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Changes in financial assets at fair value through other comprehensive income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | ₩ 399,495 |  | ₩ 0
Effect of change in accounting policy |  | 0 |  | 471,903
Acquisition |  | 1,876 |  | 0
Disposal |  | (19,315) |  | (1)
Valuation |  | (8,019) |  | (75,077)
Impairment |  | 0 |  | 0
Others |  | 5,133 |  | 2,670
Ending Balance |  | 379,170 |  | 399,495
Listed equity securities |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 210,056 |  | 0
Effect of change in accounting policy |  | 0 |  | 274,453
Acquisition |  | 0 |  | 0
Disposal |  | 0 |  | (1)
Valuation |  | (11,734) |  | (63,007)
Impairment |  | 0 |  | 0
Others |  | 2,880 |  | (1,389)
Ending Balance |  | 201,202 |  | 210,056
Unlisted equity securities |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 189,439 | [1] | 0
Effect of change in accounting policy |  | 0 |  | 197,450
Acquisition |  | 1,876 |  | 0
Disposal |  | (19,315) |  | 0
Valuation |  | 3,715 |  | (12,070)
Impairment |  | 0 |  | 0
Others |  | 2,253 |  | 4,059
Ending Balance | [1] | 177,968 |  | 189,439
Current Financial assets at fair value through profit or loss, category |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 0 |  | 0
Effect of change in accounting policy |  | 0 |  | 0
Acquisition |  | 0 |  | 0
Disposal |  | 0 |  | 0
Valuation |  | 0 |  | 0
Impairment |  | 0 |  | 0
Others |  | 0 |  | 0
Ending Balance |  | 0 |  | 0
Non-Current Financial assets at fair value through profit or loss, category |  |  |  |
Changes in financial assets at fair value through other comprehensive income [Line Items] |  |  |  |
Beginning balance |  | 399,495 |  | 0
Effect of change in accounting policy |  | 0 |  | 471,903
Acquisition |  | 1,876 |  | 0
Disposal |  | (19,315) |  | (1)
Valuation |  | (8,019) |  | (75,077)
Impairment |  | 0 |  | 0
Others |  | 5,134 |  | 2,670
Ending Balance |  | ₩ 379,170 |  | ₩ 399,495
[1] | The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.

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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + Details
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