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Fair Value - Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Beginning balance ₩ 13,766,638  
Ending balance 15,486,942 ₩ 13,766,638
Beginning balance 18,825,390  
Ending balance 19,611,825 18,825,390
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 1,064,856  
Ending balance 939,661 1,064,856
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 1,113 31,565
Reclassification (1,113)  
Disposal 0 (31,565)
Amount recognized in profit or loss 0 0
Amount recognized in other comprehensive income 0 1,113
Ending balance 0 1,113
Recurring fair value measurement [Member] | Level 3 [Member] | Financial liabilities designated as at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 141,280 215,332
Purchases 0 3,046
Reclassification (7,363) (54,921)
Disposal (5,205)  
Amount recognized in profit or loss 5,849 (22,177)
Ending balance 134,561 141,280
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 612,069 577,085
Purchases 216,838 226,310
Reclassification 26,471 (8,962)
Acquisition and disposition of businesses 252 0
Disposal (44,323) (179,740)
Amount recognized in profit or loss (42,475) (2,624)
Ending balance 768,832 612,069
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 497,129 323,373
Purchases 10,267 262,408
Reclassification (5,532) 8,122
Acquisition and disposition of businesses 0 (40)
Disposal (6) (97,426)
Amount recognized in profit or loss (61) 18
Amount recognized in other comprehensive income (57,771) 674
Ending balance ₩ 444,026 ₩ 497,129