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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
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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 |

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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from additional items that may be necessary to understand the change in the net carrying amount of the insurance contracts. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_d&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from amortisation of insurance acquisition cash flows. [Refer: Insurance contracts liability (asset); Increase (decrease) through insurance acquisition cash flows, insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 103 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103_b_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from cash flows. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from incurred claims and other incurred insurance service expenses. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 103 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103_b_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from incurred claims paid and other insurance service expenses paid for insurance contracts issued, excluding insurance acquisition cash flows. [Refer: Insurance contracts liability (asset); Increase (decrease) through insurance acquisition cash flows, insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_a_iii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance acquisition cash flows. Insurance acquisition cash flows are cash flows arising from the costs of selling, underwriting and starting a group of insurance contracts (issued or expected to be issued) that are directly attributable to the portfolio of insurance contracts to which the group belongs. Such cash flows include cash flows that are not directly attributable to individual contracts or groups of insurance contracts within the portfolio. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance service expenses. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 103 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from investment components excluded from insurance revenue and insurance service expenses (combined with refunds of premiums unless refunds of premiums are presented as part of the cash flows in the period described in paragraph 105(a)(i) of IFRS 17). [Refer: Description of approach used to determine investment components; Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 103 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from premiums received for insurance contracts issued. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts liability (asset). [Refer: Assets; Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts that are assets. [Refer: Assets; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts that are liabilities. [Refer: Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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