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Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries [1] ₩ 72 ₩ 0 ₩ 0
Fair value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 160 0 35,046
Consideration received in cash      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 160 0 898
Net assets transferred due to dissolution      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 0 34,148
Carrying value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 158 0 35,046
Cash and Cash Equivalents      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 175 0 898
Total current financial assets      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 0 81
Trade receivables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 11 0 0
Financial assets available-for-sale      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 0 34,089
Current financial liabilities      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 0 (22)
Trade and other payables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries (28) 0 0
Non-controlling interests      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 0 0
Realization of unrealized gain      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 70 0 0
Other comprehensive income      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries ₩ 0 ₩ 0 ₩ 0
[1] Gain from disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss).