 years

Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment

The future aggregate lease collection under operating lease for investment properties is as follows:

		December 31
		2022				2023
		NT$				NT$
		(In Millions)
Year 1		$	118			$	168
Year 2			99				157
Year 3			90				134
Year 4			70				105
Year 5			44				83
Onwards			149				435
		$	570			$	1,082

Property, plant and equipment subject to operating leases [member]

Disclosure Of Property Plant And Equipment [Line Items]

Summary of Property, Plant and Equipment

b.Assets subject to operating leases

		Land				Buildings				Total
		NT$				NT$				NT$
		(In Millions)
Cost
Balance on January 1, 2021		$	4,973			$	4,236			$	9,209
Others			(164	)			(102	)			(266	)
Balance on December 31, 2021		$	4,809			$	4,134			$	8,943
Accumulated depreciation and impairment
Balance on January 1, 2021		$	—			$	(1,616	)		$	(1,616	)
Depreciation expenses			—				(77	)			(77	)
Others			—				1				1
Balance on December 31, 2021		$	—			$	(1,692	)		$	(1,692	)
Balance on December 31, 2021, net		$	4,809			$	2,442			$	7,251
Cost
Balance on January 1, 2022		$	4,809			$	4,134			$	8,943
Additions			—				—				—
Others			(433	)			(949	)			(1,382	)
Balance on December 31, 2022		$	4,376			$	3,185			$	7,561
Accumulated depreciation and impairment
Balance on January 1, 2022		$	—			$	(1,692	)		$	(1,692	)
Depreciation expenses			—				(59	)			(59	)
Others			—				389				389
Balance on December 31, 2022		$	—			$	(1,362	)		$	(1,362	)
Balance on December 31, 2022, net		$	4,376			$	1,823			$	6,199
Cost
Balance on January 1, 2023		$	4,376			$	3,185			$	7,561
Additions			—				4				4
Others			548				942				1,490
Balance on December 31, 2023		$	4,924			$	4,131			$	9,055
Accumulated depreciation and impairment
Balance on January 1, 2023		$	—			$	(1,362	)		$	(1,362	)
Depreciation expenses			—				(73	)			(73	)
Others			—				(367	)			(367	)
Balance on December 31, 2023		$	—			$	(1,802	)		$	(1,802	)
Balance on December 31, 2023, net		$	4,924			$	2,329			$	7,253

Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory

Buildings
Main buildings		35-60 years
Other building facilities		3-15 years

Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment

		December 31
		2022				2023
		NT$				NT$
		(In Millions)
Year 1		$	389			$	381
Year 2			281				279
Year 3			211				221
Year 4			177				176
Year 5			149				146
Onwards			1,122				1,025
		$	2,329			$	2,228

Assets Used by the Company [Member]

Disclosure Of Property Plant And Equipment [Line Items]

Summary of Property, Plant and Equipment

		Land				Land Improvements				Buildings				Computer Equipment				Telecommuni- cations Equipment				Transportation Equipment				Miscellaneous Equipment				Construction in Progress and Equipment to be Accepted				Total
		NT$				NT$				NT$				NT$				NT$				NT$				NT$				NT$				NT$
		(In Millions)
Cost
Balance on    January 1, 2021		$	101,991			$	1,630			$	70,889			$	12,406			$	710,776			$	3,894			$	10,300			$	8,529			$	920,415
Additions			—				—				37				72				84				—				198				35,222				35,613
Disposal			—				(1	)			(29	)			(1,734	)			(27,916	)			(84	)			(470	)			—				(30,234	)
Effect of foreign    exchange    differences			—				—				—				—				(64	)			—				(2	)			(6	)			(72	)
Others			654				33				461				473				30,654				117				783				(32,959	)			216
Balance on    December 31,    2021		$	102,645			$	1,662			$	71,358			$	11,217			$	713,534			$	3,927			$	10,809			$	10,786			$	925,938
Accumulated    depreciation    and impairment
Balance on    January 1, 2021		$	—			$	(1,399	)		$	(29,247	)		$	(10,639	)		$	(593,663	)		$	(3,718	)		$	(7,926	)		$	—			$	(646,592	)
Depreciation    expenses			—				(43	)			(1,401	)			(716	)			(24,802	)			(65	)			(701	)			—				(27,728	)
Disposal			—				1				29				1,724				27,900				84				466				—				30,204
Effect of foreign    exchange    differences			—				—				—				—				31				—				1				—				32
Others			—				(1	)			41				(1	)			1				—				(45	)			—				(5	)
Balance on    December 31,    2021		$	—			$	(1,442	)		$	(30,578	)		$	(9,632	)		$	(590,533	)		$	(3,699	)		$	(8,205	)		$	—			$	(644,089	)
Balance on    December 31,    2021, net		$	102,645			$	220			$	40,780			$	1,585			$	123,001			$	228			$	2,604			$	10,786			$	281,849
Cost
Balance on    January 1, 2022		$	102,645			$	1,662			$	71,358			$	11,217			$	713,534			$	3,927			$	10,809			$	10,786				925,938
Additions			460				—				133				102				149				1				253				30,167				31,265
Disposal			(4	)			(6	)			(7	)			(808	)			(18,395	)			(104	)			(392	)			—				(19,716	)
Effect of foreign    exchange    differences			—				—				—				—				209				—				4				19				232
Others			563				19				1,046				578				24,571				147				794				(26,545	)			1,173
Balance on    December 31,    2022		$	103,664			$	1,675			$	72,530			$	11,089			$	720,068			$	3,971			$	11,468			$	14,427			$	938,892

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