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Derivatives - Summary of Derivative Currency Swap Forward Contract List (Details) - 12 months ended Dec. 31, 2021 - Currency forward contracts
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]    
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Sep. 27, 2021 Sep. 27, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 59,049  
Contract Amount Receive | $   $ 50,050
Contract exchange rate 1,179.80 1,179.80
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 13, 2021 Dec. 13, 2021
Maturity date Jan. 04, 2022 Jan. 04, 2022
Contract Amount Pay | ₩ ₩ 17,354  
Contract Amount Receive | $   $ 14,720
Contract exchange rate 1,178.95 1,178.95
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 24, 2021 Dec. 24, 2021
Maturity date Jan. 11, 2022 Jan. 11, 2022
Contract Amount Pay | ₩ ₩ 1,185  
Contract Amount Receive | $   $ 1,000
Contract exchange rate 1,185.35 1,185.35
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 06, 2022 Jan. 06, 2022
Contract Amount Pay | ₩ ₩ 11,840  
Contract Amount Receive | $   $ 10,004
Contract exchange rate 1,183.53 1,183.53
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 14, 2022 Jan. 14, 2022
Contract Amount Pay | ₩ ₩ 11,869  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,186.92 1,186.92
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 27, 2021 Dec. 27, 2021
Maturity date Jan. 17, 2022 Jan. 17, 2022
Contract Amount Pay | ₩ ₩ 11,862  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,186.20 1,186.20
Derivative Counterparty Morgan Stanley Morgan Stanley
Contract date Dec. 24, 2021 Dec. 24, 2021
Maturity date Jan. 13, 2022 Jan. 13, 2022
Contract Amount Pay | ₩ ₩ 11,865  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,186.50 1,186.50
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 10, 2021 Dec. 10, 2021
Maturity date Jan. 03, 2022 Jan. 03, 2022
Contract Amount Pay | ₩ ₩ 11,746  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,174.60 1,174.60
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 18, 2022 Jan. 18, 2022
Contract Amount Pay | ₩ ₩ 11,880  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,188.00 1,188.00
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 12, 2022 Jan. 12, 2022
Contract Amount Pay | ₩ ₩ 5,921  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,184.10 1,184.10
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 24, 2021 Dec. 24, 2021
Maturity date Jan. 13, 2022 Jan. 13, 2022
Contract Amount Pay | ₩ ₩ 11,796  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,179.62 1,179.62
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 16, 2021 Dec. 16, 2021
Maturity date Jan. 13, 2022 Jan. 13, 2022
Contract Amount Pay | ₩ ₩ 8,985  
Contract Amount Receive | $   $ 7,590
Contract exchange rate 1,183.90 1,183.90
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 20, 2022 Jan. 20, 2022
Contract Amount Pay | ₩ ₩ 11,870  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,187.00 1,187.00
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 04, 2022 Jan. 04, 2022
Contract Amount Pay | ₩ ₩ 14,243  
Contract Amount Receive | $   $ 12,000
Contract exchange rate 1,186.88 1,186.88
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 04, 2022 Jan. 04, 2022
Contract Amount Pay | ₩ ₩ 6,532  
Contract Amount Receive | $   $ 5,500
Contract exchange rate 1,187.68 1,187.68
Derivative Counterparty HSBC HSBC
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 16,601  
Contract Amount Receive | $   $ 14,000
Contract exchange rate 1,185.77 1,185.77
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 16,601  
Contract Amount Receive | $   $ 14,000
Contract exchange rate 1,185.82 1,185.82
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 10, 2022 Jan. 10, 2022
Contract Amount Pay | ₩ ₩ 11,871  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,187.10 1,187.10
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Jan. 12, 2022 Jan. 12, 2022
Contract Amount Pay | ₩ ₩ 10,690  
Contract Amount Receive | $   $ 9,000
Contract exchange rate 1,187.80 1,187.80
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 03, 2022 Jan. 03, 2022
Contract Amount Pay | ₩ ₩ 5,932  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,186.40 1,186.40
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 03, 2022 Jan. 03, 2022
Contract Amount Pay | ₩ ₩ 4,744  
Contract Amount Receive | $   $ 4,000
Contract exchange rate 1,186.00 1,186.00
Derivative Counterparty HSBC HSBC
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 20, 2022 Jan. 20, 2022
Contract Amount Pay | ₩ ₩ 5,936  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,187.14 1,187.14
Derivative Counterparty HSBC HSBC
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 21, 2022 Jan. 21, 2022
Contract Amount Pay | ₩ ₩ 17,771  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,184.70 1,184.70
Derivative Counterparty MUFG MUFG
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 25, 2022 Jan. 25, 2022
Contract Amount Pay | ₩ ₩ 5,925  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,184.90 1,184.90
Derivative Counterparty HSBC HSBC
Contract date Oct. 19, 2020 Oct. 19, 2020
Maturity date Oct. 29, 2024 Oct. 29, 2024
Contract Amount Pay | ₩ ₩ 140,913  
Contract Amount Receive | $   $ 125,000
Contract exchange rate 1,127.30 1,127.30
Derivative Counterparty HSBC HSBC
Contract date Nov. 30, 2021 Nov. 30, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 5,939  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,187.70 1,187.70
Derivative Counterparty HSBC HSBC
Contract date Nov. 30, 2021 Nov. 30, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 5,934  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,186.70 1,186.70
Derivative Counterparty HSBC HSBC
Contract date Nov. 30, 2021 Nov. 30, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 5,929  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,185.70 1,185.70
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 01, 2021 Dec. 01, 2021
Maturity date Jan. 07, 2022 Jan. 07, 2022
Contract Amount Pay | ₩ ₩ 11,856  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,185.55 1,185.55
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 28, 2022 Jan. 28, 2022
Contract Amount Pay | ₩ ₩ 11,885  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,188.50 1,188.50
Derivative Counterparty MUFG MUFG
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Jan. 28, 2022 Jan. 28, 2022
Contract Amount Pay | ₩ ₩ 11,876  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,187.55 1,187.55
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 30, 2021 Dec. 30, 2021
Maturity date Jan. 28, 2022 Jan. 28, 2022
Contract Amount Pay | ₩ ₩ 11,852  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,185.20 1,185.20
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 23, 2021 Dec. 23, 2021
Maturity date Feb. 18, 2022 Feb. 18, 2022
Contract Amount Pay | ₩ ₩ 8,316  
Contract Amount Receive | $   $ 7,000
Contract exchange rate 1,188.00 1,188.00
Derivative Counterparty HSBC HSBC
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Feb. 18, 2022 Feb. 18, 2022
Contract Amount Pay | ₩ ₩ 11,880  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,188.00 1,188.00
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 24, 2021 Dec. 24, 2021
Maturity date Feb. 25, 2022 Feb. 25, 2022
Contract Amount Pay | ₩ ₩ 5,938  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,187.50 1,187.50
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 24, 2021 Dec. 24, 2021
Maturity date Feb. 25, 2022 Feb. 25, 2022
Contract Amount Pay | ₩ ₩ 5,935  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,186.99 1,186.99
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 29, 2021 Dec. 29, 2021
Maturity date Feb. 25, 2022 Feb. 25, 2022
Contract Amount Pay | ₩ ₩ 11,885  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,188.50 1,188.50
Derivative Counterparty MUFG MUFG
Contract date Dec. 17, 2021 Dec. 17, 2021
Maturity date Mar. 18, 2022 Mar. 18, 2022
Contract Amount Pay | ₩ ₩ 259  
Contract Amount Receive | $   $ 219
Contract exchange rate 1,183.74 1,183.74