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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk ₩ 10,070,273 ₩ 9,975,310
Cash equivalents(except cash on hand) [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 1,926,620 2,875,383
Trade and other receivables [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 6,643,115 6,036,363
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 5,813 6,277
Derivative used for hedging [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 7,389 227,318
Time deposits and others [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 1,333,317 716,769
Available-for-sale [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 9,899 26,684
Held-to-maturity financial assets [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 151 30,143
Financial guarantee contracts [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk ₩ 143,969 ₩ 56,373