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Net Defined Benefit Liabilities (Assets) - Summary of Changes in the Fair Value of Plan Assets (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [Line Items]      
Interest income ₩ (17,462) ₩ 3,139 ₩ 5,047
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [Line Items]      
Beginning 2,478,143 2,314,632  
Interest income 121,336 55,902  
Remeasurements:      
Return on plan assets (excluding amounts included in interest income) 9,410 (8,542)  
Benefits paid (307,762) (287,419)  
Employer contributions 165,128 401,358  
Changes in scope of consolidation, etc. (3,330) 2,212  
Ending ₩ 2,462,925 ₩ 2,478,143 ₩ 2,314,632