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Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail)
₩ in Millions
Dec. 31, 2017
KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits ₩ 4,713,478
Less than 1 year [member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 142,963
Between 1-2 years [Member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 179,612
Between 2-5 years [Member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 627,302
More than 5 years [Member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits ₩ 3,763,601