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Leases - Summary of Details of Future Minimum Lease Payments under Operating Lease Contracts (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of finance lease and operating lease by lessee [Line Items]    
Net amount of minimum lease payments ₩ 279,792 ₩ 705,182
Less than 1 year [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Net amount of minimum lease payments 100,443 287,149
1-5 years [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Net amount of minimum lease payments 120,939 389,057
More than 5 years [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Net amount of minimum lease payments ₩ 58,410 ₩ 28,976