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Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 5,107,863
Less than 1 year [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	183,106
Between 1-2 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	225,706
Between 2-5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	726,283
More than 5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 3,972,768