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Borrowings - Summary of Long-term Borrowings (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
KRW (₩)
Dec. 31, 2020
SGD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
KRW (₩)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 0.00% 0.00% 0.00%    
Borrowings ₩ 7,316,298 $ 284,000,000 $ 519,598,989 ₩ 7,298,867  
Total 5,898,184     6,113,142  
Shinhan Bank [member] | Facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings     25,918,000 30,008 $ 25,918,000
Shinhan Bank [member] | Kookmin Bank and other [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings | $         87,940,000
NongHyup Bank [member] | Facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings       79  
Other Financial Instruments [member] | Kookmin Bank and other [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings     $ 48,855,000 950  
Long-term borrowings [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings 272,263     190,780  
Less: Current portion (94,042)     (50,192)  
Total 178,221     140,588  
Long-term borrowings [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 30,000     30,000  
Long-term borrowings [member] | Export-Import Bank of Korea [member] | Inter-Korean Cooperation Fund [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 1.50% 1.50% 1.50%    
Borrowings ₩ 2,961     3,454  
Long-term borrowings [member] | Industrial Bank of Korea [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 2.98% 2.98% 2.98%    
Borrowings ₩ 6,000     6,000  
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 1.94% 1.94% 1.94%    
Borrowings ₩ 5,000     5,000  
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 1 [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates description LIBOR(3M)+1.650        
Annual interest rates adjustment rate 1.65% 1.65% 1.65%    
Borrowings ₩ 9,694   $ 8,910,000 3,473 $ 3,000,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates description LIBOR(3M)+2.130        
Annual interest rates adjustment rate 2.13% 2.13% 2.13%    
Borrowings ₩ 27,200   $ 25,000,000    
Long-term borrowings [member] | Shinhan Bank [member] | Facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates description LIBOR(3M)+1.340        
Annual interest rates adjustment rate 1.34% 1.34% 1.34%    
Borrowings ₩ 28,199        
Long-term borrowings [member] | CA-CIB [member] | Long-term CP [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 1.26% 1.26% 1.26%    
Borrowings ₩ 100,000        
Long-term borrowings [member] | NongHyup Bank [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 54        
Long-term borrowings [member] | NongHyup Bank [member] | Facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 2.00% 2.00% 2.00%    
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 3.02% 3.02% 3.02%    
Borrowings ₩ 10,000     10,000  
Long-term borrowings [member] | Korea Development Bank [member] | General Loans 1 [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 3.31% 3.31% 3.31%    
Long-term borrowings [member] | Other Financial Instruments [member] | Redeemable convertible preferred stock [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 53,155     ₩ 101,816  
Long-term borrowings [member] | Other Financial Instruments [member] | Kookmin Bank and other [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates description LIBOR(3M)+1.850        
Annual interest rates adjustment rate 1.85% 1.85% 1.85%