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Investment Properties - Summary of Income and Expenses Related to Investment Properties (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Rental income from investment property, net of direct operating expense [abstract]    
Rental income ₩ 10,118 ₩ 8,335
Operating and maintenance expenses related to rental income (1,386) (1,453)
Rental income from investment property, net of direct operating expense ₩ 8,732 ₩ 6,882