XML 122 R110.htm IDEA: XBRL DOCUMENT v3.19.1
Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Valuation gain ₩ 66,305 ₩ 57 ₩ 109,436
Valuation loss 2,045 209,582 138
Other comprehensive income 21,651 (146,508) 85,483
Interest rate swap [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain 192 38  
Valuation loss     148
Other comprehensive income (488) 637 (142)
Currency swap [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain 58,912 19 97,158
Valuation loss 2,045 187,468 (10)
Other comprehensive income 22,139 (146,752) 85,479
Currency forwards [member]      
Disclosure of detailed information about financial instruments [line items]      
Valuation gain ₩ 7,201   12,278
Valuation loss   22,114  
Other comprehensive income   ₩ (393) ₩ 146