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Investment Properties - Summary of Investment Properties Provided as Collateral (Detail) - Land and buildings [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deposits 1 [member]    
Disclosure of detailed information about investment property [line items]    
Carrying amount ₩ 790,414 ₩ 854,874
Secured amount ₩ 62,968 ₩ 62,896
Related account Deposits Deposits
Related amount ₩ 56,247 ₩ 56,831
Borrowings [member]    
Disclosure of detailed information about investment property [line items]    
Carrying amount 2,861 1,915
Secured amount ₩ 3,434 ₩ 3,044
Related account Borrowings Borrowings
Related amount ₩ 2,928 ₩ 1,903