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Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [abstract]    
Present value of defined benefit obligations ₩ 1,911,166 ₩ 1,713,184
Fair value of plan assets (1,519,779) (1,334,780)
Liabilities 395,079 ₩ 378,404
Assets in the statement of financial position ₩ 3,692