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Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries ₩ (256) [1] ₩ 72 [1] ₩ 0
Fair value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 4 160 0
Consideration received in cash      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 4 160 0
Carrying value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 73 158 0
Cash and Cash Equivalents      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 97 175 0
Trade receivables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 11 0
Other non-financial assets      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 1 0 0
PP&E and intangible assets      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 2 0 0
Trade and other payables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries (3) (28) 0
Other non-financial liabilities      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries (24) 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 (187) 70 0
Other comprehensive income      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries ₩ 0 ₩ 0 ₩ 0
[1] Gain (loss) on disposals of subsidiaries is included in the consolidated statements of comprehensive income (loss).