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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