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Intangible assets - Total recoverable amount and total carrying value of CGUs to which goodwill has been allocated (Details)
₩ in Millions
Dec. 31, 2025
KRW (₩)
Total Recoverable Amount And Total Carrying Value Of CGUs To Which Goodwill Has Been Allocated, Are As Follows [Abstract]  
Total recoverable amount ₩ 63,569,922
Total carrying amount 55,556,858 [1]
Difference ₩ 8,013,064
[1] It is the carrying amount after reflecting the impairment loss in the securities.