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Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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).

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