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Subsidiaries - Less Than Wholly Owned Subsidiaries of the Company That Have Material Noncontrolling Interests (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2022 USD ($)
Disclosure of subsidiaries [Line Items]
Profit attributable to noncontrolling interests	$ 1,511	$ 49	$ 1,431	$ 1,285
Accumulated Noncontrolling Interests	$ 12,408		$ 11,747		$ 404
Senao International Co., Ltd. (SENAO) [Member]
Disclosure of subsidiaries [Line Items]
Place of Incorporation	Taiwan	Taiwan
Principal Place of Business	Taiwan	Taiwan
Proportion of Ownership Interests Held by Noncontrolling Interests	72.00%	72.00%	72.00%
Proportion of Voting Rights Held by Noncontrolling Interests	72.00%	72.00%	72.00%
Profit attributable to noncontrolling interests	$ 462		$ 421	312
Accumulated Noncontrolling Interests	$ 4,454		$ 4,337
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]
Disclosure of subsidiaries [Line Items]
Place of Incorporation	Taiwan	Taiwan
Principal Place of Business	Taiwan	Taiwan
Proportion of Ownership Interests Held by Noncontrolling Interests	66.00%	66.00%	66.00%
Proportion of Voting Rights Held by Noncontrolling Interests	66.00%	66.00%	66.00%
Profit attributable to noncontrolling interests	$ 496		$ 588	$ 604
Accumulated Noncontrolling Interests	5,235		4,933
Individually immaterial subsidiaries with noncontrolling interests [Member]
Disclosure of subsidiaries [Line Items]
Accumulated Noncontrolling Interests	$ 2,719		$ 2,477