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Inventories - Summary of Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Inventories [Line Items]    
Raw materials ₩ 3,654,341 ₩ 3,601,188
Merchandise 512 234
Work-in-progress 180,220 148,067
Finished goods 27,254 42,070
Supplies 2,537,159 2,272,790
Inventories in transit 1,195,148 666,967
Other inventories 13,548 11,593
Total Inventories 7,608,182 6,742,909
Acquisition cost    
Inventories [Line Items]    
Raw materials 3,655,588 3,602,073
Merchandise 512 234
Work-in-progress 180,220 148,067
Finished goods 27,254 42,070
Supplies 2,541,028 2,280,682
Inventories in transit 1,195,148 666,967
Total Inventories 7,613,298 6,751,686
Valuation allowance    
Inventories [Line Items]    
Raw materials (1,247) (885)
Merchandise 0 0
Work-in-progress 0 0
Finished goods 0 0
Supplies (3,869) (7,892)
Inventories in transit 0 0
Other inventories 0 0
Total Inventories ₩ (5,116) ₩ (8,777)