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Lease - Summary of Details of Finance Lease Assets (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of recognised finance lease as assets by lessee [Line Items]    
Finance lease assets ₩ 199,884 ₩ 193,618
Gross carrying amount [member]    
Disclosure of recognised finance lease as assets by lessee [Line Items]    
Finance lease assets 325,975 298,631
Accumulated Depreciation and Amortisation [Member]    
Disclosure of recognised finance lease as assets by lessee [Line Items]    
Finance lease assets ₩ (126,091) ₩ (105,013)