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Statement of cash flows - Summary of changes in assets and liabilities arising from financing activities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | ₩ 144,697,942 | ₩ 139,689,840
Changes from cash flows | 4,289,584 | 1,193,515
Interest expense (Amortization) | (36,792) | (113,277)
Changes in foreign currency | (157,178) | 2,977,655
Other | 393,771 | 950,209
Ending balance | 149,187,327 | 144,697,942
Financial liabilities designated at FVTPL |  |
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | 261,299 | 254,832
Changes from cash flows | 49,985 | 0
Interest expense (Amortization) | 0 | 0
Changes in foreign currency | 15 | 0
Other | (23,450) | 6,467
Ending balance | 287,849 | 261,299
Derivatives |  |
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | (140,273) | 358,017
Changes from cash flows | 148,779 | 119,361
Interest expense (Amortization) | 0 | 0
Changes in foreign currency | 0 | 0
Other | (285,623) | (617,651)
Ending balance | (277,117) | (140,273)
Borrowings |  |
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | 49,920,373 | 56,901,352
Changes from cash flows | 5,125,412 | (8,231,239)
Interest expense (Amortization) | (100,672) | (131,663)
Changes in foreign currency | 60,971 | 770,798
Other | 388,750 | 611,125
Ending balance | 55,394,834 | 49,920,373
Debt securities issued |  |
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | 93,765,854 | 81,561,725
Changes from cash flows | (753,062) | 9,578,027
Interest expense (Amortization) | 42,896 | (4,401)
Changes in foreign currency | (210,960) | 2,178,255
Other | 146,694 | 452,248
Ending balance | 92,991,422 | 93,765,854
Lease liabilities |  |
Changes in assets and liabilities arising from financing activities [Line Items] |  |
Beginning balance | 890,689 | 613,914
Changes from cash flows | (281,530) | (272,634)
Interest expense (Amortization) | 20,984 | 22,787
Changes in foreign currency | (7,204) | 28,602
Other | 167,400 | 498,020
Ending balance | ₩ 790,339 | ₩ 890,689

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 44B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_44B_c&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 166 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_166_c&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 166 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_166_c&doctype=Standard -URIDate 2025-03-27 + Details
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