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Defined benefit plans - Summary of changes in the present value of defined benefit obligation and plan assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in the present value of defined benefit obligation and plan assets [Line Items]    
Beginning balance ₩ (116,723) [1] ₩ (46,758)
Included in profit or loss:    
Current service cost 166,534 164,062
Past service cost 8,624 (18,613)
Net interest expense (income) (16,951) (14,904)
Settlement loss (gain) (885) (1,972)
Subtotal 157,322 128,573
Included in other comprehensive income:    
Demographic assumptions (3,913) (2,338)
Financial assumptions (27,093) 143,990
Experience adjustment 28,921 (121,322)
Return on plan assets excluding interest income 34,682 30,571
Subtotal 32,597 50,901
Other:    
Benefits paid by the plan (149,638) (82,725)
Contributions paid into the plan (258,683) (166,447)
Settlement gain or loss 188 5
Changes in the scope of consolidation (496)  
Effect of changes in foreign exchange rates 156 (272)
Subtotal (408,473) (249,439)
Ending balance [1] (335,277) (116,723)
Defined benefit obligation    
Changes in the present value of defined benefit obligation and plan assets [Line Items]    
Beginning balance 2,345,148 2,219,490
Included in profit or loss:    
Current service cost 166,534 164,062
Past service cost 8,624 (18,613)
Net interest expense (income) 96,771 107,274
Settlement loss (gain) (893) (1,990)
Subtotal 271,036 250,733
Included in other comprehensive income:    
Demographic assumptions (3,913) (2,338)
Financial assumptions (29,812) 141,583
Experience adjustment 28,921 (121,322)
Return on plan assets excluding interest income 0 605
Subtotal (4,804) 18,528
Other:    
Benefits paid by the plan (298,060) (143,331)
Contributions paid into the plan 0 0
Settlement gain or loss 188 0
Changes in the scope of consolidation (496)  
Effect of changes in foreign exchange rates 156 (272)
Subtotal (298,212) (143,603)
Ending balance 2,313,168 2,345,148
Plan assets    
Changes in the present value of defined benefit obligation and plan assets [Line Items]    
Beginning balance (2,461,871) (2,266,248)
Included in profit or loss:    
Current service cost 0 0
Past service cost 0 0
Net interest expense (income) (113,722) (122,178)
Settlement loss (gain) 8 18
Subtotal (113,714) (122,160)
Included in other comprehensive income:    
Demographic assumptions 0 0
Financial assumptions 2,719 2,407
Experience adjustment 0 0
Return on plan assets excluding interest income 34,682 29,966
Subtotal 37,401 32,373
Other:    
Benefits paid by the plan 148,422 60,606
Contributions paid into the plan (258,683) (166,447)
Settlement gain or loss 0 5
Changes in the scope of consolidation 0  
Effect of changes in foreign exchange rates 0 0
Subtotal (110,261) (105,836)
Ending balance ₩ (2,648,445) ₩ (2,461,871)
[1] The asset for defined benefit obligation of W116,723 million as of December 31, 2024 is the net defined benefit assets of W155,697 million less the net defined liabilities of W38,974 million. In addition, the asset for defined benefit obligation of W 335,277 million as of December 31, 2025 is the net defined benefit assets of W353,097 million less the net defined liabilities of W17,820 million.