v3.26.1
Statements of cash flows - Summary of Adjustments from Financing Activities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance ₩ 78,805,474 ₩ 72,714,893 ₩ 73,139,759
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow 9,757,481 2,301,198 (1,032,435)
Not involving cash inflows and outflows      
Business Combination 1,754,456 0 4
Settlement of derivatives designated for hedging purposes (34,199) 0 0
Foreign Exchange (461,669) 2,998,380 274,590
Variation of gain(loss) on valuation of hedged items 402,964 (139,005) (29,114)
Others 524,566 [1] 930,008 [2] 362,089 [3]
Ending balance 90,749,073 78,805,474 72,714,893
Borrowings      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 30,117,031 30,986,746 28,429,603
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow 4,392,369 (3,011,120) 2,332,376
Not involving cash inflows and outflows      
Business Combination 0 0 0
Settlement of derivatives designated for hedging purposes 0 0 0
Foreign Exchange (326,602) 2,113,979 191,250
Variation of gain(loss) on valuation of hedged items 0 0 0
Others 469 [1] 27,426 [2] 33,517 [3]
Ending balance 34,183,267 30,117,031 30,986,746
Debentures      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 48,207,103 41,239,245 44,198,486
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow 5,599,481 5,594,220 (3,227,650)
Not involving cash inflows and outflows      
Business Combination 1,670,044 0 0
Settlement of derivatives designated for hedging purposes 0 0 0
Foreign Exchange (133,503) 870,846 82,210
Variation of gain(loss) on valuation of hedged items 80,760 17,417 58,306
Others 159,507 [1] 485,375 [2] 127,893 [3]
Ending balance 55,583,392 48,207,103 41,239,245
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 527,090 334,456 319,161
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow (251,559) (238,770) (160,673)
Not involving cash inflows and outflows      
Business Combination 48,656 0 0
Settlement of derivatives designated for hedging purposes 0 0 0
Foreign Exchange (1,564) 13,555 1,130
Variation of gain(loss) on valuation of hedged items 0 0 0
Others 218,949 [1] 417,849 [2] 174,838 [3]
Ending balance 541,572 527,090 334,456
Net derivative liabilities (for hedging purposes)      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance (72,376) 126,299 165,125
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow 17,231 (25,442) 23,394
Not involving cash inflows and outflows      
Business Combination 20,313 0 0
Settlement of derivatives designated for hedging purposes (34,199) 0 0
Foreign Exchange 0 0 0
Variation of gain(loss) on valuation of hedged items 322,204 (156,422) (87,420)
Others 145,008 [1] (16,811) [2] 25,200 [3]
Ending balance 398,181 (72,376) 126,299
Other Liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 26,626 28,147 27,384
Changes in liabilities arising from financing activities [abstract]      
Financing activities Cash flow (41) (17,690) 118
Not involving cash inflows and outflows      
Business Combination 15,443 0 4
Settlement of derivatives designated for hedging purposes 0 0 0
Foreign Exchange 0 0 0
Variation of gain(loss) on valuation of hedged items 0 0 0
Others 633 [1] 16,169 [2] 641 [3]
Ending balance ₩ 42,661 ₩ 26,626 ₩ 28,147
[1] The change in lease liabilities due to the new contract includes 201,562 million Won.
[2] The change in lease liabilities due to the new contract includes 366,340 million Won.
[3] The change in lease liabilities due to the new contract includes 210,810 million Won.