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Finance Expenses - Summary of Finance Expenses and Interest Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest costs [abstract]      
Trade and other payables ₩ 213,765 ₩ 88,757 ₩ 94,019
Short-term borrowings 42,371 29,358 42,971
Long-term borrowings 115,141 118,678 119,806
Debt securities 1,728,588 1,805,253 1,827,511
Other financial liabilities 384,423 540,867 558,464
Interest expense (before capitalizing borrowing costs) 2,484,288 2,582,913 2,642,771
Less: Capitalized borrowing costs (569,831) (587,488) (595,960)
Interest expense 1,914,457 1,995,425 2,046,811
Losses on sale of financial assets 1,045 648 2,106
Losses on valuation of financial assets at fair value through profit or loss 5,480 7,396 4,513
Losses on valuation of derivatives 37,017 513,278 45,385
Losses on transaction of derivatives 40,818 81,055 71,546
Losses on foreign currency translation 83,558 215,047 553,731
Losses on foreign currency transaction 1,159,334 79,103 55,509
Losses on repayment of financial liabilities 10 35 0
Others 4,058 4,456 2,555
Total Finance Expense ₩ 3,245,777 ₩ 2,896,443 ₩ 2,782,156