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Provisions - Changes in Provisions (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of other provisions [line items]    
Beginning ₩ 976,589 ₩ 887,753
Increase 665,530 617,053
Business combination 138,212  
Utilization (226,574) (408,112)
Reversal (97,651) (140,753)
Others (234,129) 20,648
Ending 1,221,977 976,589
Provision for bonus payments [member]    
Disclosure of other provisions [line items]    
Beginning 191,861 184,391
Increase 159,990 224,339
Utilization (133,528) (187,004)
Reversal (2,634) (29,461)
Others 4,360 (404)
Ending 220,049 191,861
Provision for construction warranties [member]    
Disclosure of other provisions [line items]    
Beginning 186,860 196,758
Increase 43,891 53,244
Utilization (35,139) (48,471)
Reversal (6,005) (8,274)
Others (1,541) (6,397)
Ending 188,066 186,860
Provision for legal contingencies and claims [member]    
Disclosure of other provisions [line items]    
Beginning 96,446 73,062
Increase 10,856 54,929
Utilization (23,507) (12,964)
Reversal (15,782) (19,743)
Others (16,965) 1,162
Ending 51,048 96,446
Provisions for the restoration [member]    
Disclosure of other provisions [line items]    
Beginning 207,851 175,820
Increase 26,853 28,917
Utilization (4,953) (8,311)
Reversal (4,843) (6,485)
Others (25,278) 17,910
Ending 199,630 207,851
Others [member]    
Disclosure of other provisions [line items]    
Beginning 293,571 257,722
Increase 423,940 255,624
Business combination 138,212  
Utilization (29,447) (151,362)
Reversal (68,387) (76,790)
Others (194,705) 8,377
Ending ₩ 563,184 ₩ 293,571