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Intangible assets - Goodwill allocated in the Group's CGUs (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Goodwill
Goodwill allocated in the Group's CGUs [Line Items]
Goodwill allocated in the Group's CGUs	₩ 4,656,673	₩ 4,665,417
Banking
Goodwill allocated in the Group's CGUs [Line Items]
Goodwill allocated in the Group's CGUs	769,304	771,156
Credit card
Goodwill allocated in the Group's CGUs [Line Items]
Goodwill allocated in the Group's CGUs	2,894,610	2,901,502
Life insurance
Goodwill allocated in the Group's CGUs [Line Items]
Goodwill allocated in the Group's CGUs	850,238	850,238
Others
Goodwill allocated in the Group's CGUs [Line Items]
Goodwill allocated in the Group's CGUs	₩ 142,521	₩ 142,521

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