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Share Capital - Summary of Share Capital (Detail) - KRW (₩)
₩ / shares in Units, ₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [Line Items]    
Ordinary Shares ₩ 1,564,499 ₩ 1,564,499
Ordinary shares [member]    
Disclosure of classes of share capital [Line Items]    
Number of issued shares 261,111,808 261,111,808
Par value per share ₩ 5,000 ₩ 5,000
Ordinary Shares ₩ 1,564,499 ₩ 1,564,499