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Details of shares issued (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Common shares [Line Items] |  |  |
Common shares |  | ₩ 3,209,820 | ₩ 3,209,820
Owned by government |  |  |
Common shares [Line Items] |  |  |
Common shares | [1] | 1,640,385 | 1,640,385
Owned by others |  |  |
Common shares [Line Items] |  |  |
Common shares |  | ₩ 1,569,435 | ₩ 1,569,435
[1] | Korea Development Bank's interest of KRW1,056,176 million is included.

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