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Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Valuation gain ₩ 77,275 ₩ 66,305 ₩ 57
Valuation loss 15,829 2,045 209,582
Other comprehensive income 91,521 21,651 (146,508)
Interest rate swap [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain   192 38
Valuation loss 45    
Other comprehensive income (963) (488) 637
Currency swap [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain 72,417 58,912 19
Valuation loss 15,784 2,045 187,468
Other comprehensive income 87,626 22,139 (146,752)
Currency forwards [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain 4,858 ₩ 7,201  
Valuation loss     22,114
Other comprehensive income ₩ 4,858   ₩ (393)