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Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Non financial assets ₩ 4,809,091 ₩ 4,052,094
Non financial liabilities 20,134 65,066
Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 6,970 8,982
Non financial liabilities 0  
Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,942,555 1,746,915
Non financial liabilities 20,134 47,125
Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 2,859,566 2,296,197
Non financial liabilities 0 17,941
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,256,266 1,097,348
Financial assets at fair value through other comprehensive income [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0  
Financial assets at fair value through other comprehensive income [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,256,266 1,097,348
Financial assets at fair value through other comprehensive income [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0  
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 632,324 777,685
Financial assets at fair value through profit or loss [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 232 121
Financial assets at fair value through profit or loss [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 136,951 613,964
Financial assets at fair value through profit or loss [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 495,141 163,600
Other financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 557,342 326,157
Other financial assets at fair value through other comprehensive income [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 6,738 8,861
Other financial assets at fair value through other comprehensive income [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 508,550 5,760
Other financial assets at fair value through other comprehensive income [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 42,054 311,536
Derivative financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 58,576 29,843
Derivative financial assets for hedging [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0  
Derivative financial assets for hedging [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 40,788 29,843
Derivative financial assets for hedging [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 17,788  
Investment Properties [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 2,304,583 1,821,061
Investment Properties [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0  
Investment Properties [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0  
Investment Properties [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 2,304,583 1,821,061
Other financial liabilities at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 38 7,758
Other financial liabilities at fair value through profit or loss [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 0  
Other financial liabilities at fair value through profit or loss [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 38  
Other financial liabilities at fair value through profit or loss [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 0 7,758
Derivative financial liabilities for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 20,096 57,308
Derivative financial liabilities for hedging [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 0  
Derivative financial liabilities for hedging [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 20,096 47,125
Derivative financial liabilities for hedging [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities ₩ 0 ₩ 10,183