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Financial Instruments - Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk ₩ 31,708,876 ₩ 30,256,184
Cash and cash equivalents [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 7,049,800 6,767,898
Derivative assets [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 662,573 962,876
Short-term financial instruments [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 491,841 1,212,643
Debt securities [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 1,099,767 516,372
Other securities [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 696,148 762,177
Other receivables [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 3,335,169 2,739,523
Trade accounts and notes receivable [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 11,203,682 10,849,267
Deposit instruments [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 7,167,658 ₩ 6,445,428
Classification of assets as held for sale [member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk ₩ 2,238