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Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [abstract]    
Present value of defined benefit obligations ₩ 2,427,351 ₩ 2,201,876
Fair value of plan assets (2,069,710) (1,643,046)
Liabilities 365,663 561,269
Assets in the statement of financial position ₩ 8,022 ₩ 2,439