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Liability under insurance contracts and reinsurance contracts - Summary of coverage elements and occurrence elements of net insurance contract liabilities applying the premium allocation (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets ₩ (5,639)    
Beginning balance - Insurance contract liabilities 51,124,991    
Beginning balance - Net insurance contract liabilities 51,119,352    
Insurance income 3,364,322 ₩ 3,116,553 ₩ 2,899,599
Insurance service expenses - Changes in liabilities for incurred claims 2,321,814 2,131,560 1,748,779
Insurance finance income and expenses - Current profit or loss (1,191,195) (99,439) (516,097)
Insurance finance income and expenses (1,191,195) (99,439) (516,097)
Ending balance - Insurance contract assets (760) (5,639)  
Ending balance - Insurance contract liabilities 50,471,303 51,124,991  
Ending balance - Net insurance contract liabilities 50,470,543 51,119,352  
Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance income 101,942 64,554 39,641
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets (4,588) (10,210)  
Beginning balance - Insurance contract liabilities 161,949 104,666  
Beginning balance - Net insurance contract liabilities 157,361 94,456  
Insurance income (101,942) (64,554)  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 86,764 61,721  
Insurance service expenses - Losses on onerous contracts and reversals 86,764 61,721  
Insurance service expenses - Amortization of insurance acquisition Cash flows 21,827 13,238  
Insurance service expenses - Other   (9)  
Insurance service expenses 120,375 76,395  
Investment components and insurance premium refund 0 0  
Insurance finance income and expenses - Current profit or loss 5,450 4,542  
Insurance finance income and expenses - Other comprehensive income (33) 28  
Insurance finance income and expenses 5,417 4,570  
Cash flow for the period - Insurance premium received 106,466 109,597  
Cash flow for the period - Insurance acquisition cash flow paid (26,637) (19,841)  
Cash flow for the period - Insurance claims and other insurance service expenses paid (90,081) (45,564)  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums (221) (2)  
Cash flow for the period (10,473) 44,190  
Other increases (decreases) 0 2,304  
Ending balance - Insurance contract assets 0 (4,588) (10,210)
Ending balance - Insurance contract liabilities 170,738 161,949 104,666
Ending balance - Net insurance contract liabilities 170,738 157,361 94,456
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Losses on onerous contracts and reversals [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Incurred claims and other incurred insurance service expenses 3,435 (2,185)  
Insurance service expenses - Losses on onerous contracts and reversals 3,435 (2,185)  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Cash Flow Hedges | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims 8,349 3,630  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Present value estimate of future cash flows [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets 1,894 450  
Beginning balance - Insurance contract liabilities 21,756 10,340  
Beginning balance - Net insurance contract liabilities 23,650 10,790  
Insurance income 0 0  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 83,752 61,148  
Insurance service expenses - Losses on onerous contracts and reversals 83,752 61,148  
Insurance service expenses - Amortization of insurance acquisition Cash flows 0 0  
Insurance service expenses - Other   (9)  
Insurance service expenses 92,653 64,348  
Investment components and insurance premium refund 223 2  
Insurance finance income and expenses - Current profit or loss 253 162  
Insurance finance income and expenses - Other comprehensive income (27) 22  
Insurance finance income and expenses 226 184  
Cash flow for the period - Insurance premium received 0 0  
Cash flow for the period - Insurance acquisition cash flow paid 0 0  
Cash flow for the period - Insurance claims and other insurance service expenses paid (90,081) (45,564)  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums (221) (2)  
Cash flow for the period (90,302) (45,566)  
Other increases (decreases) 2 (6,108)  
Ending balance - Insurance contract assets 0 1,894 450
Ending balance - Insurance contract liabilities 26,452 21,756 10,340
Ending balance - Net insurance contract liabilities 26,452 23,650 10,790
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Present value estimate of future cash flows [member] | Losses on onerous contracts and reversals [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Incurred claims and other incurred insurance service expenses 0 0  
Insurance service expenses - Losses on onerous contracts and reversals 0 0  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Present value estimate of future cash flows [member] | Cash Flow Hedges | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims 8,901 3,209  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Risk adjustment for non-financial risks [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets 24 7  
Beginning balance - Insurance contract liabilities 1,944 987  
Beginning balance - Net insurance contract liabilities 1,968 994  
Insurance income 0 0  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 2,475 528  
Insurance service expenses - Losses on onerous contracts and reversals 2,475 528  
Insurance service expenses - Amortization of insurance acquisition Cash flows 0 0  
Insurance service expenses - Other   0  
Insurance service expenses 1,923 949  
Investment components and insurance premium refund 0 0  
Insurance finance income and expenses - Current profit or loss 57 17  
Insurance finance income and expenses - Other comprehensive income (6) 6  
Insurance finance income and expenses 51 23  
Cash flow for the period - Insurance premium received 0 0  
Cash flow for the period - Insurance acquisition cash flow paid 0 0  
Cash flow for the period - Insurance claims and other insurance service expenses paid 0 0  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums 0 0  
Cash flow for the period 0 0  
Other increases (decreases) (2) 2  
Ending balance - Insurance contract assets 0 24 7
Ending balance - Insurance contract liabilities 3,940 1,944 987
Ending balance - Net insurance contract liabilities 3,940 1,968 994
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Risk adjustment for non-financial risks [member] | Losses on onerous contracts and reversals [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Incurred claims and other incurred insurance service expenses 0 0  
Insurance service expenses - Losses on onerous contracts and reversals 0 0  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Risk adjustment for non-financial risks [member] | Cash Flow Hedges | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims (552) 421  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Excluding loss factors [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets (6,506) (10,670)  
Beginning balance - Insurance contract liabilities 135,670 88,524  
Beginning balance - Net insurance contract liabilities 129,164 77,854  
Insurance income (101,942) (64,554)  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 537 45  
Insurance service expenses - Losses on onerous contracts and reversals 537 45  
Insurance service expenses - Amortization of insurance acquisition Cash flows 21,827 13,238  
Insurance service expenses - Other   0  
Insurance service expenses 23,106 13,337  
Investment components and insurance premium refund (223) (2)  
Insurance finance income and expenses - Current profit or loss 5,140 4,363  
Insurance finance income and expenses - Other comprehensive income 0 0  
Insurance finance income and expenses 5,140 4,363  
Cash flow for the period - Insurance premium received 106,466 109,597  
Cash flow for the period - Insurance acquisition cash flow paid (26,637) (19,841)  
Cash flow for the period - Insurance claims and other insurance service expenses paid 0 0  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums 0 0  
Cash flow for the period 79,829 89,756  
Other increases (decreases) 0 8,410  
Ending balance - Insurance contract assets 0 (6,506) (10,670)
Ending balance - Insurance contract liabilities 135,074 135,670 88,524
Ending balance - Net insurance contract liabilities 135,074 129,164 77,854
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Excluding loss factors [member] | Losses on onerous contracts and reversals [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Incurred claims and other incurred insurance service expenses 742 54  
Insurance service expenses - Losses on onerous contracts and reversals 742 54  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Excluding loss factors [member] | Cash Flow Hedges | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims 0 0  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Loss factor [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets 0 3  
Beginning balance - Insurance contract liabilities 2,579 4,815  
Beginning balance - Net insurance contract liabilities 2,579 4,818  
Insurance income 0 0  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 0 0  
Insurance service expenses - Losses on onerous contracts and reversals 0 0  
Insurance service expenses - Amortization of insurance acquisition Cash flows 0 0  
Insurance service expenses - Other   0  
Insurance service expenses 2,693 (2,239)  
Investment components and insurance premium refund 0 0  
Insurance finance income and expenses - Current profit or loss 0 0  
Insurance finance income and expenses - Other comprehensive income 0 0  
Insurance finance income and expenses 0 0  
Cash flow for the period - Insurance premium received 0 0  
Cash flow for the period - Insurance acquisition cash flow paid 0 0  
Cash flow for the period - Insurance claims and other insurance service expenses paid 0 0  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums 0 0  
Cash flow for the period 0 0  
Other increases (decreases) 0 0  
Ending balance - Insurance contract assets 0 0 3
Ending balance - Insurance contract liabilities 5,272 2,579 4,815
Ending balance - Net insurance contract liabilities 5,272 2,579 ₩ 4,818
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Loss factor [member] | Losses on onerous contracts and reversals [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Incurred claims and other incurred insurance service expenses 2,693 (2,239)  
Insurance service expenses - Losses on onerous contracts and reversals 2,693 (2,239)  
Net Insurance Contract Liabilities Applying The Premium Allocation Approach [Member] | Remaining coverage elements - Loss factor [member] | Cash Flow Hedges | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And occured Elements Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims ₩ 0 ₩ 0