Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of detailed information about intangible assets [abstract]

Summary of Intangible Assets

	December 31
	2021		2022
	NT$		NT$
	(In Millions)
Carrying amount
Mobile Broadband Concession	$	82,820	$	78,150
Computer software		673		622
Goodwill		217		217
Others		235		198
	$	83,945	$	79,187

	Mobile Broadband Concession			Computer Software			Goodwill			Others			Total
	NT$			NT$			NT$			NT$			NT$
	(In Millions)
Cost
Balance on January 1, 2020	$	59,965		$	3,430		$	236		$	378		$	64,009
Additions-acquired separately		48,373			226			—			6			48,605
Disposal		—			(338	)		—			(3	)		(341	)
Effect of foreign exchange differences		—			—			—			—			—
Acquired by business combinations (Note 14)		—			1			55			11			67
Others		—			1			—			—			1
Balance on December 31, 2020	$	108,338		$	3,320		$	291		$	392		$	112,341
Accumulated amortization and impairment
Balance on January 1, 2020	$	(14,293	)	$	(2,499	)	$	(36	)	$	(134	)	$	(16,962	)
Amortization expenses		(5,026	)		(371	)		—			(27	)		(5,424	)
Disposal		—			338			—			1			339
Impairment losses		—			—			(9	)		—			(9	)
Effect of foreign exchange differences		—			—			—			—			—
Acquired by business combinations (Note 14)		—			—			—			—			—
Balance on December 31, 2020	$	(19,319	)	$	(2,532	)	$	(45	)	$	(160	)	$	(22,056	)
Balance on December 31, 2020, net	$	89,019		$	788		$	246		$	232		$	90,285
Cost
Balance on January 1, 2021	$	108,338		$	3,320		$	291		$	392		$	112,341
Additions-acquired separately		—			225			—			31			256
Disposal		—			(344	)		—			(10	)		(354	)
Effect of foreign exchange differences		—			—			—			—			—
Others		—			2			—			—			2
Balance on December 31, 2021	$	108,338		$	3,203		$	291		$	413		$	112,245
Accumulated amortization and impairment
Balance on January 1, 2021	$	(19,319	)	$	(2,532	)	$	(45	)	$	(160	)	$	(22,056	)
Amortization expenses		(6,199	)		(341	)		—			(29	)		(6,569	)
Disposal		—			343			—			11			354
Impairment losses		—			—			(29	)		—			(29	)
Effect of foreign exchange differences		—			—			—			—			—
Others		—			—			—			—			—
Balance on December 31, 2021	$	(25,518	)	$	(2,530	)	$	(74	)	$	(178	)	$	(28,300	)
Balance on December 31, 2021, net	$	82,820		$	673		$	217		$	235		$	83,945
Cost
Balance on January 1, 2022	$	108,338		$	3,203		$	291		$	413		$	112,245
Additions-acquired separately		1,625			257			—			11			1,893
Disposal		—			(663	)		—			(2	)		(665	)
Effect of foreign exchange differences		—			—			—			—			—
Others		—			1			—			—			1
Balance on December 31, 2022	$	109,963		$	2,798		$	291		$	422		$	113,474
Accumulated amortization and impairment
Balance on January 1, 2022	$	(25,518	)	$	(2,530	)	$	(74	)	$	(178	)	$	(28,300	)
Amortization expenses		(6,295	)		(310	)		—			(38	)		(6,643	)
Disposal		—			664			—			1			665
Impairment losses		—			—			—			(9	)		(9	)
Effect of foreign exchange differences		—			—			—			—			—
Others		—			—			—			—			—
Balance on December 31, 2022	$	(31,813	)	$	(2,176	)	$	(74	)	$	(224	)	$	(34,287	)
Balance on December 31, 2022, net	$	78,150		$	622		$	217		$	198		$	79,187