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Interest rate risk (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial instruments by type of interest rate [Line Items] |  |
Short-term borrowings | ₩ 2,113,181 | ₩ 1,315,134
Long-term borrowings | 3,003,999 | 3,389,743
Total | 69,724,581 | 67,876,541
Floating interest rate [Member] |  |
Disclosure of financial instruments by type of interest rate [Line Items] |  |
Short-term borrowings | 171,518 | 0
Long-term borrowings | 2,191,322 | 2,273,579
Debt securities | 250,968 | 243,102
Total | ₩ 2,613,808 | ₩ 2,516,681

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