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Property and equipment - Changes in property and equipment (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule of Changes in property and equipment [Line Items]    
Beginning balance ₩ 4,157,592 ₩ 3,972,304
Acquisition 543,340 [1] 888,232 [2]
Disposals (68,928) [1] (57,580) [2]
Depreciation [3] (598,890) (596,443)
Asset impairment (923) (1,650)
Amounts transferred from (to) investment property (4,829) (77,752)
Amounts transferred from (to) intangible assets 7,548 2,302
Amounts transferred from (to) non-current assets held for sale (11,880) 1,039
Amounts transferred from (to) operating lease assets 30 80
Effects of foreign currency adjustments 2,158 27,060
Effects of business combinations 127,968  
Ending balance 4,153,186 4,157,592
Land    
Schedule of Changes in property and equipment [Line Items]    
Beginning balance 2,028,761 2,043,119
Acquisition 0 [1] 40,480 [2]
Disposals (591) [1] (500) [2]
Depreciation [3] 0 0
Asset impairment 0 0
Amounts transferred from (to) investment property (53,772) (61,432)
Amounts transferred from (to) intangible assets 0 0
Amounts transferred from (to) non-current assets held for sale (8,627) 528
Amounts transferred from (to) operating lease assets 0 0
Effects of foreign currency adjustments (230) 6,566
Effects of business combinations 0  
Ending balance 1,965,541 2,028,761
Buildings    
Schedule of Changes in property and equipment [Line Items]    
Beginning balance 738,626 790,251
Acquisition 46,132 [1] 23,661 [2]
Disposals (740) [1] (854) [2]
Depreciation [3] (58,376) (57,341)
Asset impairment (923) (1,703)
Amounts transferred from (to) investment property 48,943 (16,320)
Amounts transferred from (to) intangible assets 0 0
Amounts transferred from (to) non-current assets held for sale (3,170) 511
Amounts transferred from (to) operating lease assets 0 0
Effects of foreign currency adjustments 1,087 421
Effects of business combinations 127,888  
Ending balance 899,467 738,626
Others    
Schedule of Changes in property and equipment [Line Items]    
Beginning balance 514,955 532,459
Acquisition 207,342 [1] 199,988 [2]
Disposals (4,478) [1] (10,774) [2]
Depreciation [3] (205,579) (209,156)
Asset impairment 0 0
Amounts transferred from (to) investment property 0 0
Amounts transferred from (to) intangible assets 7,548 2,302
Amounts transferred from (to) non-current assets held for sale (83) 0
Amounts transferred from (to) operating lease assets 30 80
Effects of foreign currency adjustments 340 56
Effects of business combinations 76  
Ending balance 520,151 514,955
Right-of-use assets    
Schedule of Changes in property and equipment [Line Items]    
Beginning balance 875,250 606,475
Acquisition 289,866 [1] 624,103 [2]
Disposals (63,119) [1] (45,452) [2]
Depreciation [3] (334,935) (329,946)
Asset impairment 0 53
Amounts transferred from (to) investment property 0 0
Amounts transferred from (to) intangible assets 0 0
Amounts transferred from (to) non-current assets held for sale 0 0
Amounts transferred from (to) operating lease assets 0 0
Effects of foreign currency adjustments 961 20,017
Effects of business combinations 4  
Ending balance ₩ 768,027 ₩ 875,250
[1] During 2024, W26,185 million transferred from assets-under-construction is included.
[2] During 2023, W82,179 million transferred from assets-under-construction is included.
[3] Included in general administrative expense, other operating income (loss) and insurance service expense of the consolidated statements of comprehensive income.