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Investment properties - Summary of changes in investment properties (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Changes in investment property [abstract]
Beginning balance		₩ 327,696	₩ 257,806
Acquisition		80,103	3,582
Disposal		(5,507)	(1,854)
Depreciation		(16,922)	(15,063)	₩ (15,058)
Impairment loss recognized		(694)	0
Amounts transferred from property and equipment		4,829	77,752
Amounts transferred from(to) assets held for sale	[1]	(52,138)	5,551
Effects of foreign currency adjustments		6,279	(78)
Effects of business combinations		267,974	0
Ending balance		₩ 611,620	₩ 327,696	₩ 257,806
[1] Comprise buildings and land, etc.

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The increase in investment property resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Investment property]

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The increase (decrease) in investment property resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Investment property]

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