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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Property Plant And Equipment [Line Items]

Summary of Assets Used by the Company Explanatory

		December 31
		2020				2021
		NT$				NT$
		(In Millions)
Assets used by the Company		$	273,823			$	281,849
Assets subject to operating leases			7,593				7,251
		$	281,416			$	289,100

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, 2020		$	—			$	(1,375	)		$	(27,977	)		$	(11,068	)		$	(590,338	)		$	(3,694	)		$	(7,662	)		$	(29	)		$	(642,143	)
Depreciation    expenses			—				(43	)			(1,366	)			(770	)			(23,994	)			(68	)			(666	)			—				(26,907	)
Disposal			—				19				49				1,243				20,600				45				504				29				22,489
Effect of foreign    exchange    differences			—				—				—				—				41				—				—				—				41
Acquired by    business    combinations    (Note 14)			—				—				—				(40	)			—				—				(54	)			—				(94	)
Others			—				—				47				(4	)			28				(1	)			(48	)			—				22
Balance on    December 31,    2020		$	—			$	(1,399	)		$	(29,247	)		$	(10,639	)		$	(593,663	)		$	(3,718	)		$	(7,926	)		$	—			$	(646,592	)
Balance on    December 31,    2020, net		$	101,991			$	231			$	41,642			$	1,767			$	117,113			$	176			$	2,374			$	8,529			$	273,823
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

(Concluded)

Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory

Depreciation expense for assets used by the Company is computed using the straight-line method over the following estimated service lives:

Land improvements		10-30 years
Buildings
Main buildings		20-60 years
Other building facilities		3-15 years
Computer equipment		1-8 years
Telecommunications equipment
Telecommunication circuits		2-30 years
Telecommunication machinery and antennas equipment		2-30 years
Transportation equipment		3-10 years
Miscellaneous equipment
Leasehold improvements		1-9 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
		2020				2021
		NT$				NT$
		(In Millions)
Year 1		$	115			$	107
Year 2			95				82
Year 3			75				62
Year 4			53				55
Year 5			38				39
Onwards			58				78
		$	434			$	423

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

Disclosure Of Property Plant And Equipment [Line Items]

Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory

The above items of property, plant and equipment subject to operating leases are depreciated on a straight-line basis over their estimated useful lives as follows:

Land improvements		10-30 years
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

The future aggregate lease collection under operating lease for the freehold plant, property and equipment was as follows:

		December 31
		2020				2021
		NT$				NT$
		(In Millions)
Year 1		$	347			$	371
Year 2			288				301
Year 3			231				210
Year 4			164				159
Year 5			125				135
Onwards			1,180				1,177
		$	2,335			$	2,353

Assets Used by the Company [Member]

Disclosure Of Property Plant And Equipment [Line Items]

Summary of Property, Plant and Equipment

a. Assets used by the Company

		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, 2019		$	100,355			$	1,600			$	69,328			$	14,258			$	711,863			$	3,882			$	9,874			$	18,645			$	929,805
Additions			—				—				1,221				57				120				1				149				21,612				23,160
Disposal			(38	)			(7	)			(3	)			(1,916	)			(30,417	)			(51	)			(405	)			—				(32,837	)
Effect of foreign    exchange    differences			—				—				—				—				(37	)			—				(1	)			(6	)			(44	)
Others			(1,214	)			25				455				606				24,503				80				473				(26,499	)			(1,571	)
Balance on    December 31,    2019		$	99,103			$	1,618			$	71,001			$	13,005			$	706,032			$	3,912			$	10,090			$	13,752			$	918,513
Accumulated    depreciation    and impairment
Balance on    January 1, 2019		$	—			$	(1,337	)		$	(26,862	)		$	(12,143	)		$	(596,850	)		$	(3,651	)		$	(7,292	)		$	—			$	(648,135	)
Depreciation    expenses			—				(43	)			(1,301	)			(827	)			(23,906	)			(91	)			(688	)			—				(26,856	)
Disposal			—				6				3				1,909				30,380				51				402				—				32,751
Impairment losses			—				—				—				—				—				—				(64	)			(29	)			(93	)
Effect of foreign    exchange    differences			—				—				—				—				16				—				1				—				17
Others			—				(1	)			183				(7	)			22				(3	)			(21	)			—				173
Balance on    December 31,    2019		$	—			$	(1,375	)		$	(27,977	)		$	(11,068	)		$	(590,338	)		$	(3,694	)		$	(7,662	)		$	(29	)		$	(642,143	)
Balance on    January 1,    2019, net		$	100,355			$	263			$	42,466			$	2,115			$	115,013			$	231			$	2,582			$	18,645			$	281,670
Balance on    December 31,    2019, net		$	99,103			$	243			$	43,024			$	1,937			$	115,694			$	218			$	2,428			$	13,723			$	276,370
Cost
Balance on    January 1, 2020		$	99,103			$	1,618			$	71,001			$	13,005			$	706,032			$	3,912			$	10,090			$	13,752			$	918,513
Additions			67				—				18				55				118				1				150				24,786				25,195
Disposal			(270	)			(19	)			(49	)			(1,245	)			(20,619	)			(45	)			(520	)			(29	)			(22,796	)
Effect of foreign    exchange    differences			—				—				—				—				(91	)			—				—				(7	)			(98	)
Acquired by    business    combinations    (Note 14)			—				—				—				70				—				—				72				—				142
Others			3,091				31				(81	)			521				25,336				26				508				(29,973	)			(541	)
Balance on    December 31,    2020		$	101,991			$	1,630			$	70,889			$	12,406			$	710,776			$	3,894			$	10,300			$	8,529			$	920,415

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