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Share-based Payments - Summary of Details of Share-based Payments (Detail)
12 Months Ended
Dec. 31, 2020
KRW (₩)
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Grant date 14th grant June 16, 2020
Vesting conditions Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option ₩ 22,700
Total compensation costs ₩ 5,187,000,000
Employee wage negotiation [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Grant date Employee wage negotiation September 21, 2020
Vesting conditions All employees Current employees as of September 21, 2020
Fair value per option ₩ 22,950
Total compensation costs ₩ 23,317,000,000