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Fair Value - Summary of Fair Value Non of Financial Instruments (Detail)
₩ in Millions
Dec. 31, 2018
KRW (₩)
Disclosure of detailed information about financial instruments [line items]  
Non financial assets ₩ 4,052,094
Non financial liabilities 65,066
Level 1 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 8,982
Level 2 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 1,746,915
Non financial liabilities 47,125
Level 3 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 2,296,197
Non financial liabilities 17,941
Financial assets at fair value through other comprehensive income [member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 1,097,348
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 1,097,348
Financial assets at fair value through profit or loss [member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 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 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 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 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 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 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 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 311,536
Derivative financial assets for hedging [member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 29,843
Derivative financial assets for hedging [member] | Level 2 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 29,843
Investment Properties [member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 1,821,061
Investment Properties [member] | Level 3 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial assets 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 7,758
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 7,758
Derivative financial liabilities for hedging [member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial liabilities 57,308
Derivative financial liabilities for hedging [member] | Level 2 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial liabilities 47,125
Derivative financial liabilities for hedging [member] | Level 3 [Member]  
Disclosure of detailed information about financial instruments [line items]  
Non financial liabilities ₩ 10,183