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Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail)
₩ in Millions
Dec. 31, 2019
KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits ₩ 5,198,228
Less than 1 year [member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 241,380
Between 1-2 years [member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 273,477
Between 2-5 years [member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits 834,025
More than 5 years [member]  
Disclosure of net defined benefit liability (asset) [Line Items]  
Pension benefits ₩ 3,849,346