v3.26.1
Defined Benefit Liabilities (Assets) - Changes in Plan Assets (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value of plan assets [line items]    
Interest income ₩ 4,366 ₩ 6,752
Plan assets [member]    
Disclosure of fair value of plan assets [line items]    
Beginning balance 1,294,567 1,292,416
Interest income 46,765 54,215
Remeasurement 1,406 729
Contributions 182,076 124,921
Benefit paid (264,521) (131,031)
Changes in consolidation scope 0 (2,151)
Others (3,308) (44,532)
Ending balance ₩ 1,256,985 ₩ 1,294,567