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Provisions - Summary of changes in provision for unused credit commitments and financial guarantee contracts issued (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Changes in provisions [Line Items] |  |
Beginning balance | ₩ 1,308,896 |
Ending balance | 1,363,345 | ₩ 1,308,896
Provision for unused credit commitments and financial guarantee contracts issued |  |
Changes in provisions [Line Items] |  |
Beginning balance | 498,363 | 395,589
Transfer (from) to 12 months expected credit loss | 0 | 0
Transfer (from) to life time expected credit loss | 0 | 0
Transfer (from) to impaired financial asset | 0 | 0
Provided |  | 41,910
Reversed | (105,879) |
Change in foreign exchange rate | (4,020) | 9,795
Others | 11,184 | 51,069
Ending balance | 399,648 | 498,363
Unused credit commitments provision | 12-month expected credit losses |  |
Changes in provisions [Line Items] |  |
Beginning balance | 229,415 | 206,687
Transfer (from) to 12 months expected credit loss | 48,121 | 68,071
Transfer (from) to life time expected credit loss | (13,183) | (11,698)
Transfer (from) to impaired financial asset | (767) | (806)
Reversed | (50,312) | (40,306)
Change in foreign exchange rate | (3,089) | 5,340
Others | (295) | 2,127
Ending balance | 209,890 | 229,415
Unused credit commitments provision | Lifetime expected credit losses |  |
Changes in provisions [Line Items] |  |
Beginning balance | 88,843 | 129,182
Transfer (from) to 12 months expected credit loss | (47,999) | (67,931)
Transfer (from) to life time expected credit loss | 13,237 | 11,723
Transfer (from) to impaired financial asset | (972) | (1,561)
Provided | 40,278 | 16,043
Change in foreign exchange rate | (445) | 1,347
Others | 0 | 40
Ending balance | 92,942 | 88,843
Unused credit commitments provision | Impaired financial asset |  |
Changes in provisions [Line Items] |  |
Beginning balance | 93,017 | 19,722
Transfer (from) to 12 months expected credit loss | (122) | (140)
Transfer (from) to life time expected credit loss | (54) | (25)
Transfer (from) to impaired financial asset | 1,739 | 2,367
Provided |  | 71,093
Reversed | (91,457) |
Change in foreign exchange rate | 0 | 0
Others | 0 | 0
Ending balance | 3,123 | 93,017
Financial guarantee contracts |  |
Changes in provisions [Line Items] |  |
Beginning balance | 87,088 |
Ending balance | 93,693 | 87,088
Financial guarantee contracts | 12-month expected credit losses |  |
Changes in provisions [Line Items] |  |
Beginning balance | 80,780 | 32,002
Transfer (from) to 12 months expected credit loss | 1,420 | 4,968
Transfer (from) to life time expected credit loss | (3,336) | (366)
Transfer (from) to impaired financial asset | 0 | 0
Reversed | (3,308) | (3,783)
Change in foreign exchange rate | (333) | 2,316
Others | 6,915 | 45,643
Ending balance | 82,138 | 80,780
Financial guarantee contracts | Lifetime expected credit losses |  |
Changes in provisions [Line Items] |  |
Beginning balance | 6,296 | 7,590
Transfer (from) to 12 months expected credit loss | (1,420) | (4,968)
Transfer (from) to life time expected credit loss | 3,336 | 366
Transfer (from) to impaired financial asset | 0 | 0
Reversed | (1,077) | (1,139)
Change in foreign exchange rate | (154) | 791
Others | 4,573 | 3,656
Ending balance | 11,554 | 6,296
Financial guarantee contracts | Impaired financial asset |  |
Changes in provisions [Line Items] |  |
Beginning balance | 12 | 406
Transfer (from) to 12 months expected credit loss | 0 | 0
Transfer (from) to life time expected credit loss | 0 | 0
Transfer (from) to impaired financial asset | 0 | 0
Provided |  | 2
Reversed | (3) |
Change in foreign exchange rate | 1 | 1
Others | (9) | (397)
Ending balance | 1 | 12
Other provisions |  |
Changes in provisions [Line Items] |  |
Beginning balance | 810,533 | 974,077
Provided | 349,146 | 369,755
Provision used | (204,225) | (540,997)
Change in foreign exchange rate | (79) | 1,929
Others | 8,322 | 5,769
Ending balance | 963,697 | 810,533
Asset retirement |  |
Changes in provisions [Line Items] |  |
Beginning balance | 99,306 | 99,927
Provided | 6,739 | 957
Provision used | (3,363) | (7,282)
Change in foreign exchange rate | 0 | 0
Others | 3,443 | 5,704
Ending balance | 106,125 | 99,306
Litigation |  |
Changes in provisions [Line Items] |  |
Beginning balance | 114,750 | 31,371
Provided | 26,032 | 83,862
Provision used | (69,713) | (483)
Change in foreign exchange rate | 0 | 0
Others | 73,104 | 0
Ending balance | 144,173 | 114,750
Guarantee |  |
Changes in provisions [Line Items] |  |
Beginning balance | 17,363 | 23,163
Provided | 404 |
Reversed |  | (8,471)
Provision used | 0 | 0
Change in foreign exchange rate | (245) | 2,412
Others | 92 | 259
Ending balance | 17,614 | 17,363
Other |  |
Changes in provisions [Line Items] |  |
Beginning balance | 579,114 | 819,616
Provided | 315,971 | 293,407
Provision used | (131,149) | (533,232)
Change in foreign exchange rate | 166 | (483)
Others | (68,317) | (194)
Ending balance | 695,785 | ₩ 579,114
Gross carrying amount [member] |  |
Changes in provisions [Line Items] |  |
Others | ₩ 72,868 |

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- Definition The increase in existing other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_b&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 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&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 257 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84&doctype=Standard -URIDate 2025-03-27 + Details
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