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Financial Risk Management - Additional Information (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2017
KRW (₩)
Disclosure of detailed information about financial instruments [Line items]      
Long-term borrowings   ₩ 2,104,996,000,000 ₩ 252,817,000,000
Bonds   7,466,852,000,000 7,086,187,000,000
Long-term payables - other   1,968,784,000,000 1,346,763,000,000
Maximum credit exposure   6,262,329,000,000 6,227,140,000,000
At cost [member]      
Disclosure of detailed information about financial instruments [Line items]      
Available-for-sale financial assets     199,903,000,000
Floating-rate [member]      
Disclosure of detailed information about financial instruments [Line items]      
Long-term borrowings   239,000,000,000  
Bonds   335,430,000,000  
Long-term payables - other   2,476,738,000,000  
Floating-rate [member] | One Percentage Increase Decrease In Interest Rates [member] | Scenario Forecast1 [member]      
Disclosure of detailed information about financial instruments [Line items]      
Hypothetical increase (decrease) in interest rate, effect on income before income taxes | $ $ 1,400    
Interest rate risk [member] | Long-term payables - other [member]      
Disclosure of detailed information about financial instruments [Line items]      
Hypothetical increase (decrease) in interest rate, effect on income before income taxes   ₩ 24,767,000,000  
Hypothetical increase (decrease) in interest rate   1.00%  
Financial instruments [member]      
Disclosure of detailed information about financial instruments [Line items]      
Maximum credit exposure   ₩ 1,046,897,000,000 618,002,000,000
Available- for-sale financial assets [Member]      
Disclosure of detailed information about financial instruments [Line items]      
Maximum credit exposure   11,672,000,000 19,928,000,000
Loans and receivables [member]      
Disclosure of detailed information about financial instruments [Line items]      
Maximum credit exposure   1,621,938,000,000 1,962,083,000,000
Cash and cash equivalents [Member]      
Disclosure of detailed information about financial instruments [Line items]      
Maximum credit exposure   ₩ 1,506,432,000,000 ₩ 1,457,416,000,000