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Financial Instruments - Exposure to Currency Risk (Detail) - Currency risk [member] - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
USD [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Assets ₩ 5,285,433 ₩ 5,441,771
Liabilities 11,385,039 10,927,022
EUR [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Assets 859,737 670,436
Liabilities 691,208 530,728
JPY [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Assets 183,579 303,556
Liabilities 50,754 213,071
Others [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Assets 1,388,889 2,280,424
Liabilities ₩ 296,563 ₩ 367,264