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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, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Other financial assets ₩ 1,617,956 ₩ 1,727,623
Ustream Inc. [member]    
Disclosure of detailed information about financial instruments [line items]    
Proceeds from the disposal of Subsidiary 60,978 ₩ 59,660
Money Market Wrap and Money Market Trust [member] | Ustream Inc. [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets ₩ 610,862