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Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2018 ₱ in Thousands, € in Thousands, ₨ in Thousands, ₨ in Thousands, ر.س in Thousands, ¥ in Thousands, R in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	JPY (¥)	USD ($)	PHP (₱)	EUR (€)	INR (₨)	SAR (ر.س)	CAD ($)	NPR (₨)	ZAR (R)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 1,855,000
Exercised amount | ₩	₩ 167,010
Commitments on bank-daylight overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Limited amount | ₩	₩ 280,000
Exercised amount | ₩	₩ 0
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | ₩	₩ 1,050,000
Exercised amount | ₩	₩ 0
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | ₩	₩ 55,904
Exercised amount | ₩	₩ 2,740
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Banco de Oro
Limited amount | ₱				₱ 5,000
Exercised amount | ₱				₱ 5,000
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Limited amount | ₩	₩ 1,238,500
Exercised amount | ₩	₩ 612,197
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank and others
Limited amount			$ 1,840,700
Exercised amount			20,000
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Limited amount			44,680
Exercised amount			4,754
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Limited amount			992,434
Exercised amount			252,392
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | €					€ 4,158
Exercised amount | €					€ 4,158
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount | ₨						₨ 237,321
Exercised amount | ₨						237,321
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Limited amount | ¥		¥ 637,322
Exercised amount | ¥		637,322
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Limited amount | ₩	₩ 89,335
Exercised amount | ₩	₩ 72,802
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Limited amount			923,915
Exercised amount			830,314
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount | ر.س							ر.س 6,508
Exercised amount | ر.س							ر.س 6,508
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Bank of Kathmandu
Limited amount | ₨									₨ 36,304
Exercised amount | ₨									₨ 36,304
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount								$ 617
Exercised amount								$ 617
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount			110,000
Exercised amount			3,199
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | R										R 55,730
Exercised amount | R										R 55,730
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Limited amount			3,934,928
Exercised amount			3,220,418
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | ¥		381,210
Exercised amount | ¥		¥ 381,210
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 307,436
Exercised amount | ₩	₩ 7,088
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Limited amount			1,171,470
Exercised amount			842,897
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | ₨						70,028
Exercised amount | ₨						₨ 70,028
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank
Limited amount | ₩	₩ 258,000
Exercised amount | ₩	₩ 12,278
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	KEB Hana Bank and others
Limited amount			30,930
Exercised amount			18,245
Trade finance [Member]
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	BNP Paribas and others
Limited amount			800,000
Exercised amount			$ 0

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
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