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Intangible assets - Changes in intangible assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in intangible assets [Line Items]    
Beginning balance ₩ 6,120,133 ₩ 6,217,946
Acquisition 288,156 373,599
Disposal and Write-off (14,967) (11,623)
Amounts transferred from (to) property and equipment (7,548) (2,302)
Amounts transferred within intangible assets (2,252) 0
Impairment (796) [1] (25,356) [2]
Amortization [3] (478,694) (449,978)
Effects of changes in foreign exchange rate (10,874) 17,847
Ending balance 5,893,158 6,120,133
Goodwill    
Changes in intangible assets [Line Items]    
Beginning balance 4,665,417 4,677,204
Acquisition 0 0
Disposal and Write-off 0 0
Amounts transferred from (to) property and equipment 0 0
Amounts transferred within intangible assets 0 0
Impairment 0 [1] (24,513) [2]
Amortization [3] 0 0
Effects of changes in foreign exchange rate (8,744) 12,726
Ending balance 4,656,673 4,665,417
Software    
Changes in intangible assets [Line Items]    
Beginning balance 235,229 259,233
Acquisition 108,624 67,077
Disposal and Write-off (969) (2,822)
Amounts transferred from (to) property and equipment 0 0
Amounts transferred within intangible assets (2,252) 905
Impairment (499) [1] 0 [2]
Amortization [3] (94,261) (96,335)
Effects of changes in foreign exchange rate 5,306 7,171
Ending balance 251,178 235,229
Development cost    
Changes in intangible assets [Line Items]    
Beginning balance 677,572 464,638
Acquisition 82,897 196,292
Disposal and Write-off (180) (418)
Amounts transferred from (to) property and equipment (7,548) (2,302)
Amounts transferred within intangible assets 0 165,761
Impairment 0 [1] (715) [2]
Amortization [3] (210,459) (179,302)
Effects of changes in foreign exchange rate 1,711 33,618
Ending balance 543,993 677,572
Others    
Changes in intangible assets [Line Items]    
Beginning balance 541,915 816,871
Acquisition 96,635 110,230
Disposal and Write-off (13,818) (8,383)
Amounts transferred from (to) property and equipment 0 0
Amounts transferred within intangible assets 0 (166,666)
Impairment (297) [1] (128) [2]
Amortization [3] (173,974) (174,341)
Effects of changes in foreign exchange rate (9,147) (35,668)
Ending balance ₩ 441,314 ₩ 541,915
[1] Included in the non-operating expenses of the consolidated statement of comprehensive income.
[2] Goodwill impairment incurred from the cash-generating unit of security sector at Shinhan Securities Vietnam Co., Ltd. and other sector at Shinhan Asset Trust Co., Ltd. As a result of the impairment test for goodwill of Shinhan Securities Vietnam Co., Ltd., the Group recognized an impairment loss amounting to W 1,298 million for the carrying amount exceeding the recoverable amount of the CGU. This is due to the decrease in recoverable amounts resulting from the reduced trading volume and trading value on the Vietnamese stock market, caused by the global high interest rate environment and domestic and external economic recessions. In addition, as a result of the impairment test for goodwill of Shinhan Asset Trust Co., Ltd., the Group recognized an impairment loss amounting to W 23,215 million for the carrying amount exceeding the recoverable amount of the CGU. This is due to the decrease in recoverable amounts resulting from the deterioration of the business environment caused by the slowdown in the real estate and construction sectors. The amount of impairment loss recognized is included in the non-operating expenses, of the consolidated statement of comprehensive income.
[3] Included in general administrative expense, other operating expense, and insurance service expense of the consolidated statements of comprehensive income.