v3.26.1
Financial Risk Management - Changes of Financial Assets Classified as Level 3 (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Disclosure of fair value measurement of assets [line items]  
Balance at beginning ₩ 30,515,255
Balance at ending 30,107,783
Balance at beginning (18,687,621)
Balance at ending (17,152,491)
Level 3 [member]  
Disclosure of fair value measurement of assets [line items]  
Balance at beginning 687,689
Gain / (Loss) 44,599
OCI 1,347,128
Acquisition 28,736
Disposal (70,059)
Transfer 292,698
Balance at ending 2,330,791
FVTPL [member] | Level 3 [member]  
Disclosure of fair value measurement of assets [line items]  
Balance at beginning 209,101
Gain / (Loss) 44,599
OCI (1,271)
Acquisition 27,312
Disposal (20,591)
Transfer 12,319
Balance at ending 271,469
Balance at beginning 2,689
Gain for the period (204)
OCI 0
Acquisition (13,279)
Disposal 10,416
Transfer 0
Balance at ending (5,756)
Financial assets at FVOCI [member] | Level 3 [member]  
Disclosure of fair value measurement of assets [line items]  
Balance at beginning 478,588
Gain / (Loss) 0
OCI 1,348,399
Acquisition 1,424
Disposal (49,468)
Transfer 280,379
Balance at ending ₩ 2,059,322