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Income Taxes - Income Tax Credit (Charged) Directly to Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current and deferred tax relating to items charged or credited directly to equity [abstract]
Net changes in fair value of equity investments at fair value through other comprehensive income	₩ (129,758)	₩ 41,999	₩ (71,600)
Remeasurements of defined benefit plans	15,475	27,261	34,406
Others	6,390	(14,151)	19,933
Income taxes credited (charged) directly to equity	₩ (107,893)	₩ 55,109	₩ (17,261)

X

- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Classes of financial instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2025-01-01
-Paragraph 81
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 194
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_a&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 194
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_a&doctype=Standard
-URIDate 2025-03-27

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Current and deferred income tax expense relating to remeasurements of defined benefit plans directly charged credited to equity.

+ References

No definition available.

+ Details

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X

- Definition

Income tax relating to changes in fair value of equity investments through other comprehensive income charged to equity.

+ References

No definition available.

+ Details

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X

- Definition

Other tax relating to items credited (charged) directly to equity.

+ References

No definition available.

+ Details

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