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Related parties - Significant borrowing and repayment transactions with related parties (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | ₩ 422,781,045 |
Ending | 447,648,971 | ₩ 422,781,045
Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 21,159 | 513
Borrowing | 45,800 | 49,904
Repayment | (48,559) | (29,258)
Ending | 18,400 | 21,159
NH-J&-IBKC Label Technology Fund | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 59 | 248
Borrowing | 0 | 522
Repayment | (59) | (711)
Ending | 0 | 59
Shinhan Rio Green Private Equity Fund [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 0 |
Borrowing | 4,600 |
Repayment | (4,600) |
Ending | 0 | 0
TECHFIN RATINGS Co., Ltd [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 18,000 | 0
Borrowing | 24,500 | 46,000
Repayment | (29,000) | (28,000)
Ending | 13,500 | 18,000
CJL No.1 Private Equity Fund | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 0 | 265
Borrowing |  | 282
Repayment |  | (547)
Ending |  | 0
ShinhanCJ TechInnovation Fund 1st [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 3,100 | 0
Borrowing | 14,500 | 3,100
Repayment | (14,100) | 0
Ending | 3,500 | 3,100
D2U 12th Fund [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 0 |
Borrowing | 900 |
Repayment | (500) |
Ending | 400 | 0
Meta TB ESG Private Equity Fund I [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 0 |
Borrowing | 300 |
Repayment | (300) |
Ending | 0 | 0
Korea Credit Bureau [Member] | Investments In Associates [Member] |  |
Disclosure Of significant borrowing and repayment transactions with related parties [Line Items] |  |
Beginning | 0 |
Borrowing | 1,000 |
Repayment | 0 |
Ending | ₩ 1,000 | ₩ 0

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