v3.26.1
Fair value of financial assets and liabilities - Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost (Details)
$ in Thousands, ₩ in Millions
12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2025
USD ($)
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost ₩ 18,707,459 ₩ 19,203,177 $ 12,950,371
Loans and other financial assets at amortized cost 412,495,783 [1] 398,471,816 [1] 285,553,136
Deposits due to customers 376,580,845 366,821,156 260,690,765
Borrowings 34,183,267 30,117,031  
Debentures [2] 55,583,392 48,207,103  
Investment contract liabilities 3,433,611 0 $ 2,376,942
Securities at amortized cost      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost 18,650,905 19,146,951  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost ₩ 18,707,459 ₩ 19,203,177  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flows of debt securities by applying risk-free market rate with credit spread. The fair value is measured by discounting the projected cash flows of debt securities by applying risk-free market rate with credit spread.  
Input variables Risk-free market rate and credit spread Risk-free market rate and credit spread  
Securities at amortized cost | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost ₩ 6,900,333 ₩ 3,242,384  
Securities at amortized cost | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost 11,750,572 15,894,576  
Securities at amortized cost | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Securities at amortized cost 0 9,991  
Loans and other financial assets at amortized cost      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Loans and other financial assets at amortized cost 415,154,239 401,144,172  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Loans and other financial assets at amortized cost ₩ 412,495,783 ₩ 398,471,816  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor. The fair value is measured by discounting the projected cash flows of loan products by applying the market discount rate that has been applied to a proxy company that has similar credit rating to the debtor.  
Input variables Risk-free market rate, credit spread and prepayment rate Risk-free market rate, credit spread and prepayment rate  
Loans and other financial assets at amortized cost | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Loans and other financial assets at amortized cost ₩ 0 ₩ 0  
Loans and other financial assets at amortized cost | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Loans and other financial assets at amortized cost 9,214,407 7,149,151  
Loans and other financial assets at amortized cost | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Loans and other financial assets at amortized cost 405,939,832 393,995,021  
Deposits due to customers      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Deposits due to customers 376,725,914 367,128,451  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Deposits due to customers ₩ 376,580,845 ₩ 366,821,156  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products. The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products.  
Input variables Risk-free market rate, credit spread and forward rate Risk-free market rate, credit spread and forward rate  
Deposits due to customers | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Deposits due to customers ₩ 0 ₩ 0  
Deposits due to customers | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Deposits due to customers 376,725,914 367,128,451  
Deposits due to customers | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Deposits due to customers 0 0  
Borrowings      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Borrowings 34,137,635 30,055,266  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Borrowings ₩ 34,183,267 ₩ 30,117,031  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products. The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products.  
Input variables Risk-free market rate, credit spread and forward rate Risk-free market rate, credit spread and forward rate  
Borrowings | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Borrowings ₩ 0 ₩ 0  
Borrowings | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Borrowings 33,953,026 29,622,705  
Borrowings | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Borrowings 184,609 432,561  
Debentures      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Debentures 55,558,143 48,273,103  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Debentures ₩ 55,583,392 ₩ 48,207,103  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products. The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products.  
Input variables Risk-free market rate, credit spread and forward rate Risk-free market rate, credit spread and forward rate  
Debentures | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Debentures ₩ 0 ₩ 0  
Debentures | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Debentures 54,302,059 48,273,103  
Debentures | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Debentures 1,256,084 ₩ 0  
Investment contract liabilities      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Investment contract liabilities 3,433,611    
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Investment contract liabilities ₩ 3,433,611    
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods Since it is difficult to derive reliable expected cash flows, the book value of the reserves calculated in accordance with the Insurance Business Act and the Insurance Supervisory Regulations was used as a proxy for fair value. Since it is difficult to derive reliable expected cash flows, the book value of the reserves calculated in accordance with the Insurance Business Act and the Insurance Supervisory Regulations was used as a proxy for fair value.  
Investment contract liabilities | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Investment contract liabilities ₩ 0    
Investment contract liabilities | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Investment contract liabilities 0    
Investment contract liabilities | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Investment contract liabilities 3,433,611    
Other financial liabilities      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Other financial liabilities 37,405,453 [3] ₩ 31,010,236 [4]  
Carrying value of financial assets liabilities measured at amortised cost [Abstract]      
Other financial liabilities ₩ 37,576,486 [3] ₩ 31,786,960 [4]  
Disclosure of financial assets liabilities measured at amortised [Abstract]      
Fair value measurement methods The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products. The fair value is measured by discounting the projected cash flow of debt products by applying the market discount rate that is reflecting credit rating of the Group or the market discount rate used for similar in products.  
Input variables Risk-free market rate, credit spread and forward rate Risk-free market rate, credit spread and forward rate  
Other financial liabilities | Level 1      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Other financial liabilities ₩ 0 [3] ₩ 0 [4]  
Other financial liabilities | Level 2      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Other financial liabilities 36,473,258 [3] 30,201,229 [4]  
Other financial liabilities | Level 3      
Fair value of financial assets liabilities measured at amortised cost [Abstract]      
Other financial liabilities ₩ 932,195 [3] ₩ 809,007 [4]  
[1] Cash and cash equivalents are not included
[2] Included debentures under fair value hedge amounting to and 3,952,047 million Won and 4,046,624 million Won as of December 31, 2024 and 2025 respectively. Also, debentures under cash flow hedge amounting to 1,860,100 million Won and 1,410,514 million Won are included as of December 31, 2024 and 2025 respectively.
[3] Lease liabilities are excluded as of December 31, 2025.
[4] Lease liabilities are excluded as of December 31, 2024.