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Derivative Currency swap forward contract List (Details) - 12 months ended Dec. 31, 2020 - Currency forward contracts
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]    
Derivative Counterparty Hana Bank Hana Bank
Contract date Apr. 10, 2014 Apr. 10, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 55,120  
Contract Amount Receive | $   $ 52,000
Contract exchange rate 1,060 1,060
Derivative Counterparty Hana Bank Hana Bank
Contract date Apr. 28, 2014 Apr. 28, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 50,784  
Contract Amount Receive | $   $ 48,000
Contract exchange rate 1,058 1,058
Derivative Counterparty Bank of America Bank of America
Contract date Apr. 29, 2014 Apr. 29, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 105,400  
Contract Amount Receive | $   $ 100,000
Contract exchange rate 1,054 1,054
Derivative Counterparty Hana Bank Hana Bank
Contract date May 09, 2014 May 09, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 104,600  
Contract Amount Receive | $   $ 100,000
Contract exchange rate 1,046 1,046
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 22, 2017 Dec. 22, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 105,079  
Contract Amount Receive | $   $ 100,000
Contract exchange rate 1,050.79 1,050.79
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay | ₩ ₩ 104,849  
Contract Amount Receive | $   $ 100,000
Contract exchange rate 1,048.49 1,048.49
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Nov. 25, 2020 Nov. 25, 2020
Matrurity date Jan. 29, 2021 Jan. 29, 2021
Contract Amount Pay | ₩ ₩ 895  
Contract Amount Receive | $   $ 809
Contract exchange rate 1,106.5 1,106.5
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Jan. 28, 2020 Jan. 28, 2020
Contract Amount Pay | ₩ ₩ 53,371  
Contract Amount Receive | $   $ 48,790
Contract exchange rate 1,093.88 1,093.88
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 29, 2020 Dec. 29, 2020
Matrurity date Jan. 25, 2021 Jan. 25, 2021
Contract Amount Pay | ₩ ₩ 27,776  
Contract Amount Receive | $   $ 25,379
Contract exchange rate 1,094.44 1,094.44
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Oct. 08, 2020 Oct. 08, 2020
Matrurity date Jan. 04, 2021 Jan. 04, 2021
Contract Amount Pay | ₩ ₩ 7,836  
Contract Amount Receive | $   $ 6,771
Contract exchange rate 1,157.15 1,157.15
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Oct. 08, 2020 Oct. 08, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 7,586  
Contract Amount Receive | $   $ 6,552
Contract exchange rate 1,157.75 1,157.75
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Oct. 19, 2020 Oct. 19, 2020
Matrurity date Jan. 18, 2021 Jan. 18, 2021
Contract Amount Pay | ₩ ₩ 10,498  
Contract Amount Receive | $   $ 9,188
Contract exchange rate 1,142.68 1,142.68
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Oct. 21, 2020 Oct. 21, 2020
Matrurity date Jan. 19, 2021 Jan. 19, 2021
Contract Amount Pay | ₩ ₩ 7,633  
Contract Amount Receive | $   $ 6,717
Contract exchange rate 1,136.45 1,136.45
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Nov. 05, 2020 Nov. 05, 2020
Matrurity date Feb. 02, 2021 Feb. 02, 2021
Contract Amount Pay | ₩ ₩ 6,471  
Contract Amount Receive | $   $ 5,729
Contract exchange rate 1,129.45 1,129.45
Derivative Counterparty CCB CCB
Contract date Nov. 30, 2020 Nov. 30, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 5,522  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,104.45 1,104.45
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 09, 2020 Dec. 09, 2020
Matrurity date Jan. 14, 2021 Jan. 14, 2021
Contract Amount Pay | ₩ ₩ 3,248  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,082.8 1,082.8
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 14, 2020 Dec. 14, 2020
Matrurity date Jan. 20, 2021 Jan. 20, 2021
Contract Amount Pay | ₩ ₩ 2,180  
Contract Amount Receive | $   $ 2,000
Contract exchange rate 1,090.05 1,090.05
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 17, 2020 Dec. 17, 2020
Matrurity date Jan. 25, 2021 Jan. 25, 2021
Contract Amount Pay | ₩ ₩ 5,456  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,091.25 1,091.25
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 18, 2020 Dec. 18, 2020
Matrurity date Jan. 28, 2021 Jan. 28, 2021
Contract Amount Pay | ₩ ₩ 5,469  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,093.75 1,093.75
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 23, 2020 Dec. 23, 2020
Matrurity date Feb. 02, 2021 Feb. 02, 2021
Contract Amount Pay | ₩ ₩ 5,540  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,107.95 1,107.95
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 24, 2020 Dec. 24, 2020
Matrurity date Feb. 08, 2021 Feb. 08, 2021
Contract Amount Pay | ₩ ₩ 3,303  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,101.1 1,101.1
Derivative Counterparty Morgan Stanley Morgan Stanley
Contract date Dec. 24, 2020 Dec. 24, 2020
Matrurity date Feb. 09, 2021 Feb. 09, 2021
Contract Amount Pay | ₩ ₩ 5,504  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,100.8 1,100.8
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Feb. 10, 2021 Feb. 10, 2021
Contract Amount Pay | ₩ ₩ 3,296  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,098.5 1,098.5
Derivative Counterparty Credit Agricole Credit Agricole
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Feb. 15, 2021 Feb. 15, 2021
Contract Amount Pay | ₩ ₩ 3,284  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,094.55 1,094.55
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 29, 2020 Dec. 29, 2020
Matrurity date Feb. 17, 2021 Feb. 17, 2021
Contract Amount Pay | ₩ ₩ 6,572  
Contract Amount Receive | $   $ 6,000
Contract exchange rate 1,095.3 1,095.3
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Feb. 19, 2021 Feb. 19, 2021
Contract Amount Pay | ₩ ₩ 5,436  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,087.16 1,087.16
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 15, 2020 Dec. 15, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 1,092  
Contract Amount Receive | $   $ 1,000
Contract exchange rate 1,092.1 1,092.1
Derivative Counterparty HSBC HSBC
Contract date Dec. 23, 2020 Dec. 23, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 3,881  
Contract Amount Receive | $   $ 3,500
Contract exchange rate 1,108.85 1,108.85
Derivative Counterparty HSBC HSBC
Contract date Dec. 24, 2020 Dec. 24, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 3,306  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,101.95 1,101.95
Derivative Counterparty HSBC HSBC
Contract date Dec. 24, 2020 Dec. 24, 2020
Matrurity date Jan. 22, 2021 Jan. 22, 2021
Contract Amount Pay | ₩ ₩ 1,651  
Contract Amount Receive | $   $ 1,500
Contract exchange rate 1,100.8 1,100.8
Derivative Counterparty HSBC HSBC
Contract date Dec. 29, 2020 Dec. 29, 2020
Matrurity date Jan. 13, 2021 Jan. 13, 2021
Contract Amount Pay | ₩ ₩ 14,210  
Contract Amount Receive | $   $ 13,000
Contract exchange rate 1,093.1 1,093.1
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 29, 2020 Dec. 29, 2020
Matrurity date Jan. 05, 2021 Jan. 05, 2021
Contract Amount Pay | ₩ ₩ 6,791  
Contract Amount Receive | $   $ 6,200
Contract exchange rate 1,095.35 1,095.35
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Jan. 22, 2021 Jan. 22, 2021
Contract Amount Pay | ₩ ₩ 9,249  
Contract Amount Receive | $   $ 8,500
Contract exchange rate 1,088.1 1,088.1
Derivative Counterparty MUFG MUFG
Contract date Dec. 29, 2020 Dec. 29, 2020
Matrurity date Jan. 12, 2021 Jan. 12, 2021
Contract Amount Pay | ₩ ₩ 4,380  
Contract Amount Receive | $   $ 4,000
Contract exchange rate 1,095.05 1,095.05
Derivative Counterparty BNP Paribas BNP Paribas
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Jan. 19, 2021 Jan. 19, 2021
Contract Amount Pay | ₩ ₩ 4,351  
Contract Amount Receive | $   $ 4,000
Contract exchange rate 1,087.8 1,087.8
Derivative Counterparty Nova Scotia Nova Scotia
Contract date Sep. 18, 2020 Sep. 18, 2020
Matrurity date Jan. 12, 2021 Jan. 12, 2021
Contract Amount Pay | ₩ ₩ 46,700  
Contract Amount Receive | $   $ 40,000
Contract exchange rate 1,167.45 1,167.45
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Sep. 18, 2020 Sep. 18, 2020
Matrurity date Mar. 11, 2021 Mar. 11, 2021
Contract Amount Pay | ₩ ₩ 15,177  
Contract Amount Receive | $   $ 13,000
Contract exchange rate 1,167.45 1,167.45
Derivative Counterparty HSBC HSBC
Contract date Sep. 18, 2020 Sep. 18, 2020
Matrurity date Jun. 11, 2021 Jun. 11, 2021
Contract Amount Pay | ₩ ₩ 31,506  
Contract Amount Receive | $   $ 27,000
Contract exchange rate 1,166.9 1,166.9
Derivative Counterparty HSBC HSBC
Contract date Oct. 19, 2020 Oct. 19, 2020
Matrurity date Oct. 29, 2024 Oct. 29, 2024
Contract Amount Pay | ₩ ₩ 140,913  
Contract Amount Receive | $   $ 125,000
Contract exchange rate 1,127.3 1,127.3
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 03, 2020 Dec. 03, 2020
Matrurity date Jan. 08, 2021 Jan. 08, 2021
Contract Amount Pay | ₩ ₩ 1,461  
Contract Amount Receive | $   $ 1,330
Contract exchange rate 1,098.7 1,098.7
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 04, 2020 Dec. 04, 2020
Matrurity date Jan. 08, 2021 Jan. 08, 2021
Contract Amount Pay | ₩ ₩ 9,775  
Contract Amount Receive | $   $ 9,000
Contract exchange rate 1,086.15 1,086.15
Derivative Counterparty Credit Agricole Credit Agricole
Contract date Dec. 10, 2020 Dec. 10, 2020
Matrurity date Jan. 08, 2021 Jan. 08, 2021
Contract Amount Pay | ₩ ₩ 3,915  
Contract Amount Receive | $   $ 3,600
Contract exchange rate 1,087.45 1,087.45
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 17, 2020 Dec. 17, 2020
Matrurity date Jan. 15, 2021 Jan. 15, 2021
Contract Amount Pay | ₩ ₩ 4,044  
Contract Amount Receive | $   $ 3,700
Contract exchange rate 1,093.1 1,093.1
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 23, 2020 Dec. 23, 2020
Matrurity date Jan. 21, 2021 Jan. 21, 2021
Contract Amount Pay | ₩ ₩ 3,321  
Contract Amount Receive | $   $ 3,000
Contract exchange rate 1,107.15 1,107.15
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 24, 2020 Dec. 24, 2020
Matrurity date Jan. 21, 2021 Jan. 21, 2021
Contract Amount Pay | ₩ ₩ 5,504  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,100.7 1,100.7
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Jan. 04, 2021 Jan. 04, 2021
Contract Amount Pay | ₩ ₩ 19,076  
Contract Amount Receive | $   $ 17,400
Contract exchange rate 1,096.3 1,096.3
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Jan. 15, 2021 Jan. 15, 2021
Contract Amount Pay | ₩ ₩ 6,577  
Contract Amount Receive | $   $ 6,000
Contract exchange rate 1,096.2 1,096.2
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 28, 2020 Dec. 28, 2020
Matrurity date Jan. 29, 2021 Jan. 29, 2021
Contract Amount Pay | ₩ ₩ 9,870  
Contract Amount Receive | $   $ 9,000
Contract exchange rate 1,096.7 1,096.7
Derivative Counterparty Credit Agricole Credit Agricole
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Jan. 29, 2021 Jan. 29, 2021
Contract Amount Pay | ₩ ₩ 4,915  
Contract Amount Receive | $   $ 4,500
Contract exchange rate 1,092.3 1,092.3
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Jan. 29, 2021 Jan. 29, 2021
Contract Amount Pay | ₩ ₩ 4,344  
Contract Amount Receive | $   $ 4,000
Contract exchange rate 1,086 1,086
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 30, 2020 Dec. 30, 2020
Matrurity date Feb. 05, 2021 Feb. 05, 2021
Contract Amount Pay | ₩ ₩ 8,691  
Contract Amount Receive | $   $ 8,000
Contract exchange rate 1,086.4 1,086.4