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Deferred Revenues (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred income including contract liabilities [abstract]    
Deferred Revenue, Beginning Balance ₩ 9,868,189 ₩ 9,201,538
Increase 1,149,578 1,310,128
Recognized as revenue (661,212) (643,477)
Deferred Revenue, Ending Balance ₩ 10,356,555 ₩ 9,868,189