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Defined Benefit Liabilities (Assets) - Changes in Plan Assets (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]    
Interest income ₩ 338 ₩ (4,067)
Spin-off   (2,281,910)
Plan assets [member]    
Disclosure of fair value of plan assets [line items]    
Beginning balance 1,040,286 1,127,163
Interest income 32,910 24,550
Remeasurement (18,622) (3,798)
Contributions 215,254 152,208
Benefit paid (83,123) (100,511)
Business combinations 26,618 0
Spin-off 0 (157,522)
Others 684 (1,804)
Ending balance ₩ 1,214,007 ₩ 1,040,286