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Leases - Summary of the changes in the right-of-use assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Summary of the changes in the right-of-use assets [Line Items]    
Beginning balance ₩ 4,157,592 ₩ 3,972,304
Disposals (68,928) [1] (57,580) [2]
Depreciation [3] (598,890) (596,443)
Impairment loss recognized 923 1,650
Effects of foreign currency adjustments 2,158 27,060
Effects of business combinations 127,968  
Ending balance 4,153,186 4,157,592
Right-of-use assets    
Summary of the changes in the right-of-use assets [Line Items]    
Beginning balance 875,250 606,475
Acquisitions 289,866 624,103
Disposals (63,119) (45,452)
Depreciation [4] (334,935) (329,946)
Impairment loss recognized   53
Effects of foreign currency adjustments 961 20,017
Effects of business combinations 4  
Ending balance 768,027 875,250
Real estate | Right-of-use assets    
Summary of the changes in the right-of-use assets [Line Items]    
Beginning balance 836,925 566,941
Acquisitions 271,932 601,686
Disposals (57,574) (40,522)
Depreciation [4] (317,022) (311,077)
Impairment loss recognized   53
Effects of foreign currency adjustments 1,153 19,844
Effects of business combinations 0  
Ending balance 735,414 836,925
Vehicle | Right-of-use assets    
Summary of the changes in the right-of-use assets [Line Items]    
Beginning balance 25,993 28,417
Acquisitions 13,205 15,454
Disposals (4,788) (4,222)
Depreciation [4] (13,060) (13,843)
Impairment loss recognized   0
Effects of foreign currency adjustments (232) 187
Effects of business combinations 4  
Ending balance 21,122 25,993
Others | Right-of-use assets    
Summary of the changes in the right-of-use assets [Line Items]    
Beginning balance 12,332 11,117
Acquisitions 4,729 6,963
Disposals (757) (708)
Depreciation [4] (4,853) (5,026)
Impairment loss recognized   0
Effects of foreign currency adjustments 40 (14)
Effects of business combinations 0  
Ending balance ₩ 11,491 ₩ 12,332
[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.
[4] Included in general administrative expense, other operating expense and insurance service expense of the consolidated statements of comprehensive income.