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Operating Segments - Reconciliation of Segment Revenues, Profit or Loss, Assets and Liabilities and Other Significant Items (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]      
Revenue ₩ 68,986,938 ₩ 73,459,408 ₩ 77,056,549
Profit before income taxes 1,139,158 1,326,230 2,635,426
Assets 105,287,678 103,443,735  
Liabilities 42,894,966 42,000,967  
Interest income 533,307 576,782 502,147
Interest expenses (1,091,462) (1,051,511) (1,001,290)
Depreciation and amortization (4,159,223) (3,984,460) (3,823,280)
Share of profit of equity-accounted investees, net 349,910 (256,458) 269,678
Income tax expense (612,135) (320,954) (789,367)
Impairment loss on property, plant and equipment and others (194,984) (673,755) (405,753)
Other significant items (5,174,587) (5,710,356) (5,247,865)
Goodwill and corporate FV adjustments [member]      
Disclosure of operating segments [line items]      
Profit before income taxes (65,966) (64,791) 172,493
Assets 2,943,006 2,543,165  
Interest expenses 0 0 0
Depreciation and amortization (80,920) (86,358) (99,347)
Share of profit of equity-accounted investees, net 0 (50)  
Income tax expense 14,954 21,668 46,116
Impairment loss on property, plant and equipment and others 0 (282)  
Other significant items (65,966) (65,022) (53,231)
Income tax expense [member]      
Disclosure of operating segments [line items]      
Profit before income taxes 602,446 303,623 789,305
Corporate FV adjustments [member]      
Disclosure of operating segments [line items]      
Liabilities 211,742 221,537  
Basis difference [member]      
Disclosure of operating segments [line items]      
Revenue [1] (107,948) 771,265 (70,648)
Profit before income taxes [1] 32,308 75,027 272
Assets [2] 95,240 39,536  
Liabilities [1] 80,219 47,136  
Income tax expense (9,689) [2] (17,331) [1] (62) [2]
Other significant items (9,689) [2] (17,331) [1] (62) [2]
Total Assets [Member]      
Disclosure of operating segments [line items]      
Assets 105,287,678 103,443,735  
Total Liabilities [Member]      
Disclosure of operating segments [line items]      
Liabilities 42,894,966 42,000,967  
Reportable segments [member]      
Disclosure of operating segments [line items]      
Revenue 117,240,806 125,013,953 127,080,006
Profit before income taxes 1,124,885 2,099,066 2,911,247
Assets [3] 170,842,653 165,497,714  
Liabilities [3] 54,801,990 53,072,062  
Interest income 653,047 662,099 577,336
Interest expenses (1,305,023) (1,285,679) (1,180,096)
Depreciation and amortization (4,261,180) (4,058,664) (3,845,492)
Share of profit of equity-accounted investees, net (340,764) (1,137,480) (383,220)
Income tax expense (657,907) (294,895) (842,059)
Impairment loss on property, plant and equipment and others (205,536) (660,275) (409,552)
Other significant items (6,117,363) (6,774,894) (6,083,083)
Equity-accounted investees [member]      
Disclosure of operating segments [line items]      
Assets (54,163,800) (50,775,491)  
Elimination of inter-segment amounts [member]      
Disclosure of operating segments [line items]      
Revenue (48,145,920) (52,325,810) (49,952,809)
Profit before income taxes (554,515) (1,086,695) (1,237,891)
Assets (14,429,421) (13,861,189)  
Liabilities (12,198,985) (11,339,768)  
Interest income (119,740) (85,317) (75,189)
Interest expenses 213,561 234,168 178,807
Depreciation and amortization 182,877 160,562 121,559
Share of profit of equity-accounted investees, net 690,674 881,072 652,898
Income tax expense 40,507 (30,396) 6,638
Impairment loss on property, plant and equipment and others 10,552 (13,198) 3,799
Other significant items ₩ 1,018,431 ₩ 1,146,891 ₩ 888,512
[1] Basis difference is related to the differences in recorded revenue and expenses for development and sale of certain residential real estates between the report reviewed by management and the consolidated financial statements.
[2] Basis difference is related to the differences in recorded revenue and expenses for development and sale of certain residential real estates and other items between the report reviewed by management and the consolidated financial statements.
[3] As segment assets and liabilities are determined based on separate financial statements, the carrying amount of assets of subsidiaries, which are in a different segment from that of their immediate parent company, in the separate financial statements the immediate parent company is eliminated upon consolidation. In addition, the amount of investment in associates and joint ventures are adjusted from the amount reflected in segment assets to that determined using equity method in consolidated financial statements.