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Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2020 ₱ in Thousands, € in Thousands, ₨ in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, RM in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	PHP (₱)	JPY (¥)	AED (د.إ)	CAD ($)	INR (₨)	SAR (ر.س)	MYR (RM)	MXN ($)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 1,936,500
Used amount | ₩	₩ 229,960
Commitments on bank-daylight overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit limit | ₩	₩ 280,000
Used amount | ₩	₩ 0
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ₩	₩ 1,150,000
Used amount | ₩	₩ 1,150,000
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 47,104
Used amount | ₩	₩ 5,378
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Banco de Oro
Credit limit | ₱				₱ 5,000
Used amount | ₱				₱ 3,000
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Credit limit | ₩	₩ 1,752,333
Used amount | ₩	₩ 957,924
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank and others
Credit limit		$ 1,809,700
Used amount		55,393
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit limit		8,700
Used amount		7,912
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Credit limit		938,400
Used amount		90,240
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Mizuho Bank
Credit limit											$ 3,666
Used amount											3,666
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Credit limit | ₩	₩ 66,890
Used amount | ₩	₩ 59,677
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Credit limit		1,036,334
Used amount		834,223
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Credit limit | ¥					¥ 637,670
Used amount | ¥					637,670
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | €			€ 4,065
Used amount | €			4,065
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ₨								₨ 6,806
Used amount | ₨								6,806
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit							$ 148
Used amount							$ 148
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Maybank
Credit limit | RM										RM 7,500
Used amount | RM										RM 7,500
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ر.س									ر.س 68,054
Used amount | ر.س									68,054
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit		10,000
Used amount		197
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | €			2
Used amount | €			€ 2
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance
Credit limit | ₩	₩ 40,153
Used amount | ₩	₩ 40,153
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit		550,616
Used amount		498,761
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ر.س									6,508
Used amount | ر.س									ر.س 6,508
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit											20,538
Used amount											20,538
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 654,162
Used amount | ₩	₩ 32,009
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit		2,268,158
Used amount		1,819,226
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ¥					381,210
Used amount | ¥					¥ 381,210
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Standard Chartered
Credit limit | د.إ						د.إ 50
Used amount | د.إ						د.إ 50
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit											6,471
Used amount											$ 4,901
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ₩	₩ 8,000
Used amount | ₩	₩ 927
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit		30,722
Used amount		17,236
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ₨								70,028
Used amount | ₨								₨ 70,028
Trade finance
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	BNP Paribas and others
Credit limit		750,000
Used 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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