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Non-Financial Assets - Summary of Non-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Other Current Assets    
Non-Financial Assets [Line Items]    
Advance payment ₩ 160,596 ₩ 161,466
Prepaid Expenses 366,532 756,729
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 192,005 524,658
Other quick assets 1,025,736 316,138
Miscellaneous Non-Financial Assets 1,217,741 840,796
Non-Financial Assets 1,744,869 1,758,991
Other Noncurrent Assets    
Non-Financial Assets [Line Items]    
Advance payment 51,425 124,305
Prepaid Expenses 153,830 151,095
Miscellaneous Non-Financial Assets    
Greenhouse gas emissions rights 0 0
Other quick assets 103,879 89,418
Miscellaneous Non-Financial Assets 103,879 89,418
Non-Financial Assets ₩ 309,134 ₩ 364,818