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Inventories - Summary of Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Inventories [Line Items]    
Raw materials ₩ 4,520,821 ₩ 3,654,341
Merchandise 1,001 512
Work-in-progress 172,014 180,220
Finished goods 52,585 27,254
Supplies 2,814,377 2,537,159
Inventories-in-transit 2,356,444 1,195,148
Other inventories 13,490 13,548
Total Inventories 9,930,732 7,608,182
Acquisition cost    
Inventories [Line Items]    
Raw materials 4,522,171 3,655,588
Merchandise 1,001 512
Work-in-progress 172,089 180,220
Finished goods 52,642 27,254
Supplies 2,814,377 2,541,028
Inventories-in-transit 2,356,444 1,195,148
Other inventories 13,490 13,548
Total Inventories 9,932,214 7,613,298
Valuation allowance    
Inventories [Line Items]    
Raw materials (1,350) (1,247)
Merchandise 0 0
Work-in-progress (75) 0
Finished goods (57) 0
Supplies 0 (3,869)
Inventories-in-transit 0 0
Other inventories 0 0
Total Inventories ₩ (1,482) ₩ (5,116)