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Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets ₩ 754,992 ₩ 664,726
Ustream Inc. [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Proceeds from the disposal of Subsidiary 59,660 ₩ 49,721
Money Market Wrap and Money Market Trust [member] | Ustream Inc. [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Other financial assets ₩ 870,453