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Financial Assets at Amortized Cost (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	₩ 13,149	₩ 12,302
Non-current financial assets at amortized costs	1,273	1,307
Financial assets at amortized costs	14,422	13,609
Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	13,149	12,302
Non-current financial assets at amortized costs	1,273	1,307
Financial assets at amortized costs	14,422	13,609
Government grants
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Government bonds
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,422	1,609
Government bonds | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,422	1,609
Government bonds | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Government bonds | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	13,000	12,000
Others | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	13,000	12,000
Others | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	₩ 0	₩ 0

X

- Definition

The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_f&doctype=Standard
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- Definition

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_f&doctype=Standard
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- Definition

The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
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