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Risk Management - Summary of Interest Rate Risk (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial instruments by type of interest rate [line items] |  |
Short-term borrowings | ₩ 4,382,218 | ₩ 2,113,181
Long-term borrowings | 2,265,624 | 3,003,999
Total | 80,529,513 | 69,724,581
Floating interest rate [member] |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Short-term borrowings | 391,897 | 171,518
Long-term borrowings | 2,405,244 | 2,191,322
Debt securities | 257,667 | 250,968
Total | ₩ 3,054,808 | ₩ 2,613,808

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