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Intangible assets - Key assumptions used in the discounted cash flow calculations of CGUs (Details)
Dec. 31, 2025
Other Than Life insurance [Member] | CPI growth [Member] | 2025 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Other Than Life insurance [Member] | CPI growth [Member] | 2026 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.70%
Other Than Life insurance [Member] | CPI growth [Member] | 2027 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.80%
Other Than Life insurance [Member] | CPI growth [Member] | 2028 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Other Than Life insurance [Member] | CPI growth [Member] | 2029 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.90%
Other Than Life insurance [Member] | CPI growth [Member] | 2030 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.90%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2025 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 0.80%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2026 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.10%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2027 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.60%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2028 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.90%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2029 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Other Than Life insurance [Member] | Private Consumption Growth [Member] | 2030 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2025 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 0.80%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2026 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.40%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2027 [member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 1.70%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2028 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.00%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2029 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Other Than Life insurance [Member] | Real GDP Growth [Member] | 2030 [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.10%
Life Insurance Component [Member] | Consumer price index growth rate (Bank of Korea) [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 2.00%
Life Insurance Component [Member] | Risk-based confidence level (%) [Member]  
Disclosure of information for cash-generating units [line items]  
Key Assumptions Used In The Discounted Cash Flow Projections Of Cash Generating Units, Rate 99.50%