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Insurance Risk - Summary of changes in major assumptions on Interest rate risk insurance contract liabilities (assets) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Interest rate risk [member] | Financial assets at fair value through profit or loss |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect | [1] | ₩ (26,466) | ₩ (35,934)
Decrease in Profit and Loss Effect | [1] | 26,563 | 35,934
Interest rate risk [member] | Financial assets at fair value through other comprehensive income |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Capital Effect | [1] | (4,736,892) | (4,777,699)
Decrease in Capital Effect | [1] | 5,800,791 | 5,837,965
Interest rate risk [member] | Insurance contracts [member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | 0 | 0
Decrease in Profit and Loss Effect |  | 0 | 0
Increase in Capital Effect |  | 5,066,153 | 4,357,244
Decrease in Capital Effect |  | (6,484,658) | (6,073,734)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Participating [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect | [2] | 0 | 0
Decrease in Profit and Loss Effect | [2] | 0 | 0
Increase in Capital Effect | [2] | 509,420 | 539,618
Decrease in Capital Effect | [2] | (620,972) | (658,212)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Non Participating [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect | [2] | 0 | 0
Decrease in Profit and Loss Effect | [2] | 0 | 0
Increase in Capital Effect | [2] | 4,535,425 | 3,772,927
Decrease in Capital Effect | [2] | (5,802,811) | (5,332,780)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Variable [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect | [2] | 0 | 0
Decrease in Profit and Loss Effect | [2] | 0 | 0
Increase in Capital Effect | [2] | 21,308 | 44,699
Decrease in Capital Effect | [2] | (60,875) | (82,742)
Interest rate risk [member] | Reinsurance Contract [member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect | [2] | 0 | 0
Decrease in Profit and Loss Effect | [2] | 0 | 0
Increase in Capital Effect | [2] | 255,489 | 50,365
Decrease in Capital Effect | [2] | (308,842) | (59,948)
Equity price risk [member] | Financial assets at fair value through profit or loss |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | 255,595 | 193,578
Decrease in Profit and Loss Effect |  | (255,595) | (193,578)
Equity price risk [member] | Financial assets at fair value through other comprehensive income |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | 0 | 0
Equity price risk [member] | Insurance contracts [member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | (255,595) | (193,578)
Decrease in Profit and Loss Effect |  | 255,595 | 193,578
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | 0 | 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Participating [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | 0 | 0
Decrease in Profit and Loss Effect |  | 0 | 0
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | 0 | 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Non Participating [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | 0 | 0
Decrease in Profit and Loss Effect |  | 0 | 0
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | 0 | 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Variable [Member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | (255,595) | (193,578)
Decrease in Profit and Loss Effect |  | 255,595 | 193,578
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | 0 | 0
Equity price risk [member] | Reinsurance Contract [member] |  |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |  |
Increase in Profit and Loss Effect |  | 0 | 0
Decrease in Profit and Loss Effect |  | 0 | 0
Increase in Capital Effect |  | 0 | 0
Decrease in Capital Effect |  | ₩ 0 | ₩ 0
[1] | It is the total amount of financial assets measured at fair value through profit or loss, financial assets measured at fair value through other comprehensive income, and derivative assets (liabilities).
[2] | This is the impact on equity (before tax) due to changes in expected cash flows of insurance and reinsurance contracts, excluding variable annuities/savings.

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- Definition The increase (decrease) in equity, before mitigation by reinsurance contracts held, that would have been caused by a reasonably possible decrease in the risk variable that arises from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 128 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in equity, before mitigation by reinsurance contracts held, that would have been caused by a reasonably possible increase in the risk variable that arises from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 128 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in profit (loss), before mitigation by reinsurance contracts held, that would have been caused by a reasonably possible decrease in the risk variable that arises from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 128 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in profit (loss) that would have been caused by a reasonably possible increase in the risk variable that arises from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 128 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 128 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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