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Other assets - Summary of other assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Other Assets Disclosure [Abstract]    
Accounts receivable ₩ 27,441,511 ₩ 13,611,340
Domestic exchange settlement debit 11,258,959 4,909,780
Guarantee deposits 985,307 982,836
Discounted present value (51,293) (57,626)
Accrued income 3,774,852 3,810,267
Prepaid expense 393,748 381,091
Provisional payments 417,246 411,923
Sundry assets 250,017 136,079
Advance payments 671,143 484,828
Leased assets 1,890,090 2,125,379
Others 34,087 180,005
Allowances for credit loss of other assets (541,316) (574,304)
Total Other Assets ₩ 46,524,351 ₩ 26,401,598