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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
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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%

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- Definition Capital adequacy ratio. + References No definition available. + Details
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- Definition Common equity capital adequacy ratio. + References No definition available. + Details
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- Definition Tier I capital adequacy ratio. + References No definition available. + Details
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- Definition Tier II capital. + References No definition available. + Details
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- Definition Total risk-weighted assets. + References No definition available. + Details
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