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Commitments and Contingencies - Summary of Primary Payment Guarantees that the Company Provided from the Guarantee Institution (Detail)
₩ in Millions
Dec. 31, 2025
KRW (₩)
Disclosure of contingent liabilities [line items]  
Agreed amount ₩ 2,486,755
Executed amount 1,395,830
Payment guarantees provided from the guarantee institution [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 14,579,116
Executed amount 12,606,242
Payment guarantees provided from the guarantee institution [member] | Construction Guarantee Cooperative [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 5,255,953
Executed amount 5,255,953
Payment guarantees provided from the guarantee institution [member] | Engineering guarantee insurance [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 913,756
Executed amount 700,662
Payment guarantees provided from the guarantee institution [member] | Seoul Guarantee Insurance [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 517,441
Executed amount 517,441
Payment guarantees provided from the guarantee institution [member] | Korea Housing & Urban Guarantee Corporation [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 5,711,921
Executed amount 5,038,742
Payment guarantees provided from the guarantee institution [member] | Woori Bank and others [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 1,953,945
Executed amount 897,193
Payment guarantees provided from the guarantee institution [member] | Korea software financial cooperative [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 120,173
Executed amount 114,611
Payment guarantees provided from the guarantee institution [member] | Seoul guarantee insurance two [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 80,249
Executed amount 80,249
Payment guarantees provided from the guarantee institution [member] | Construction guarantee cooperative one [member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 24,482
Executed amount 195
Payment guarantees provided from the guarantee institution [member] | CI Guarantee [Member]  
Disclosure of contingent liabilities [line items]  
Agreed amount 1,196
Executed amount ₩ 1,196