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Selling and Administrative Expenses - Summary of Other Administrative Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of comprehensive income [Line Items]      
Wages and salaries ₩ 4,878,407 ₩ 4,769,925 ₩ 4,375,123
Expenses related to post-employment benefits 264,232 246,823 206,614
Depreciation 3,693,288 3,530,770 3,346,461
Amortization 465,935 453,689 498,193
Research & development 527,179 555,560 518,409
Vehicles maintenance 2,444,069 2,594,589 2,297,544
Total administrative expenses 3,094,810 3,004,478 2,651,902
Administrative expenses [member]      
Statement of comprehensive income [Line Items]      
Wages and salaries 1,323,637 1,212,005 1,156,456
Expenses related to post-employment benefits 100,701 136,211 92,667
Other employee benefits 305,212 300,425 273,482
Travel 54,993 47,681 47,945
Depreciation 177,151 173,507 159,836
Amortization 116,416 113,130 96,004
Communication 13,218 13,472 11,956
Electricity 17,192 15,618 12,242
Taxes and public dues 99,535 94,658 100,639
Rental 37,847 45,440 48,243
Repairs 11,684 16,502 17,787
Entertainment 13,402 13,993 15,490
Advertising 95,532 102,271 107,223
Research & development 195,255 207,557 175,167
Service fees 234,441 268,701 234,815
Vehicles maintenance 7,632 7,880 7,660
Industry association fee 13,877 12,578 11,096
Conference 23,475 22,797 19,876
Bad debt expenses (reversal) 168,960 134,230 (17,785)
Others 84,650 65,822 81,103
Total administrative expenses ₩ 3,094,810 ₩ 3,004,478 ₩ 2,651,902