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Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Non financial assets ₩ 4,840,220 ₩ 4,809,091
Non financial liabilities 130,611 20,134
Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 52,055 6,970
Non financial liabilities 0  
Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,659,385 1,942,555
Non financial liabilities 123,780 20,134
Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 3,128,780 2,859,566
Non financial liabilities 6,831 0
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,118,619 1,256,266
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 1,118,619 1,256,266
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 809,919 632,324
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 46,449 232
Non financial liabilities 0  
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 330,961 136,951
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 432,509 495,141
Non financial liabilities   0
Other financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 258,516 557,342
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 5,606 6,738
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 202,121 508,550
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 50,789 42,054
Derivative financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 7,684 58,576
Derivative financial assets for hedging [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 7,684 40,788
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 2,645,482 2,304,583
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 2,645,482 2,304,583
Other financial liabilities at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 2,682 38
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 45 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 2,637  
Derivative financial liabilities for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 127,929 20,096
Derivative financial liabilities for hedging [member] | Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets   0
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 123,735 20,096
Derivative financial liabilities for hedging [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities ₩ 4,194 ₩ 0