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Borrowings - Long-term Borrowings, Excluding Current Portion (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of detailed information about borrowings [line items] |  |
Long-term borrowings, excluding current portion | ₩ 16,374,578 | ₩ 14,881,620
Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current portion of non-current bonds issued | ₩ 16,374,578 | 14,881,620
Export-Import Bank of Korea and others [member] | Long-term borrowings [member] | Bottom of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | September 2001 |
Maturity date | January 2027~ December |
Interest rate (%) | 1.05% |
Export-Import Bank of Korea and others [member] | Long-term borrowings [member] | Top of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | December 2025 |
Maturity date | 2040 |
Interest rate (%) | 8.25% |
KB Securities co.,Ltd. and others [Member] | Long-term borrowings [member] | Bottom of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | July 2019 |
Maturity date | January 2027 |
Interest rate (%) | 1.77% |
KB Securities co.,Ltd. and others [Member] | Long-term borrowings [member] | Top of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | October 2025 |
Maturity date | May 2035 |
Interest rate (%) | 8.40% |
Gross amount [member] | Export-Import Bank of Korea and others [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term borrowings, excluding current portion | ₩ 6,605,336 | 4,868,703
Gross amount [member] | KB Securities co.,Ltd. and others [Member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term borrowings, excluding current portion | 9,859,696 | 10,108,600
Present value discount [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term borrowings, excluding current portion | (49,101) | (51,173)
Discount on debentures [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term borrowings, excluding current portion | ₩ (41,353) | ₩ (44,510)

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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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