Equity - Appropriations of Earnings (Detail) - TWD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash dividends [Member]
Appropriations of earnings	$ 36,476	$ 35,746	$ 33,404
Cash dividends per share	$ 4.702	$ 4.608	$ 4.306
Special reserve [Member]
Appropriations of earnings		$ 408
Reversal of Special Reserve [Member]
Appropriations of earnings	$ 185

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 137
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_137_a&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration