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Earnings per share - Summary of earnings per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions		12 Months Ended
	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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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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