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Employee Benefits - Summary of amount recognizedi n relation to net defined benefit asset liabilities in statement of financial position explanatory (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of defined benefit plans [abstract]
Present value of funded obligations	₩ 2,631,811	₩ 2,589,246
Fair value of plan assets	(2,923,780)	(2,962,342)
Present value of non-funded obligations	(4,954)	7,092
Net defined benefit assets	₩ (296,923)	₩ (366,004)

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- References

No definition available.

+ Details

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2025-03-27

+ Details

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- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

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- Definition

Funded defined benefit obligation at present value.

+ References

No definition available.

+ Details

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- Definition

Unfunded defined benefit obligation at present value.

+ References

No definition available.

+ Details

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