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Events after Reporting Period - Summary of Public Bonds Issued After Reporting Period (Detail)
₩ in Millions
12 Months Ended
Dec. 31, 2022
KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]  
Interest rate 0.00%
Gross carrying amount [member] | The 198-1st Public bond  
Disclosure of non-adjusting events after reporting period [line items]  
Issue date Jan. 12, 2023
Carrying amount ₩ 70,000
Interest rate 3.847%
Redemption date Jan. 10, 2025
Gross carrying amount [member] | The 198-2nd Public bond  
Disclosure of non-adjusting events after reporting period [line items]  
Issue date Jan. 12, 2023
Carrying amount ₩ 150,000
Interest rate 3.869%
Redemption date Jan. 12, 2026
Gross carrying amount [member] | The 198-3rd Public bond  
Disclosure of non-adjusting events after reporting period [line items]  
Issue date Jan. 12, 2023
Carrying amount ₩ 80,000
Interest rate 3.971%
Redemption date Jan. 12, 2028