v3.26.1
Income tax expense - Details of Temporary differences unused tax losses and credits (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance ₩ (785,886) ₩ (376,945) ₩ 77,500
Changes in deferred tax liability (asset) [abstract]      
Business combination 435,999 (544) (11,593)
Recognized as income (expense) 332,763 (426,525) (218,184)
Recognized as other comprehensive income (expense) (72,969) 18,128 (224,668)
Others (1,085)    
Ending balance (91,178) (785,886) (376,945)
Deferred tax liability asset arising from Unused tax losses ₩ 318,085 ₩ 12,507 ₩ 1,998
Description of composition of other termporary differences Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from unused tax losses amounts to 318,085 million won. Among the deferred tax assets and liabilities classified as ‘Others’, the deferred tax asset arising from unused tax losses amounts to 12,507 million won. Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from unused tax losses amounts to 1,998 million Won.
Gain (loss) on financial assets      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance ₩ (252,454) ₩ (157,394) ₩ 373,145
Changes in deferred tax liability (asset) [abstract]      
Business combination 417,200 0 0
Recognized as income (expense) 41,158 (110,523) (272,072)
Recognized as other comprehensive income (expense) 459,475 15,463 (258,467)
Others 0    
Ending balance 665,379 (252,454) (157,394)
Gain (loss) on valuation using the equity method of accounting      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (17,155) (10,372) 20,555
Changes in deferred tax liability (asset) [abstract]      
Business combination 0 0 0
Recognized as income (expense) (19,487) (8,391) (35,357)
Recognized as other comprehensive income (expense) 1,198 1,608 4,430
Others 0    
Ending balance (35,444) (17,155) (10,372)
Gain (loss) on valuation of derivatives      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (253,552) 35,812 10,617
Changes in deferred tax liability (asset) [abstract]      
Business combination 1,679 0 0
Recognized as income (expense) 123,880 (289,117) 24,869
Recognized as other comprehensive income (expense) 58,393 (247) 326
Others 0    
Ending balance (69,600) (253,552) 35,812
Accrued income      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (116,680) (132,938) (90,330)
Changes in deferred tax liability (asset) [abstract]      
Business combination (218,608) 0 0
Recognized as income (expense) (21,577) 16,258 (42,608)
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance (356,865) (116,680) (132,938)
Provision for loan losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 82,484 40,988 (20,105)
Changes in deferred tax liability (asset) [abstract]      
Business combination 0 0 0
Recognized as income (expense) 27,327 41,496 61,093
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance 109,811 82,484 40,988
Loan and receivables written off      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 8,703 9,772 7,926
Changes in deferred tax liability (asset) [abstract]      
Business combination 0 0 0
Recognized as income (expense) 1,012 (1,069) 1,846
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance 9,715 8,703 9,772
Loan origination costs and fees      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (180,192) (173,417) (169,093)
Changes in deferred tax liability (asset) [abstract]      
Business combination (492) 0 0
Recognized as income (expense) 33,131 (6,775) (4,324)
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance (147,553) (180,192) (173,417)
Defined benefit liability      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 478,393 427,265 369,785
Changes in deferred tax liability (asset) [abstract]      
Business combination 12,301 0 0
Recognized as income (expense) 52,063 29,008 29,308
Recognized as other comprehensive income (expense) 6,714 22,120 28,172
Others 0    
Ending balance 549,471 478,393 427,265
Deposits with employee retirement insurance trust      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (499,604) (499,718) (450,222)
Changes in deferred tax liability (asset) [abstract]      
Business combination (52) 0 0
Recognized as income (expense) (81,932) (400) (50,044)
Recognized as other comprehensive income (expense) 64 514 548
Others 0    
Ending balance (581,524) (499,604) (499,718)
Provision for guarantee      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 5,800 8,274 8,328
Changes in deferred tax liability (asset) [abstract]      
Business combination 0 0 0
Recognized as income (expense) 1,207 (2,474) (54)
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance 7,007 5,800 8,274
Other provision      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 131,547 179,117 87,229
Changes in deferred tax liability (asset) [abstract]      
Business combination (491) 0 0
Recognized as income (expense) 28,563 (47,570) 91,888
Recognized as other comprehensive income (expense) 0 0 0
Others 0    
Ending balance 159,619 131,547 179,117
Net financial gain (loss) on insurance contract assets (liabilities)      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 0    
Changes in deferred tax liability (asset) [abstract]      
Business combination 194,666    
Recognized as income (expense) (75,169)    
Recognized as other comprehensive income (expense) (609,063)    
Others 0    
Ending balance (489,566) 0  
Net financial gain (loss) on reinsurance contract assets (liabilities)      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance 0    
Changes in deferred tax liability (asset) [abstract]      
Business combination (24,384)    
Recognized as income (expense) 33,142    
Recognized as other comprehensive income (expense) 4,525    
Others 0    
Ending balance 13,283 0  
Others      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning balance (173,176) [1],[2] (104,334) [2],[3] (70,335) [3]
Changes in deferred tax liability (asset) [abstract]      
Business combination 54,180 [1] (544) [2] (11,593) [3]
Recognized as income (expense) 189,445 [1] (46,968) [2] (22,729) [3]
Recognized as other comprehensive income (expense) 5,725 [1] (21,330) [2] 323 [3]
Others [1] (1,085)    
Ending balance ₩ 75,089 [1] ₩ (173,176) [1],[2] ₩ (104,334) [2],[3]
[1] Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from unused tax losses amounts to 318,085 million won.
[2] Among the deferred tax assets and liabilities classified as ‘Others’, the deferred tax asset arising from unused tax losses amounts to 12,507 million won.
[3] Among the deferred tax assets and liabilities classified as ‘Others,’ the deferred tax asset arising from unused tax losses amounts to 1,998 million Won.