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Derivatives - Summary of Derivative Currency Swap Forward Contract List (Details) - 12 months ended Dec. 31, 2023 - Currency forward contracts
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]    
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 08, 2023 Dec. 08, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 41,535  
Contract Amounts Receive | $   $ 29,419
Contract exchange rate 1,411.83 1,411.83
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 13, 2023 Dec. 13, 2023
Maturity date Jan. 03, 2024 Jan. 03, 2024
Contract Amounts Pay | ₩ ₩ 13,131  
Contract Amounts Receive | $   $ 10,000
Contract exchange rate 1,313.1 1,313.1
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 14, 2023 Dec. 14, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 18,126  
Contract Amounts Receive | $   $ 14,000
Contract exchange rate 1,294.7 1,294.7
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 14, 2023 Dec. 14, 2023
Maturity date Jan. 09, 2024 Jan. 09, 2024
Contract Amounts Pay | ₩ ₩ 18,092  
Contract Amounts Receive | $   $ 14,000
Contract exchange rate 1,292.3 1,292.3
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 18, 2023 Dec. 18, 2023
Maturity date Jan. 11, 2024 Jan. 11, 2024
Contract Amounts Pay | ₩ ₩ 6,480  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,295.9 1,295.9
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 20, 2023 Dec. 20, 2023
Maturity date Jan. 15, 2024 Jan. 15, 2024
Contract Amounts Pay | ₩ ₩ 10,383  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,297.9 1,297.9
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 20, 2023 Dec. 20, 2023
Maturity date Jan. 17, 2024 Jan. 17, 2024
Contract Amounts Pay | ₩ ₩ 9,074  
Contract Amounts Receive | $   $ 7,000
Contract exchange rate 1,296.4 1,296.4
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 19, 2024 Jan. 19, 2024
Contract Amounts Pay | ₩ ₩ 16,929  
Contract Amounts Receive | $   $ 13,000
Contract exchange rate 1,302.2 1,302.2
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 12, 2024 Jan. 12, 2024
Contract Amounts Pay | ₩ ₩ 14,329  
Contract Amounts Receive | $   $ 11,000
Contract exchange rate 1,302.6 1,302.6
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 14,324  
Contract Amounts Receive | $   $ 11,000
Contract exchange rate 1,302.2 1,302.2
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 22, 2023 Dec. 22, 2023
Maturity date Jan. 25, 2024 Jan. 25, 2024
Contract Amounts Pay | ₩ ₩ 10,382  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,297.7 1,297.7
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 26, 2023 Dec. 26, 2023
Maturity date Jan. 26, 2024 Jan. 26, 2024
Contract Amounts Pay | ₩ ₩ 10,382  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,297.7 1,297.7
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Jan. 29, 2024 Jan. 29, 2024
Contract Amounts Pay | ₩ ₩ 6,446  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,289.2 1,289.2
Derivative Counterparty Morgan Stanley Morgan Stanley
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Jan. 31, 2024 Jan. 31, 2024
Contract Amounts Pay | ₩ ₩ 14,159  
Contract Amounts Receive | $   $ 11,000
Contract exchange rate 1,287.2 1,287.2
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Feb. 02, 2024 Feb. 02, 2024
Contract Amounts Pay | ₩ ₩ 10,296  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,287 1,287
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Feb. 05, 2024 Feb. 05, 2024
Contract Amounts Pay | ₩ ₩ 10,298  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,287.2 1,287.2
Derivative Counterparty MUFG MUFG
Contract date Nov. 23, 2023 Nov. 23, 2023
Maturity date Feb. 05, 2024 Feb. 05, 2024
Contract Amounts Pay | ₩ ₩ 10,348  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,293.5 1,293.5
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Nov. 30, 2023 Nov. 30, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 5,147  
Contract Amounts Receive | $   $ 4,000
Contract exchange rate 1,286.75 1,286.75
Derivative Counterparty MUFG MUFG
Contract date Nov. 30, 2023 Nov. 30, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 5,147  
Contract Amounts Receive | $   $ 4,000
Contract exchange rate 1,286.65 1,286.65
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 30, 2023 Nov. 30, 2023
Maturity date Feb. 22, 2024 Feb. 22, 2024
Contract Amounts Pay | ₩ ₩ 11,561  
Contract Amounts Receive | $   $ 9,000
Contract exchange rate 1,284.6 1,284.6
Derivative Counterparty Morgan Stanley Morgan Stanley
Contract date Dec. 01, 2023 Dec. 01, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 5,199  
Contract Amounts Receive | $   $ 4,000
Contract exchange rate 1,299.85 1,299.85
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 01, 2023 Dec. 01, 2023
Maturity date Jan. 15, 2024 Jan. 15, 2024
Contract Amounts Pay | ₩ ₩ 14,303  
Contract Amounts Receive | $   $ 11,000
Contract exchange rate 1,300.3 1,300.3
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 01, 2023 Dec. 01, 2023
Maturity date Feb. 14, 2024 Feb. 14, 2024
Contract Amounts Pay | ₩ ₩ 10,386  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,298.25 1,298.25
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 04, 2023 Dec. 04, 2023
Maturity date Feb. 14, 2024 Feb. 14, 2024
Contract Amounts Pay | ₩ ₩ 6,485  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,296.9 1,296.9
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 06, 2023 Dec. 06, 2023
Maturity date Feb. 14, 2024 Feb. 14, 2024
Contract Amounts Pay | ₩ ₩ 5,231  
Contract Amounts Receive | $   $ 4,000
Contract exchange rate 1,307.75 1,307.75
Derivative Counterparty MUFG MUFG
Contract date Dec. 13, 2023 Dec. 13, 2023
Maturity date Feb. 06, 2024 Feb. 06, 2024
Contract Amounts Pay | ₩ ₩ 19,700  
Contract Amounts Receive | $   $ 15,000
Contract exchange rate 1,313.3 1,313.3
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 13, 2023 Dec. 13, 2023
Maturity date Feb. 06, 2024 Feb. 06, 2024
Contract Amounts Pay | ₩ ₩ 17,072  
Contract Amounts Receive | $   $ 13,000
Contract exchange rate 1,313.2 1,313.2
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 15, 2023 Dec. 15, 2023
Maturity date Feb. 06, 2024 Feb. 06, 2024
Contract Amounts Pay | ₩ ₩ 12,916  
Contract Amounts Receive | $   $ 10,000
Contract exchange rate 1,291.55 1,291.55
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 15, 2023 Dec. 15, 2023
Maturity date Feb. 14, 2024 Feb. 14, 2024
Contract Amounts Pay | ₩ ₩ 11,617  
Contract Amounts Receive | $   $ 9,000
Contract exchange rate 1,290.8 1,290.8
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 20, 2023 Dec. 20, 2023
Maturity date Feb. 26, 2024 Feb. 26, 2024
Contract Amounts Pay | ₩ ₩ 5,183  
Contract Amounts Receive | $   $ 4,000
Contract exchange rate 1,295.8 1,295.8
Derivative Counterparty SMBC SMBC
Contract date Dec. 20, 2023 Dec. 20, 2023
Maturity date Mar. 13, 2024 Mar. 13, 2024
Contract Amounts Pay | ₩ ₩ 19,416  
Contract Amounts Receive | $   $ 15,000
Contract exchange rate 1,294.43 1,294.43
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 26,065  
Contract Amounts Receive | $   $ 20,000
Contract exchange rate 1,303.25 1,303.25
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 26,064  
Contract Amounts Receive | $   $ 20,000
Contract exchange rate 1,303.2 1,303.2
Derivative Counterparty MUFG MUFG
Contract date Dec. 21, 2023 Dec. 21, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 27,365  
Contract Amounts Receive | $   $ 21,000
Contract exchange rate 1,303.1 1,303.1
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Jan. 15, 2024 Jan. 15, 2024
Contract Amounts Pay | ₩ ₩ 18,041  
Contract Amounts Receive | $   $ 14,000
Contract exchange rate 1,288.65 1,288.65
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Feb. 26, 2024 Feb. 26, 2024
Contract Amounts Pay | ₩ ₩ 32,146  
Contract Amounts Receive | $   $ 25,000
Contract exchange rate 1,285.85 1,285.85
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Mar. 26, 2024 Mar. 26, 2024
Contract Amounts Pay | ₩ ₩ 8,984  
Contract Amounts Receive | $   $ 7,000
Contract exchange rate 1,283.4 1,283.4
Derivative Counterparty Woori Bank Woori Bank
Contract date Nov. 30, 2023 Nov. 30, 2023
Maturity date Jan. 03, 2024 Jan. 03, 2024
Contract Amounts Pay | ₩ ₩ 6,440  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,287.95 1,287.95
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Nov. 30, 2023 Nov. 30, 2023
Maturity date Jan. 03, 2024 Jan. 03, 2024
Contract Amounts Pay | ₩ ₩ 4,119  
Contract Amounts Receive | $   $ 3,200
Contract exchange rate 1,287.15 1,287.15
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 20, 2023 Dec. 20, 2023
Maturity date Jan. 22, 2024 Jan. 22, 2024
Contract Amounts Pay | ₩ ₩ 6,487  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,297.3 1,297.3
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 27, 2023 Dec. 27, 2023
Maturity date Jan. 29, 2024 Jan. 29, 2024
Contract Amounts Pay | ₩ ₩ 6,466  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,292.2 1,292.2
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Feb. 02, 2024 Feb. 02, 2024
Contract Amounts Pay | ₩ ₩ 6,446  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,289.25 1,289.25
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Feb. 02, 2024 Feb. 02, 2024
Contract Amounts Pay | ₩ ₩ 12,882  
Contract Amounts Receive | $   $ 10,000
Contract exchange rate 1,288.2 1,288.2
Derivative Counterparty HSBC HSBC
Contract date Oct. 19, 2020 Oct. 19, 2020
Maturity date Oct. 29, 2024 Oct. 29, 2024
Contract Amounts Pay | ₩ ₩ 140,913  
Contract Amounts Receive | $   $ 125,000
Contract exchange rate 1,127.3 1,127.3
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 08, 2023 Dec. 08, 2023
Maturity date Jan. 05, 2024 Jan. 05, 2024
Contract Amounts Pay | ₩ ₩ 6,541  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,308.2 1,308.2
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 12, 2023 Dec. 12, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 19,686  
Contract Amounts Receive | $   $ 15,000
Contract exchange rate 1,312.4 1,312.4
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 14, 2023 Dec. 14, 2023
Maturity date Jan. 23, 2024 Jan. 23, 2024
Contract Amounts Pay | ₩ ₩ 10,338  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,292.19 1,292.19
Derivative Counterparty Korea Citi Bank Korea Citi Bank
Contract date Dec. 15, 2023 Dec. 15, 2023
Maturity date Jan. 15, 2024 Jan. 15, 2024
Contract Amounts Pay | ₩ ₩ 6,467  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,293.45 1,293.45
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 18, 2023 Dec. 18, 2023
Maturity date Jan. 15, 2024 Jan. 15, 2024
Contract Amounts Pay | ₩ ₩ 11,668  
Contract Amounts Receive | $   $ 9,000
Contract exchange rate 1,296.45 1,296.45
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 27, 2023 Dec. 27, 2023
Maturity date Jan. 26, 2024 Jan. 26, 2024
Contract Amounts Pay | ₩ ₩ 6,459  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,291.89 1,291.89
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 27, 2023 Dec. 27, 2023
Maturity date Jan. 26, 2024 Jan. 26, 2024
Contract Amounts Pay | ₩ ₩ 6,457  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,291.39 1,291.39
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 02, 2023 Nov. 02, 2023
Maturity date Jan. 26, 2024 Jan. 26, 2024
Contract Amounts Pay | ₩ ₩ 8,406  
Contract Amounts Receive | $   $ 6,286
Contract exchange rate 1,337.2 1,337.2
Derivative Counterparty HSBC HSBC
Contract date Nov. 27, 2023 Nov. 27, 2023
Maturity date Mar. 08, 2024 Mar. 08, 2024
Contract Amounts Pay | ₩ ₩ 6,482  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,296.3 1,296.3
Derivative Counterparty HSBC HSBC
Contract date Nov. 27, 2023 Nov. 27, 2023
Maturity date Mar. 08, 2024 Mar. 08, 2024
Contract Amounts Pay | ₩ ₩ 6,476  
Contract Amounts Receive | $   $ 5,000
Contract exchange rate 1,295.2 1,295.2
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 08, 2023 Dec. 08, 2023
Maturity date Mar. 08, 2024 Mar. 08, 2024
Contract Amounts Pay | ₩ ₩ 13,034  
Contract Amounts Receive | $   $ 10,000
Contract exchange rate 1,303.38 1,303.38
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 15, 2023 Dec. 15, 2023
Maturity date Mar. 08, 2024 Mar. 08, 2024
Contract Amounts Pay | ₩ ₩ 3,865  
Contract Amounts Receive | $   $ 3,000
Contract exchange rate 1,288.22 1,288.22
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Apr. 23, 2024 Apr. 23, 2024
Contract Amounts Pay | ₩ ₩ 2,160  
Contract Amounts Receive | $   $ 1,684
Contract exchange rate 1,282.4 1,282.4
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 28, 2023 Dec. 28, 2023
Maturity date Apr. 23, 2024 Apr. 23, 2024
Contract Amounts Pay | ₩ ₩ 10,253  
Contract Amounts Receive | $   $ 8,000
Contract exchange rate 1,281.65 1,281.65