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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
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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

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