Investment properties - Changes in investment properties (Details) $ in Thousands, ₩ in Millions	12 Months Ended
Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2020 KRW (₩)
Reconciliation of changes in investment property [abstract]
Beginning balance	₩ 389,495		₩ 387,464	₩ 280,239
Changes in investment property [abstract]
Acquisition	0		0	76,588
Disposal	(1,206)		0	(353)
Depreciation	(3,925)		(2,809)	(2,689)
Transfer	7,153		6,095	30,431
Foreign currencies translation adjustments	(3,810)		(1,255)	267
Business combination	0		0	10,557
Others	0		0	(7,576)
Ending balance	₩ 387,707	$ 307,655	₩ 389,495	₩ 387,464

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

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The amount of additions to investment property resulting from acquisitions. [Refer: Investment property]

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The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property]

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The decrease in investment property resulting from disposals. [Refer: 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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The increase (decrease) in investment property resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Investment property]

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The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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The amount transferred from investment property under construction or development to completed investment property. [Refer: Investment property]

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