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Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
gain (loss) of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries [1] ₩ (6,610) ₩ (256) ₩ 72
Fair value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 1,473 4 160
Consideration received in cash      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 389 4 160
Net assets transferred due to liquidation      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 1,084 0 0
Carrying value of Disposaled subsidiaries      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 7,827 73 158
Cash and Cash Equivalents      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 1,656 97 175
Trade receivables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 395 0 11
Inventories      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 2,801 0 0
Other non-financial assets      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 98 1 0
PP&E and intangible assets      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 3,812 2 0
Trade and other payables      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries (935) (3) (28)
Other non-financial liabilities      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 (24) 0
Realization of unrealized gain      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries 0 (187) 70
Other comprehensive income (loss) (cumulative foreign currency translation of foreign operations)      
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]      
gain (loss) of Disposaled subsidiaries ₩ 256 ₩ 0 ₩ 0
[1] Gain (loss) on disposals of subsidiaries is included in the 'Gain (loss) on disposal of investments in subsidiaries' the consolidated statements of comprehensive income (loss).