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Liability under insurance contracts and reinsurance contracts - Summary of changes in the remaining coverage elements and occurrence elements of net insurance contract liabilities (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 Occurred Elements Did Not 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 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 other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets (1,051) (444)  
Beginning balance - Insurance contract liabilities 50,963,042 48,229,566  
Beginning balance - Net insurance contract liabilities 50,961,991 48,229,122  
Insurance income - Retroactive modification method (1,252,936) (1,354,769)  
Insurance income - fair value law method (955,369) (968,200)  
Insurance income - Etc. (1,054,075) (729,030)  
Insurance income (3,262,380) (3,051,999)  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 1,829,232 1,646,968  
Insurance service expenses - Amortization of insurance acquisition Cash flows 422,286 360,411  
Insurance service expenses - Other (27,485) (48,330)  
Insurance service expenses 2,201,439 2,055,165  
Investment components and insurance premium refund 0 0  
Insurance finance income and expenses - Current profit or loss 2,852,532 1,779,260  
Insurance finance income and expenses - Other comprehensive income (1,748,594) 3,171,458  
Insurance finance income and expenses 1,103,938 4,950,718  
Cash flow for the period - Insurance premium received 7,797,683 6,897,049  
Cash flow for the period - Insurance acquisition cash flow paid (2,062,604) (1,586,104)  
Cash flow for the period - Insurance claims and other insurance service expenses paid (1,746,506) (1,590,554)  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums (4,693,623) (4,941,397)  
Cash flow for the period (705,050) (1,221,006)  
Other increases (decreases) (133) (9)  
Ending balance - Insurance contract assets (760) (1,051) (444)
Ending balance - Insurance contract liabilities 50,300,565 50,963,042 48,229,566
Ending balance - Net insurance contract liabilities 50,299,805 50,961,991 48,229,122
Losses on onerous contracts and reversals [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Losses on onerous contracts and reversals 4,135 67,934  
Cash Flow Hedges | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims (26,729) 28,182  
Remaining coverage elements - Excluding loss factors [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets (1,266) (493)  
Beginning balance - Insurance contract liabilities 48,154,718 45,517,567  
Beginning balance - Net insurance contract liabilities 48,153,452 45,517,074  
Insurance income - Retroactive modification method (1,252,936) (1,354,769)  
Insurance income - fair value law method (955,369) (968,200)  
Insurance income - Etc. (1,054,075) (730,549)  
Insurance income (3,262,380) (3,053,518)  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 0 0  
Insurance service expenses - Amortization of insurance acquisition Cash flows 422,286 360,411  
Insurance service expenses - Other (9,198) (28,208)  
Insurance service expenses 413,088 332,203  
Investment components and insurance premium refund (4,557,494) (4,769,963)  
Insurance finance income and expenses - Current profit or loss 2,769,151 1,697,955  
Insurance finance income and expenses - Other comprehensive income (1,723,260) 3,125,467  
Insurance finance income and expenses 1,045,891 4,823,422  
Cash flow for the period - Insurance premium received 7,797,683 6,897,049  
Cash flow for the period - Insurance acquisition cash flow paid (2,062,604) (1,586,104)  
Cash flow for the period - Insurance claims and other insurance service expenses paid (6,178) (6,708)  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums 0 0  
Cash flow for the period 5,728,901 5,304,237  
Other increases (decreases) 30 (3)  
Ending balance - Insurance contract assets (1,672) (1,266) (493)
Ending balance - Insurance contract liabilities 47,523,160 48,154,718 45,517,567
Ending balance - Net insurance contract liabilities 47,521,488 48,153,452 45,517,074
Remaining coverage elements - Excluding loss factors [member] | Losses on onerous contracts and reversals [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Losses on onerous contracts and reversals 0 0  
Remaining coverage elements - Excluding loss factors [member] | Cash Flow Hedges | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims 0 0  
Remaining coverage elements - Loss factor [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets 0 0  
Beginning balance - Insurance contract liabilities 993,409 884,042  
Beginning balance - Net insurance contract liabilities 993,409 884,042  
Insurance income - Retroactive modification method 0 0  
Insurance income - fair value law method 0 0  
Insurance income - Etc. 0 1,501  
Insurance income 0 1,501  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 0 0  
Insurance service expenses - Amortization of insurance acquisition Cash flows 0 0  
Insurance service expenses - Other (18,287) (20,122)  
Insurance service expenses (14,152) 47,812  
Investment components and insurance premium refund 0 0  
Insurance finance income and expenses - Current profit or loss 21,373 17,375  
Insurance finance income and expenses - Other comprehensive income (25,851) 42,685  
Insurance finance income and expenses (4,478) 60,060  
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) (160) (6)  
Ending balance - Insurance contract assets 0 0 0
Ending balance - Insurance contract liabilities 974,619 993,409 884,042
Ending balance - Net insurance contract liabilities 974,619 993,409 884,042
Remaining coverage elements - Loss factor [member] | Losses on onerous contracts and reversals [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Losses on onerous contracts and reversals 4,135 67,934  
Remaining coverage elements - Loss factor [member] | Cash Flow Hedges | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims 0 0  
Accident factors that occur [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Beginning balance - Insurance contract assets 215 49  
Beginning balance - Insurance contract liabilities 1,814,915 1,827,957  
Beginning balance - Net insurance contract liabilities 1,815,130 1,828,006  
Insurance income - Retroactive modification method 0 0  
Insurance income - fair value law method 0 0  
Insurance income - Etc. 0 18  
Insurance income 0 18  
Insurance service expenses - Incurred claims and other incurred insurance service expenses 1,829,232 1,646,968  
Insurance service expenses - Amortization of insurance acquisition Cash flows 0 0  
Insurance service expenses - Other 0 0  
Insurance service expenses 1,802,503 1,675,150  
Investment components and insurance premium refund 4,557,494 4,769,963  
Insurance finance income and expenses - Current profit or loss 62,008 63,930  
Insurance finance income and expenses - Other comprehensive income 517 3,306  
Insurance finance income and expenses 62,525 67,236  
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 (1,740,328) (1,583,846)  
Cash flow for the period - Receipt (payment) of investment components and refund of insurance premiums (4,693,623) (4,941,397)  
Cash flow for the period (6,433,951) (6,525,243)  
Other increases (decreases) (3) 0  
Ending balance - Insurance contract assets 912 215 49
Ending balance - Insurance contract liabilities 1,802,786 1,814,915 1,827,957
Ending balance - Net insurance contract liabilities 1,803,698 1,815,130 ₩ 1,828,006
Accident factors that occur [member] | Losses on onerous contracts and reversals [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Losses on onerous contracts and reversals 0 0  
Accident factors that occur [member] | Cash Flow Hedges | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure Of Reconciliation Of Changes In Insurance Contracts By Remaining Coverage And Occurred Elements Did Not Apply Premium Distribution [Line Items]      
Insurance service expenses - Changes in liabilities for incurred claims ₩ (26,729) ₩ 28,182