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Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Interest income ₩ 271,925 ₩ 273,460 ₩ 270,571
Interest expense (293,854) (263,389) (263,579)
Total (353,980) 215,095 (38,610)
Other comprehensive income (loss) for the year (2,194) 165,567 23,255
Reclassified to profit or loss from other comprehensive income (loss) for the year (95,421) (136,583)  
Interest expense (41,469) (36,651) (44,091)
Financial liabilities designated as at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (4,046)    
Gain (loss) foreign currency transaction 24 (2)  
Gain (loss) on disposal   2,136 799
Gain (loss) on valuation 30,031 42,447 119
Derivatives used for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on transactions (1,291) (6,208) 1,141
Gain (loss) on valuation (17,237) (7,206) (161,003)
Other comprehensive income (loss) for the year (23,957) (3,112) (81,671)
Reclassified to profit or loss from other comprehensive income (loss) for the year 15,195 6,722 107,786
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (275,302) (232,197) (220,945)
Gain (loss) foreign currency transaction (34,574) (3,580) (10,717)
Gain (loss) on foreign currency translation (168,577) (201,623) 141,849
Lease liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (41,469) (36,650) (44,091)
Financial assets at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 144,505 74,937 55,742
Gain (loss) foreign currency transaction 23,824 12,826 (19,244)
Gain (loss) on foreign currency translation (2,151) 2,911 (3,895)
Gain (loss) on disposal (81) 35 138
Gain (loss) on valuation (132,102) (110,286) (140,474)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 6,008 3,673 6,548
Dividend income 4,600 21,499 4,379
Gain (loss) foreign currency transaction 13,711 17,794  
Gain (loss) on foreign currency translation 1,100   (38)
Gain (loss) on disposal 2,347 29,974 (329)
Gain (loss) on valuation (29,282) 64,659 59,044
Financial assets at fair value through other comprehensive income [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 190,281 222,290 227,736
Dividend income 9,522 1,365 56
Gain (loss) on disposal (62,183) (22,712) (8,152)
Gain (loss) on valuation (61)    
Other comprehensive income (loss) for the year (158,574) 129,780 41,997
Derivatives financial assets for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on transactions 27,628   6,050
Gain (loss) on valuation 150,699 203,961 (2,707)
Other comprehensive income (loss) for the year 88,048 144,967 (2,373)
Reclassified to profit or loss from other comprehensive income (loss) for the year ₩ (110,616) ₩ (143,305) ₩ 3,645