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Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Abstract]
Total cash	₩ 132	₩ 119
Demand Deposit Accounts	968,966	1,725,785
Short-term deposits, classified as cash equivalents	559,239	120,594
Short-term investments, classified as cash equivalents	841,402	1,204,855
Total cash and cash equivalents	₩ 2,369,739	₩ 3,051,353	₩ 3,783,065	₩ 1,796,300

X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

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A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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- Definition

The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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