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Inventories - Summary of Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Inventories [Line Items]    
Raw materials ₩ 4,912,677 ₩ 4,623,251
Merchandise 1,733 335
Work-in-progress 220,110 187,304
Finished goods 95,760 97,215
Supplies 3,358,831 2,930,978
Inventories-in-transit 1,160,238 1,021,797
Other inventories 19,887 14,735
Total Inventories 9,769,236 8,875,615
Acquisition cost    
Inventories [Line Items]    
Raw materials 4,914,250 4,624,638
Merchandise 1,733 335
Work-in-progress 220,110 187,304
Finished goods 96,390 97,272
Supplies 3,358,831 2,930,978
Inventories-in-transit 1,160,238 1,021,797
Other inventories 19,887 14,735
Total Inventories 9,771,439 8,877,059
Valuation allowance    
Inventories [Line Items]    
Raw materials (1,573) (1,387)
Merchandise 0 0
Work-in-progress 0 0
Finished goods (630) (57)
Supplies 0 0
Inventories-in-transit 0 0
Other inventories 0 0
Total Inventories ₩ (2,203) ₩ (1,444)