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Related Parties - Summary of Derivatives Transactions With Related Parties (Details) - 12 months ended Dec. 31, 2021 - Korea Development Bank SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions | KRW (₩) | USD ($) | HKD ($) | CHF (SFr)
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Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2020~2025 | 2020~2025 | 2020~2025 | 2020~2025
Pay, Contract Amount | ₩ 122,780 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 0.93 | 0.93 | 0.93 | 0.93
Contract Interest rate Receive | 1.75 | 1.75 | 1.75 | 1.75
Contract exchange rate | 1,227.80 | 1,227.80 | 1,227.80 | 1,227.80
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2019~2024 | 2019~2024 | 2019~2024 | 2019~2024
Pay, Contract Amount | ₩ 177,600 |  |  |
Receive, Contract Amount | $ |  | $ 150,000 |  |
Contract Interest rate Pay | 1.24 | 1.24 | 1.24 | 1.24
Contract Interest rate Receive | 2.50 | 2.50 | 2.50 | 2.50
Contract exchange rate | 1,184.00 | 1,184.00 | 1,184.00 | 1,184.00
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2020~2025 | 2020~2025 | 2020~2025 | 2020~2025
Pay, Contract Amount | ₩ 241,320 |  |  |
Receive, Contract Amount | $ |  | $ 200,000 |  |
Contract Interest rate Pay | 0.54 | 0.54 | 0.54 | 0.54
Contract Interest rate Receive | 1.13 | 1.13 | 1.13 | 1.13
Contract exchange rate | 1,206.60 | 1,206.60 | 1,206.60 | 1,206.60
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2021~2026 | 2021~2026 | 2021~2026 | 2021~2026
Pay, Contract Amount | ₩ 118,170 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 1.11 | 1.11 | 1.11 | 1.11
Contract Interest rate Receive | 1.13 | 1.13 | 1.13 | 1.13
Contract exchange rate | 1,181.70 | 1,181.70 | 1,181.70 | 1,181.70
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2015~2025 | 2015~2025 | 2015~2025 | 2015~2025
Pay, Contract Amount | ₩ 111,190 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 2.62 | 2.62 | 2.62 | 2.62
Contract Interest rate Receive | 3.25 | 3.25 | 3.25 | 3.25
Contract exchange rate | 1,111.90 | 1,111.90 | 1,111.90 | 1,111.90
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2017~2027 | 2017~2027 | 2017~2027 | 2017~2027
Pay, Contract Amount | ₩ 111,610 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 2.31 | 2.31 | 2.31 | 2.31
Contract Interest rate Receive | 3.13 | 3.13 | 3.13 | 3.13
Contract exchange rate | 1,116.10 | 1,116.10 | 1,116.10 | 1,116.10
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2018~2028 | 2018~2028 | 2018~2028 | 2018~2028
Pay, Contract Amount | ₩ 108,600 |  |  |
Receive, Contract Amount | $ |  |  | $ 800,000 |
Contract Interest rate Pay | 2.69 | 2.69 | 2.69 | 2.69
Contract Interest rate Receive | 3.35 | 3.35 | 3.35 | 3.35
Contract exchange rate | 135.75 | 135.75 | 135.75 | 135.75
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2018~2023 | 2018~2023 | 2018~2023 | 2018~2023
Pay, Contract Amount | ₩ 170,280 |  |  |
Receive, Contract Amount | $ |  | $ 150,000 |  |
Contract Interest rate Pay | 2.15 | 2.15 | 2.15 | 2.15
Contract Interest rate Receive | 3.75 | 3.75 | 3.75 | 3.75
Contract exchange rate | 1,135.20 | 1,135.20 | 1,135.20 | 1,135.20
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2019~2027 | 2019~2027 | 2019~2027 | 2019~2027
Pay, Contract Amount | ₩ 119,978 |  |  |
Receive, Contract Amount | SFr |  |  |  | SFr 100,000
Contract Interest rate Pay | 1.43 | 1.43 | 1.43 | 1.43
Contract Interest rate Receive | 0.05 | 0.05 | 0.05 | 0.05
Contract exchange rate | 1,199.78 | 1,199.78 | 1,199.78 | 1,199.78
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2021~2026 | 2021~2026 | 2021~2026 | 2021~2026
Pay, Contract Amount | ₩ 111,400 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 0.93 | 0.93 | 0.93 | 0.93
Contract Interest rate Receive | 1.25 | 1.25 | 1.25 | 1.25
Contract exchange rate | 1,114.00 | 1,114.00 | 1,114.00 | 1,114.00
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2020~2026 | 2020~2026 | 2020~2026 | 2020~2026
Pay, Contract Amount | ₩ 118,910 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 0.61 | 0.61 | 0.61 | 0.61
Contract Interest rate Receive | 1.00 | 1.00 | 1.00 | 1.00
Contract exchange rate | 1,189.10 | 1,189.10 | 1,189.10 | 1,189.10
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2019~2022 | 2019~2022 | 2019~2022 | 2019~2022
Pay, Contract Amount | ₩ 112,650 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 1.80 | 1.80 | 1.80 | 1.80
Contract Interest rate Receive | 3.38 | 3.38 | 3.38 | 3.38
Contract exchange rate | 1,126.50 | 1,126.50 | 1,126.50 | 1,126.50
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2021~2026 | 2021~2026 | 2021~2026 | 2021~2026
Pay, Contract Amount | ₩ 114,230 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 1.27 | 1.27 | 1.27 | 1.27
Contract Interest rate Receive | 1.25 | 1.25 | 1.25 | 1.25
Contract exchange rate | 1,142.30 | 1,142.30 | 1,142.30 | 1,142.30
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2018~2023 | 2018~2023 | 2018~2023 | 2018~2023
Pay, Contract Amount | ₩ 320,880 |  |  |
Receive, Contract Amount | $ |  | $ 300,000 |  |
Contract Interest rate Pay | 2.03 | 2.03 | 2.03 | 2.03
Contract Interest rate Receive | 3.75 | 3.75 | 3.75 | 3.75
Contract exchange rate | 1,069.60 | 1,069.60 | 1,069.60 | 1,069.60
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2019~2022 | 2019~2022 | 2019~2022 | 2019~2022
Pay, Contract Amount | ₩ 117,340 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 1.06 | 1.06 | 1.06 | 1.06
Contract Interest rate Receive | 2.38 | 2.38 | 2.38 | 2.38
Contract exchange rate | 1,173.40 | 1,173.40 | 1,173.40 | 1,173.40
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2017~2022 | 2017~2022 | 2017~2022 | 2017~2022
Pay, Contract Amount | ₩ 113,300 |  |  |
Receive, Contract Amount | $ |  | $ 100,000 |  |
Contract Interest rate Pay | 1.94 | 1.94 | 1.94 | 1.94
Contract Interest rate Receive | 2.63 | 2.63 | 2.63 | 2.63
Contract exchange rate | 1,133.00 | 1,133.00 | 1,133.00 | 1,133.00
Cross Currency Interest Rate Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Contract year | 2018~2023 | 2018~2023 | 2018~2023 | 2018~2023
Pay, Contract Amount | ₩ 169,335 |  |  |
Receive, Contract Amount | $ |  | $ 150,000 |  |
Contract Interest rate Pay | 2.26 | 2.26 | 2.26 | 2.26
Contract Interest rate Receive | 3.88 | 3.88 | 3.88 | 3.88
Contract exchange rate | 1,128.90 | 1,128.90 | 1,128.90 | 1,128.90
Cross Currency Forward Contract |  |  |  |
Disclosure of Derivatives transactions between related parties [Line Items] |  |  |  |
Pay, Contract Amount | ₩ 59,049 |  |  |
Receive, Contract Amount | $ |  | $ 50,050 |  |
Contract exchange rate | 1,179.80 | 1,179.80 | 1,179.80 | 1,179.80
Contract date | Sep. 27, 2021 | Sep. 27, 2021 | Sep. 27, 2021 | Sep. 27, 2021
Matrurity date | Jan. 07, 2022 | Jan. 07, 2022 | Jan. 07, 2022 | Jan. 07, 2022

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