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Net gains (losses) on financial instruments measured at fair value through profit or loss - Summary of Net gains (losses) on financial instruments measured at fair value through profit or loss (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Net gain (loss) on financial instruments at fair value through profit or loss ₩ 2,409,365 ₩ 1,210,771 ₩ 2,493,626
Net gain on disposal of financial asset at fair value through other comprehensive income (Note 11) 193,612 60,260 (129,575)
Gains (losses) recognised in other comprehensive income on exchange differences, fair value measurement, liabilities (515,227) (170,128) (58,959)
Equity Securities Measured At Fair Value Through Other Comprehensive Income [Member]      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Net gain on disposal of financial asset at fair value through other comprehensive income (Note 11) 881,358 1,428,168 1,576,931
Debt Securities Measured At Fair Value Through Other Comprehensive Income [Member]      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Net gain on disposal of financial asset at fair value through other comprehensive income (Note 11) 1,430,147 646,882 969,135
Due from banks at FVTPL      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Gain (loss) on valuation 6,465 (711) 3,964
Loan receivables measured at FVTPL      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Gain (loss) on valuation (68,284) (2,755) (6,562)
Net gain (loss) on financial instruments at fair value through profit or loss (67,797) 87,472 30,212
Securities at FVTPL      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Loss on sale 487 90,227 36,774
Gain (loss) on valuation 204,485 663,877 755,501
Gain (loss) on sale (10,263) (39,354) 197,148
Other gains (losses) of debt securities 687,136 803,645 624,282
Gain (loss) on valuation of equity securities 934,475 161,316 540,188
Gain (loss) on sale of equity securities 495,672 485,566 428,947
Gain (loss) on valuation of other securities 337,239 36,688 11,635
Net gain (loss) on financial instruments at fair value through profit or loss 2,648,744 2,111,738 2,557,701
Financial liabilities at fair value through profit or loss      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Gain (loss) on valuation 9,972 (3,593) (60,144)
Gain (loss) on sale (39,802) (249,398) (88,398)
Gain (loss) on valuation of other securities (527,558) (173,058) (60,565)
Gain (loss) on sale of other securities 12,331 2,930 1,606
Net gain (loss) on financial instruments at fair value through profit or loss (545,057) (423,119) (207,501)
Gains (losses) recognised in other comprehensive income on exchange differences, fair value measurement, liabilities (29,830) (252,991) (148,542)
Derivatives      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Gain (loss) on transaction of derivatives (143,514) (646,793) (183,233)
Gain (loss) on valuation of derivatives 510,524 82,184 292,483
Derivatives | Debt Securities Measured At Fair Value Through Other Comprehensive Income [Member]      
Net gain (loss) on financial instruments measured at fair value through profit or loss [Line Items]      
Net gain (loss) on financial instruments at fair value through profit or loss ₩ 367,010 ₩ (564,609) ₩ 109,250