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Revenue - Contract - Summary of Expected Revenue In Relation To Performance Obligations (Detail) - Infrastructure - construction segment [Member]
₩ in Millions
Dec. 31, 2025
KRW (₩)
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items]  
Expected revenue ₩ 17,820,943
2026 [member]  
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items]  
Expected revenue 7,319,357
2027 [member]  
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items]  
Expected revenue 5,242,014
2028 [member]  
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items]  
Expected revenue 2,928,964
After 2029 [member]  
Disclosure Of Expected Revenue In Relation To Performance Obligations [Line Items]  
Expected revenue ₩ 2,330,608