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Financial Instruments - Changes in Gain or Loss Due to a Hypothetically Strengthening or Weakening in Foreign Currencies (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
10% increase [member] | USD [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ (609,961)   ₩ (548,525)
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%  
10% increase [member] | EUR [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ 16,853   13,971
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%  
10% increase [member] | JPY [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ 13,283   9,049
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%  
10% decrease [member] | USD [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ 609,961   548,525
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%  
10% decrease [member] | EUR [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ (16,853)   (13,971)
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%  
10% decrease [member] | JPY [member]      
Disclosure of detailed information about hedging instruments [line items]      
Changes in gain or loss due to hypothetically strengthens or weakens of functional currency against foreign currencies other than functional currency ₩ (13,283)   ₩ (9,049)
Hypothetical percentage change in functional currency against foreign currencies other than functional currency 10.00% 10.00%