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Borrowings - Summary of Borrowings (Parenthetical) (Detail)
₩ in Millions
Dec. 31, 2020
KRW (₩)
Dec. 31, 2020
SGD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
KRW (₩)
Disclosure of detailed information about borrowings [line items]        
Borrowings ₩ 7,316,298 $ 284,000,000 $ 519,598,989 ₩ 7,298,867
Libor rate 0.238% 0.238% 0.238%  
SOR rate 0.185% 0.185% 0.185%  
Medium Term Note Programme [member] | Fixed interest rate [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 100,000,000  
Medium Term Note Programme [member] | Top of range [member] | Fixed interest rate [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 2,000,000,000