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Liability under insurance contracts and reinsurance contracts - Summary of measurement element in net insurance contract liabilities without applying the premium allocation approach (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [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
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 Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [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
Changes in estimates adjusting the contractual service margin	1	0
Changes in estimates not adjusting the contractual service margin	(28,512)	40,294
Effect of initial recognition of new contracts	32,646	27,640
Changes related to future services	4,135	67,934
Amortization of contractual service margin	(913,213)	(923,714)
Change in risk adjustment	(173,450)	(119,568)
Experience adjustment	48,316	(49,668)
Changes related to current services	(1,038,347)	(1,092,950)
Changes related to past services	(26,729)	28,182
Profit or loss	2,852,532	1,779,260
Other comprehensive income	(1,748,594)	3,171,458
Insurance finance income and expenses	1,103,938	4,950,718
Insurance premium received	7,797,683	6,897,049
Insurance acquisition cash flow payment	(2,062,604)	(1,586,104)
Insurance claims and other insurance service expenses paid	(1,746,506)	(1,590,554)
Receipt (payment) of investment elements 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
Insurance contracts other than those to which premium allocation approach has been applied [member] | Present value estimate of future cash flows [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	(1,325)	(743)
Beginning balance - Insurance contract liabilities	39,847,061	37,213,497
Beginning balance - Net insurance contract liabilities	39,845,736	37,212,754
Changes in estimates adjusting the contractual service margin	927,177	685,902
Changes in estimates not adjusting the contractual service margin	(34,340)	39,452
Effect of initial recognition of new contracts	(1,841,928)	(1,395,897)
Changes related to future services	(949,091)	(670,543)
Amortization of contractual service margin	0	0
Change in risk adjustment	0	0
Experience adjustment	48,316	(49,668)
Changes related to current services	48,316	(49,668)
Changes related to past services	(15,614)	44,341
Profit or loss	2,452,814	1,399,565
Other comprehensive income	(1,719,959)	3,130,302
Insurance finance income and expenses	732,855	4,529,867
Insurance premium received	7,797,683	6,897,049
Insurance acquisition cash flow payment	(2,062,604)	(1,586,104)
Insurance claims and other insurance service expenses paid	(1,746,506)	(1,590,554)
Receipt (payment) of investment elements and refund of insurance premiums	(4,693,623)	(4,941,397)
Cash flow for the period	(705,050)	(1,221,006)
Other increases (decreases)	44	(9)
Ending balance - Insurance contract assets	(1,336)	(1,325)	(743)
Ending balance - Insurance contract liabilities	38,958,532	39,847,061	37,213,497
Ending balance - Net insurance contract liabilities	38,957,196	39,845,736	37,212,754
Insurance contracts other than those to which premium allocation approach has been applied [member] | Risk adjustment for non-financial risks [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	203	124
Beginning balance - Insurance contract liabilities	1,346,719	1,151,534
Beginning balance - Net insurance contract liabilities	1,346,922	1,151,658
Changes in estimates adjusting the contractual service margin	(20,510)	90,882
Changes in estimates not adjusting the contractual service margin	5,828	382
Effect of initial recognition of new contracts	224,776	157,279
Changes related to future services	210,094	248,543
Amortization of contractual service margin	0	0
Change in risk adjustment	(173,450)	(119,568)
Experience adjustment	0	0
Changes related to current services	(173,450)	(119,568)
Changes related to past services	(11,115)	(16,159)
Profit or loss	55,416	41,292
Other comprehensive income	(28,635)	41,156
Insurance finance income and expenses	26,781	82,448
Insurance premium received	0	0
Insurance acquisition cash flow payment	0	0
Insurance claims and other insurance service expenses paid	0	0
Receipt (payment) of investment elements and refund of insurance premiums	0	0
Cash flow for the period	0	0
Other increases (decreases)	(35)	0
Ending balance - Insurance contract assets	407	203	124
Ending balance - Insurance contract liabilities	1,398,790	1,346,719	1,151,534
Ending balance - Net insurance contract liabilities	1,399,197	1,346,922	1,151,658
Insurance contracts other than those to which premium allocation approach has been applied [member] | Retrospective method [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	0	0
Beginning balance - Insurance contract liabilities	4,848,662	5,772,838
Beginning balance - Net insurance contract liabilities	4,848,662	5,772,838
Changes in estimates adjusting the contractual service margin	(394,416)	(663,935)
Changes in estimates not adjusting the contractual service margin	0	0
Effect of initial recognition of new contracts	0	0
Changes related to future services	(394,416)	(663,935)
Amortization of contractual service margin	(357,104)	(433,780)
Change in risk adjustment	0	0
Experience adjustment	0	0
Changes related to current services	(357,104)	(433,780)
Changes related to past services	0	0
Profit or loss	146,242	173,539
Other comprehensive income	0	0
Insurance finance income and expenses	146,242	173,539
Insurance premium received	0	0
Insurance acquisition cash flow payment	0	0
Insurance claims and other insurance service expenses paid	0	0
Receipt (payment) of investment elements 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	0
Ending balance - Insurance contract liabilities	4,243,384	4,848,662	5,772,838
Ending balance - Net insurance contract liabilities	4,243,384	4,848,662	5,772,838
Insurance contracts other than those to which premium allocation approach has been applied [member] | Fair value method [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	0	0
Beginning balance - Insurance contract liabilities	2,876,232	2,782,796
Beginning balance - Net insurance contract liabilities	2,876,232	2,782,796
Changes in estimates adjusting the contractual service margin	123,371	257,316
Changes in estimates not adjusting the contractual service margin	0	0
Effect of initial recognition of new contracts	0	0
Changes related to future services	123,371	257,316
Amortization of contractual service margin	(253,829)	(246,990)
Change in risk adjustment	0	0
Experience adjustment	0	0
Changes related to current services	(253,829)	(246,990)
Changes related to past services	0	0
Profit or loss	90,559	83,110
Other comprehensive income	0	0
Insurance finance income and expenses	90,559	83,110
Insurance premium received	0	0
Insurance acquisition cash flow payment	0	0
Insurance claims and other insurance service expenses paid	0	0
Receipt (payment) of investment elements 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	0
Ending balance - Insurance contract liabilities	2,836,333	2,876,232	2,782,796
Ending balance - Net insurance contract liabilities	2,836,333	2,876,232	2,782,796
Insurance contracts other than those to which premium allocation approach has been applied [member] | Other [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	71	175
Beginning balance - Insurance contract liabilities	2,044,368	1,308,901
Beginning balance - Net insurance contract liabilities	2,044,439	1,309,076
Changes in estimates adjusting the contractual service margin	(635,621)	(370,165)
Changes in estimates not adjusting the contractual service margin	0	460
Effect of initial recognition of new contracts	1,649,798	1,266,258
Changes related to future services	1,014,177	896,553
Amortization of contractual service margin	(302,280)	(242,944)
Change in risk adjustment	0	0
Experience adjustment	0	0
Changes related to current services	(302,280)	(242,944)
Changes related to past services	0	0
Profit or loss	107,501	81,754
Other comprehensive income	0	0
Insurance finance income and expenses	107,501	81,754
Insurance premium received	0	0
Insurance acquisition cash flow payment	0	0
Insurance claims and other insurance service expenses paid	0	0
Receipt (payment) of investment elements and refund of insurance premiums	0	0
Cash flow for the period	0	0
Other increases (decreases)	(142)	0
Ending balance - Insurance contract assets	169	71	175
Ending balance - Insurance contract liabilities	2,863,526	2,044,368	1,308,901
Ending balance - Net insurance contract liabilities	2,863,695	2,044,439	1,309,076
Insurance contracts other than those to which premium allocation approach has been applied [member] | Sub-total [member]
Disclosure Of Changes By Measurement Element In Net Insurance Contract Liabilities Without Applying The Premium Allocation Approach [Line Items]
Beginning balance - Insurance contract assets	71	175
Beginning balance - Insurance contract liabilities	9,769,262	9,864,535
Beginning balance - Net insurance contract liabilities	9,769,333	9,864,710
Changes in estimates adjusting the contractual service margin	(906,666)	(776,784)
Changes in estimates not adjusting the contractual service margin	0	460
Effect of initial recognition of new contracts	1,649,798	1,266,258
Changes related to future services	743,132	489,934
Amortization of contractual service margin	(913,213)	(923,714)
Change in risk adjustment	0	0
Experience adjustment	0	0
Changes related to current services	(913,213)	(923,714)
Changes related to past services	0	0
Profit or loss	344,302	338,403
Other comprehensive income	0	0
Insurance finance income and expenses	344,302	338,403
Insurance premium received	0	0
Insurance acquisition cash flow payment	0	0
Insurance claims and other insurance service expenses paid	0	0
Receipt (payment) of investment elements and refund of insurance premiums	0	0
Cash flow for the period	0	0
Other increases (decreases)	(142)	0
Ending balance - Insurance contract assets	169	71	175
Ending balance - Insurance contract liabilities	9,943,243	9,769,262	9,864,535
Ending balance - Net insurance contract liabilities	₩ 9,943,412	₩ 9,769,333	₩ 9,864,710

X

- 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
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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
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from the change in the risk adjustment for non-financial risk that does not relate to future service or past service. [Refer: Insurance contracts liability (asset); Risk adjustment for non-financial risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2025-01-01
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from changes in estimates that adjust the contractual service margin. [Refer: Insurance contracts liability (asset); Contractual service margin [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from changes in estimates that do not adjust the contractual service margin. [Refer: Insurance contracts liability (asset); Contractual service margin [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from changes that relate to current service. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from changes that relate to future service. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-Paragraph 103
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-Name IFRS
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from changes that relate to past service, ie changes in fulfilment cash flows relating to incurred claims. [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 iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103_b_iii&doctype=Standard
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-Name IFRS
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from the effects of contracts initially recognised in the period. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2025-01-01
-Paragraph 107
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_107&doctype=Standard
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-Name IFRS
-Number 17
-IssueDate 2025-01-01
-Paragraph 104
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from experience adjustments, excluding amounts related to the risk adjustment for non-financial risk included in paragraph 104(b)(ii) of IFRS 17. Experience adjustment is a difference between: (a) for premium receipts (and any related cash flows such as insurance acquisition cash flows and insurance premium taxes) - the estimate at the beginning of the period of the amounts expected in the period and the actual cash flows in the period; or (b) for insurance service expenses (excluding insurance acquisition expenses) - the estimate at the beginning of the period of the amounts expected to be incurred in the period and the actual amounts incurred in the period. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2025-01-01
-Paragraph 104
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_104_b_iii&doctype=Standard
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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
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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
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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
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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
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from recognition of the contractual service margin in profit or loss to reflect the transfer of services. [Refer: Insurance contracts liability (asset); Contractual service margin [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2025-01-01
-Paragraph 104
-Subparagraph b
-Clause i
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The amount of insurance contracts liability (asset). [Refer: Assets; Liabilities; Insurance contracts [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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
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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
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-IssueDate 2025-01-01
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- References

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-Name IFRS
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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2025-03-27

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-URIDate 2025-03-27

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- Definition

Disclosure of changes by measurement element in net insurance contract liabilities without applying the premium allocation approach line item.

+ References

No definition available.

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