v3.26.1
Statements of Cash Flows - Reconciliation of Liabilities Arising from Financing Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance ₩ 11,402,502 ₩ 11,808,609
Cash flows (917,826) (852,272)
Exchange rate changes [1] (31,078) 179,773
Fair value changes 16,549 (163,051)
Other changes 250,000 429,443
Ending balance 10,720,147 11,402,502
Short-term borrowings [Member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 100,000  
Cash flows 30,000 100,000
Ending balance 130,000 100,000
Long-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 515,600 718,078
Cash flows (12,500) (202,500)
Other changes 25 22
Ending balance 503,125 515,600
Debentures [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 8,511,280 8,325,643
Cash flows (246,201) 725
Exchange rate changes [1] (31,078) 179,773
Other changes (20,097) 5,139
Ending balance 8,213,904 8,511,280
Lease liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,637,951 1,611,433
Cash flows (372,834) (381,347)
Other changes 260,681 407,865
Ending balance 1,525,798 1,637,951
Long-term payables – other [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 907,720 1,260,453
Cash flows (369,150) (369,150)
Other changes 9,391 16,417
Ending balance 547,961 907,720
Derivative financial liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 748 9,212
Fair value changes (127) (8,464)
Ending balance 621 748
Derivative financial assets [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance (270,797) (116,210)
Cash flows 52,859  
Fair value changes 16,676 (154,587)
Ending balance ₩ (201,262) ₩ (270,797)
[1] The effect of changes in foreign exchange rates for financial liabilities at amortized cost.