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Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue [Abstract]

Summary of Revenue

		Year Ended December 31
		2019				2020				2021
		NT$				NT$				NT$
		(In Millions)
Revenue from contracts with customers		$	206,360			$	206,396			$	208,412
Other revenues
Government grants income			205				219				1,037
Rental income			818				843				864
Others			137				151				165
			1,160				1,213				2,066
Total		$	207,520			$	207,609			$	210,478

Summary of Disaggregation of Revenue

a. Disaggregation of revenue

2019

		Domestic Fixed Communi- cations Business				Mobile Communi- cations Business				Internet Business				International Fixed Communi- cations Business				Others				Total
		NT$				NT$				NT$				NT$				NT$				NT$
		(In Millions)
Main Products and Service Revenues
Mobile services revenue		$	—			$	58,703			$	—			$	—			$	—			$	58,703
Sales of products			1,957				35,545				41				265				3,785				41,593
Local telephone and domestic long distance telephone    services revenue			27,929				—				—				—				—				27,929
Broadband access and domestic leased line services    revenue			22,116				—				—				—				—				22,116
Data Communications internet services revenue			—				—				21,003				—				—				21,003
International network and leased line services    revenue			—				—				—				7,066				—				7,066
Others			13,064				1,142				8,790				4,144				810				27,950
		$	65,066			$	95,390			$	29,834			$	11,475			$	4,595			$	206,360

2020

		Domestic Fixed Communi- cations Business				Mobile Communi- cations Business				Internet Business				International Fixed Communi- cations Business				Others				Total
		NT$				NT$				NT$				NT$				NT$				NT$
		(In Millions)
Main Products and Service Revenues
Mobile services revenue		$	—			$	56,724			$	—			$	—			$	—			$	56,724
Sales of products			2,214				32,112				107				313				4,645				39,391
Local telephone and domestic long distance telephone    services revenue			26,475				—				—				—				—				26,475
Broadband access and domestic leased line services    revenue			22,420				—				—				—				—				22,420
Data Communications internet services revenue			—				—				21,447				—				—				21,447
International network and leased line services    revenue			—				—				—				3,884				—				3,884
Others			17,695				1,307				10,255				4,485				2,313				36,055
		$	68,804			$	90,143			$	31,809			$	8,682			$	6,958			$	206,396

2021

		Domestic Fixed Communi- cations Business				Mobile Communi- cations Business				Internet Business				International Fixed Communi- cations Business				Others				Total
		NT$				NT$				NT$				NT$				NT$				NT$
		(In Millions)
Main Products and Service Revenues
Mobile services revenue		$	—			$	58,048			$	—			$	—			$	—			$	58,048
Sales of products			2,173				35,414				128				12				5,180				42,907
Local telephone and domestic long distance telephone    services revenue			25,704				—				—				—				—				25,704
Broadband access and domestic leased line services    revenue			23,012				—				—				—				—				23,012
Data Communications internet services revenue			—				—				22,281				—				—				22,281
International network and leased line services    revenue			—				—				—				4,367				—				4,367
Others			13,255				1,222				10,428				4,246				2,942				32,093
		$	64,144			$	94,684			$	32,837			$	8,625			$	8,122			$	208,412

Summary of Contract Balances

b. Contract balances

		January 1,				December 31
		2020				2020				2021
		NT$				NT$				NT$
		(In Millions)
Trade notes and accounts receivable (Note 10)		$	26,408			$	22,622			$	23,947
Contract assets
Products and service bundling		$	6,943			$	7,232			$	7,197
Others			116				612				983
Less : Loss allowance			(17	)			(18	)			(18	)
		$	7,042			$	7,826			$	8,162
Current		$	4,441			$	5,331			$	5,554
Noncurrent			2,601				2,495				2,608
		$	7,042			$	7,826			$	8,162
Contract liabilities
Telecommunications business		$	12,772			$	13,602			$	13,144
Project business			10,360				6,687				5,435
Products and service bundling			39				16				4
Others			510				421				491
		$	23,681			$	20,726			$	19,074
Current		$	16,840			$	13,437			$	12,234
Noncurrent			6,841				7,289				6,840
		$	23,681			$	20,726			$	19,074

Summary of Changes in Contract Assets and Contract Liabilities

Significant changes of contract assets and liabilities recognized resulting from product and service bundling were as follows:

		Year Ended December 31
		2019				2020				2021
		NT$				NT$				NT$
		(In Millions)
Contract assets
Net increase of customer contracts		$	6,066			$	5,972			$	6,035
Reclassified to trade receivables			(6,405	)			(5,681	)			(6,039	)
		$	(339	)		$	291			$	(4	)
Contract liabilities
Net increase of customer contracts		$	22			$	7			$	—
Recognized as revenues			(89	)			(30	)			(12	)
		$	(67	)		$	(23	)		$	(12	)

Summary of Revenue Recognized

Revenue recognized for the period that was included in the contract liability at the beginning of the year was as follows:

		Year Ended December 31
		2019				2020				2021
		NT$				NT$				NT$
		(In Millions)
Telecommunications business		$	6,186			$	5,492			$	5,952
Project business			3,973				6,092				4,630
Others			404				512				431
		$	10,563			$	12,096			$	11,013

Summary of Incremental Costs of Obtaining Contracts

c. Incremental costs of obtaining contracts

		December 31
		2020				2021
		NT$				NT$
		(In Millions)
Noncurrent
Incremental costs of obtaining contracts		$	1,000			$	988

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