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Investments in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) ₩ in Millions, $ in Millions	Jan. 16, 2026 USD ($)	Dec. 31, 2025 KRW (₩)	Dec. 31, 2024 KRW (₩)	Dec. 31, 2023 KRW (₩)
Investments in subsidiaries, joint ventures and associates [abstract]
Investments in associates		₩ 1,844,618	₩ 1,632,386
Investments in joint ventures		3,135,535	3,106,407
Investments in associates and joint ventures	$ 582	₩ 4,980,153	₩ 4,738,793	₩ 5,020,264

X

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of investments in associates in an entity's separate financial statements. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Total for all joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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