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Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Non financial assets ₩ 8,171,407 ₩ 8,263,049
Non financial liabilities 10,140,198 9,580,827
Level 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,244,847 1,032,547
Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 437,533 750,144
Non financial liabilities 10,005,637 9,439,547
Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 6,489,027 6,480,358
Non financial liabilities 134,561 141,280
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 116,198 129,124
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 116,198 129,124
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 939,661 1,064,856
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 13,911 26,647
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 156,918 426,140
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 768,832 612,069
Other financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 1,680,168 1,508,192
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 1,230,936 1,005,900
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 5,206 5,163
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 444,026 497,129
Derivative financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 159,211 190,830
Derivative financial assets for hedging [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 159,211 189,717
Derivative financial assets for hedging [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 0 1,113
Investment Properties [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 5,276,169 5,370,047
Investment Properties [member] | Level 3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial assets 5,276,169 5,370,047
Borrowings [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 9,979,545 9,405,992
Borrowings [Member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 9,979,545 9,405,992
Other financial liabilities at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 136,106 141,280
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 1,545 0
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 134,561 141,280
Derivative financial liabilities for hedging purpose [member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities 24,547 33,555
Derivative financial liabilities for hedging purpose [member] | Level 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Non financial liabilities ₩ 24,547 ₩ 33,555