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Income tax expense - Summary of income tax expense (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Major components of tax expense (income) [abstract]      
Current income tax expense ₩ 1,572,116 ₩ 1,210,083 ₩ 1,301,802
Temporary differences 17,638 (163,840) 493,026
Income tax recognized in other comprehensive income 254,736 424,679 (307,868)
Income tax expenses ₩ 1,844,490 ₩ 1,470,922 ₩ 1,486,960