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Fair value measurement of liabilities (Details) - At fair value - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 312,163	₩ 428,059
Level 2
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	310,008	428,059
Level 3
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 2,155	₩ 0

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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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