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Additional Information of Statement of Cash Flows - Summary Of Material Non Cash Transactions Explanatory (Detail) - KRW (₩) ₩ in Millions		12 Months Ended
	Feb. 19, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
TextBlock 1 [Abstract]
Transfer of construction-in-progress to property, plant and equipment and intangible assets		₩ 4,816,462	₩ 7,193,949	₩ 3,782,059
Changes in accounts payable related to acquisition of property, plant and equipment and intangible assets		214,488	(181,188)	(113,447)
Retirement of treasury shares	₩ 635,100	374,546	431,107
Other material non-cash items		₩ 5,405,496	₩ 7,443,868	₩ 3,668,612

X

- Definition

The amount of treasury stock cancelled during the period. [Refer: Treasury shares]

+ 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 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

The increase (decrease) in property, plant and equipment including right-of-use assets resulting from transfers from construction in progress. [Refer: Property, plant and equipment including right-of-use assets; Construction in progress]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 16
-IssueDate 2025-01-01
-Paragraph 73
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

The amount of material non-cash items other than depreciation and amortisation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 28
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_e&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 23
-Subparagraph i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_i&doctype=Standard
-URIDate 2025-03-27

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- Definition

Changes in accounts payable related to acquisition of property, plant and equipment and intangible assets.

+ References

No definition available.

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TextBlock 1.

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