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Liability under insurance contracts and reinsurance contracts - Summary of fair value amounts of basic items of insurance contracts (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts ₩ 4,469,969 ₩ 3,958,036
Cash and amortized cost measurement deposits    
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts 371,582 294,963
Financial assets measured at FVTPL    
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts 4,004,935 3,561,126
Amortized cost loan receivables    
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts 40,245 32,489
Derivatives    
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts 429 (150)
Other    
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items]    
Fair value amounts of basic items of insurance contracts ₩ 52,778 ₩ 69,608