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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Interest income ₩ 279,607 ₩ 271,925 ₩ 273,460
Interest expense (356,345) (293,854) (263,389)
Total (92,910) (353,980) 215,095
Other comprehensive income (loss) for the year 7,447 (2,194) 165,567
Reclassified to profit or loss from other comprehensive income (loss) for the year (37,942) (95,421)  
Interest expense (52,035) (41,469) (36,651)
Financial liabilities designated as at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (44) (4,046)  
Gain on foreign currency transaction (5) 24 (2)
Gain (loss) on disposal 4,788   2,136
Gain (loss) on valuation (7,394) 30,031 42,447
Derivatives used for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transactions   (1,291) (6,208)
Gain (loss) on valuation 11,503 (17,237) (7,206)
Other comprehensive income (loss) for the year 7,557 (23,957) (3,112)
Reclassified to profit or loss from other comprehensive income (loss) for the year (8,764) 15,195 6,722
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (358,486) (275,302) (232,197)
Gain on foreign currency transaction (24,054) (34,574) (3,580)
Gain (loss) on foreign currency translation (93,004) (168,577) (201,623)
Gain (loss) on valuation 3,411    
Lease liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (52,035) (41,469) (36,650)
Financial assets at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 360,134 144,505 74,937
Gain on foreign currency transaction 22,782 23,824 12,826
Gain (loss) on foreign currency translation 5,741 (2,151) 2,911
Gain (loss) on disposal (3,409) (81) 35
Gain (loss) on valuation (172,966) (132,102) (110,286)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 13,480 6,008 3,673
Dividend income 6,918 4,600 21,499
Gain on foreign currency transaction   1,100  
Gain (loss) on foreign currency translation 3,396 13,711 17,794
Gain (loss) on disposal 14,237 2,347 29,974
Gain (loss) on valuation (31,965) (29,282) 64,659
Financial assets at fair value through other comprehensive income [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 18,966 190,281 222,290
Dividend income 52,813 9,522 1,365
Gain (loss) on disposal (11,193) (62,183) (22,712)
Gain (loss) on valuation   (61)  
Other comprehensive income (loss) for the year 121,805 (158,574) 129,780
Derivatives financial assets for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transactions 10,192 27,628  
Gain (loss) on valuation 34,092 150,699 203,961
Other comprehensive income (loss) for the year 7,772 88,048 144,967
Reclassified to profit or loss from other comprehensive income (loss) for the year ₩ (29,178) ₩ (110,616) ₩ (143,305)