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Inventories - Summary of Inventories (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Inventories [Line Items]    
Raw materials ₩ 4,623,251 ₩ 4,520,821
Merchandise 335 1,001
Work-in-progress 187,304 172,014
Finished goods 97,215 52,585
Supplies 2,930,978 2,814,377
Inventories-in-transit 1,021,797 2,356,444
Other inventories 14,735 13,490
Total Inventories 8,875,615 9,930,732
Acquisition cost    
Inventories [Line Items]    
Raw materials 4,624,638 4,522,171
Merchandise 335 1,001
Work-in-progress 187,304 172,089
Finished goods 97,272 52,642
Supplies 2,930,978 2,814,377
Inventories-in-transit 1,021,797 2,356,444
Other inventories 14,735 13,490
Total Inventories 8,877,059 9,932,214
Valuation allowance    
Inventories [Line Items]    
Raw materials (1,387) (1,350)
Merchandise 0 0
Work-in-progress 0 (75)
Finished goods (57) (57)
Supplies 0 0
Inventories-in-transit 0 0
Other inventories 0 0
Total Inventories ₩ (1,444) ₩ (1,482)