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Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2019 ₱ in Thousands, € in Thousands, ₨ in Thousands, ر.ق in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, RM in Thousands, R in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	PHP (₱)	SAR (ر.س)	MYR (RM)	JPY (¥)	INR (₨)	CAD ($)	ZAR (R)	QAR (ر.ق)	AED (د.إ)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 1,825,500
Exercised amount | ₩	₩ 373,219
Commitments on bank-daylight overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 280,000
Exercised amount | ₩	₩ 0
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Limited amount | ₩	₩ 1,250,000
Exercised amount | ₩	₩ 1,150,000
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Limited amount | ₩	₩ 51,904
Exercised amount | ₩	₩ 6,686
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Banco de Oro
Limited amount | ₱				₱ 5,000
Exercised amount | ₱				₱ 3,000
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Limited amount | ₩	₩ 1,050,503
Exercised amount | ₩	₩ 685,429
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank and others
Limited amount | $		$ 2,492,700
Exercised amount | $		14,400
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Limited amount | $		4,680
Exercised amount | $		3,892
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | ₩	₩ 7,749
Exercised amount | ₩	₩ 0
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Limited amount | $		1,051,334
Exercised amount | $		171,975
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Societe Generale
Limited amount | RM						RM 2,500
Exercised amount | RM						RM 2,500
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Limited amount | ₩	₩ 84,011
Exercised amount | ₩	₩ 66,892
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Limited amount | $		596,862
Exercised amount | $		465,093
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Limited amount | ¥							¥ 637,495
Exercised amount | ¥							637,495
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	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	Hana Bank and others
Limited amount | ₨								₨ 191,883
Exercised amount | ₨								191,883
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Limited amount | $									$ 464
Exercised amount | $									$ 464
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | R										R 55,730
Exercised amount | R										R 55,730
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Limited amount | $		10,000
Exercised amount | $		197
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance
Limited amount | ₩	₩ 44,047
Exercised amount | ₩	₩ 44,047
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 | $		714,654
Exercised amount | $		649,402
Advance payment bond, Warranty bond, Retention bond and others3 [Member]
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Limited amount | ر.س					ر.س 86,508
Exercised amount | ر.س					ر.س 86,508
Advance payment bond, Warranty bond, Retention bond and others4 [Member]
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	SMBC Bank
Limited amount | ر.ق											ر.ق 15,000
Exercised amount | ر.ق											ر.ق 15,000
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Limited amount | ₩	₩ 537,064
Exercised amount | ₩	₩ 47,638
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Limited amount | $		1,562,194
Exercised amount | $		1,315,378
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	Standard Chartered
Limited amount | د.إ												د.إ 50
Exercised amount | د.إ												د.إ 50
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Limited amount | ₩	₩ 8,000
Exercised amount | ₩	₩ 772
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Limited amount | $		30,975
Exercised amount | $		17,502
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Limited amount | ₨								92,348
Exercised amount | ₨								₨ 92,348
Trade finance
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	BNP Paribas and others
Limited amount | $		700,000
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=120391452&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=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 944
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-Section S99
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