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Financial risk management - Credit risk exposures per credit grade of off-balance items (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | ₩ 246,539,021 | ₩ 241,489,989
Grade 1 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 216,315,725 | 213,873,159
Grade 2 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 30,106,405 | 27,590,175
Financial instruments credit-impaired |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 116,891 | 26,655
Guarantee contracts |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 26,221,968 | 22,509,195
Guarantee contracts | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 25,091,117 | 21,999,238
Guarantee contracts | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 1,119,073 | 488,593
Guarantee contracts | Impaired [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 11,778 | 21,364
Guarantee contracts | Grade 1 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 21,520,346 | 19,573,874
Guarantee contracts | Grade 1 | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 20,555,651 | 19,212,434
Guarantee contracts | Grade 1 | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 964,695 | 361,440
Guarantee contracts | Grade 2 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 4,689,844 | 2,913,957
Guarantee contracts | Grade 2 | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 4,535,466 | 2,786,804
Guarantee contracts | Grade 2 | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 154,378 | 127,153
Guarantee contracts | Financial instruments credit-impaired |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 11,778 | 21,364
Guarantee contracts | Financial instruments credit-impaired | Impaired [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 11,778 | 21,364
Loan commitment and other credit line |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 220,317,053 | 218,980,794
Loan commitment and other credit line | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 208,673,535 | 205,616,647
Loan commitment and other credit line | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 11,538,405 | 13,358,856
Loan commitment and other credit line | Impaired [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 105,113 | 5,291
Loan commitment and other credit line | Grade 1 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 194,795,379 | 194,299,285
Loan commitment and other credit line | Grade 1 | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 185,899,148 | 183,928,715
Loan commitment and other credit line | Grade 1 | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 8,896,231 | 10,370,570
Loan commitment and other credit line | Grade 2 |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 25,416,561 | 24,676,218
Loan commitment and other credit line | Grade 2 | 12-month expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 22,774,387 | 21,687,932
Loan commitment and other credit line | Grade 2 | Lifetime expected credit losses |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 2,642,174 | 2,988,286
Loan commitment and other credit line | Financial instruments credit-impaired |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | 105,113 | 5,291
Loan commitment and other credit line | Financial instruments credit-impaired | Impaired [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit risk exposures | ₩ 105,113 | ₩ 5,291

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- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 + Details
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