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Financial risk management - Summary of the capital adequacy ratio of the Group (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]    
Common Equity Tier 1 capital ₩ 47,115,338 ₩ 44,562,500
Additional tier 1 capital 5,890,967 5,824,082
Total Tier I capital 53,006,305 50,386,582
Tier II capital 3,254,292 3,516,787
Total capital (A) 56,260,597 53,903,369
Total risk-weighted assets (B) ₩ 352,907,638 ₩ 342,375,264
Total capital ratio (A/B) 15.94% 15.74%
Tier 1 capital ratio 15.02% 14.72%
Common Equity Tier 1 capital ratio 13.35% 13.02%