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Leases - Summary of Details of Future Minimum Lease Payments under Finance Lease Contracts (Detail)
₩ in Millions
Dec. 31, 2018
KRW (₩)
Disclosure of finance lease and operating lease by lessee [Line Items]  
Total amount of minimum lease payments ₩ 202,192
Unrealized interest expense 38,334
Net amount of minimum lease payments 163,858
Less than 1 year [member]  
Disclosure of finance lease and operating lease by lessee [Line Items]  
Total amount of minimum lease payments 77,615
Net amount of minimum lease payments 59,324
1-5 years [member]  
Disclosure of finance lease and operating lease by lessee [Line Items]  
Total amount of minimum lease payments 124,498
Net amount of minimum lease payments 104,456
More than 5 years [member]  
Disclosure of finance lease and operating lease by lessee [Line Items]  
Total amount of minimum lease payments 79
Net amount of minimum lease payments ₩ 78