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Investment properties - Summary of the fair value of investment property (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
The fair value of investment property [Line Items]
Land and buildings	₩ 1,160,058	₩ 741,547
At fair value [member]
The fair value of investment property [Line Items]
Fair value of investment property when entity applies cost model	1,160,058	741,547
At fair value [member] | Market approach
The fair value of investment property [Line Items]
Fair value of investment property when entity applies cost model	875,056	741,547
At fair value [member] | Income approach
The fair value of investment property [Line Items]
Fair value of investment property when entity applies cost model	₩ 285,002	₩ 0

X

- Definition

The amount of fair value of investment property when an entity applies the cost model to measure the investment property.

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of property, plant and equipment representing land and depreciable buildings and similar structures for use in operations. [Refer: Buildings; Land; Property, plant and equipment]

+ References

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- Definition

The fair value of investment property

+ References

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