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Earnings per share - Summary of earnings per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions |  | 12 Months Ended
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May 01, 2019 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Earnings per share [abstract] |  |  |  |  |  |  |
Profit attributable to equity holders of Shinhan Financial Group |  | ₩ 4,971,561 |  | ₩ 4,450,177 |  | ₩ 4,368,035 |
Less: |  |  |  |  |  |  |
Dividends to hybrid bonds |  | (197,932) |  | (176,945) |  | (189,672) |
Net profit available for common stock |  | ₩ 4,773,629 |  | ₩ 4,273,232 |  | ₩ 4,178,363 |
Weighted average number of ordinary shares outstanding | 485,494,934 | 486,484,485 | [1] | 506,231,595 | [1] | 519,207,776 | [1]
Basic earnings per share |  | ₩ 9,812 |  | ₩ 8,441 |  | ₩ 8,048 |
Diluted earnings per share |  | ₩ 9,812 |  | ₩ 8,441 |  | ₩ 8,048 |
[1] | The number of ordinary shares issued is 485,494,934 shares as of December 31, 2025, and the above weighted-average number of shares outstanding has been calculated by reflecting the following: (i) the conversion of 17,482,000 convertible preferred shares issued on May 1, 2019 into ordinary shares on May 1, 2023, for the year ended December 31, 2023; and (ii) changes in treasury stock, including shares acquired and subsequently retired, for the years ended December 31, 2023, 2024 and 2025.

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