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Leases - Summary of gross investment and present value of minimum lease payment of finance lease (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	₩ 2,402,502	₩ 2,283,180
Unrealized interest income	259,498	251,717
Present value of minimum lease payment	2,143,004	2,031,463
Less than 1 year [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	718,515	655,270
Unrealized interest income	119,989	116,496
Present value of minimum lease payment	598,526	538,774
1~2 years [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	641,935	580,993
Unrealized interest income	73,116	75,359
Present value of minimum lease payment	568,819	505,634
2~3 years [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	442,923	520,285
Unrealized interest income	40,645	36,203
Present value of minimum lease payment	402,278	484,082
3~4 years [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	351,421	305,670
Unrealized interest income	16,236	13,301
Present value of minimum lease payment	335,185	292,369
4~5 years [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	243,782	217,104
Unrealized interest income	9,503	10,347
Present value of minimum lease payment	234,279	206,757
Later than 5 years [member]
Gross investment and present value of minimum lease payment of finance lease [Line Items]
Gross investment	3,926	3,858
Unrealized interest income	9	11
Present value of minimum lease payment	₩ 3,917	₩ 3,847

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- Definition

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+ References

No definition available.

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- Definition

The gross investment in the finance lease discounted at the interest rate implicit in the lease. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. Gross investment in the finance lease is the sum of: (a) the lease payments receivable by a lessor under a finance lease; and (b) any unguaranteed residual value accruing to the lessor. Interest rate implicit in the lease is the rate of interest that causes the present value of (a) the lease payments and (b) the unguaranteed residual value to equal to the sum of (i) the fair value of the underlying asset and (ii) the initial direct costs of the lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2025-01-01
-Paragraph 94
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 122
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_b&doctype=Standard
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-Paragraph 122
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_b&doctype=Standard
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- Definition

The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph 94
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_94&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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