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Operating revenue - Summary detail operating revenue explanatory (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenue [abstract]      
Interest income ₩ 27,988,801 ₩ 29,209,338 ₩ 27,579,211
Fees and commission income 4,564,323 4,295,366 4,175,243
Insurance income 3,364,322 3,116,553 2,899,599
Reinsurance income 202,299 73,578 44,985
Insurance finance income 44,087 202,363 143,064
Dividend income 209,681 239,097 181,486
Net gain on financial instruments measured at FVTPL 4,823,409 4,264,126 4,254,811
Gain on trading derivatives measured at FVTPL 17,568,108 22,397,247 17,208,758
Net gain on financial instruments designated at FVTPL 232,193 252,924 438,709
Net gain on foreign currency transaction 3,683,224 8,084,564 3,201,023
Net gain on disposal of securities at FVOCI 287,564 197,708 50,793
Net gain on disposal of securities at amortized cost 2 0 358
Reversal of credit loss allowance 107,122 4,311 136
Gain related to hedging derivates 607,993 753,798 422,074
Other operating income 998,832 973,306 732,379
Total income ₩ 64,681,960 ₩ 74,064,279 ₩ 61,332,629