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Borrowings - Short-term Borrowings and Current Portion of Long-term Borrowings (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of detailed information about borrowings [line items] |  |
Current borrowings and current portion of non-current borrowings | ₩ 12,117,422 | ₩ 11,115,747
Short-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Short-term borrowings | 7,431,957 | 5,733,091
Short-term borrowings [member] | JP Morgan and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Short-term borrowings | 137,852 | 85,892
Short-term borrowings [member] | HSBC and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Short-term borrowings | 7,294,105 | 5,647,199
Current portion of long-term liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current portion of debentures | 4,685,465 | 5,382,656
Current portion of long-term liabilities [member] | Foreign currency exchangable bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current portion of debentures | ₩ 44,509 | 39,053
Bottom of range [member] | Short-term borrowings [member] | JP Morgan and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | January 2025 |
Maturity date | January 2026 |
Interest rate (%) | 3.40% |
Bottom of range [member] | Short-term borrowings [member] | HSBC and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | January 2025 |
Maturity date | January 2026 |
Interest rate (%) | 0.75% |
Bottom of range [member] | Current portion of long-term liabilities [member] | Export-Import Bank of Korea and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | December 2006 |
Maturity date | January 2026 |
Interest rate (%) | 1.00% |
Bottom of range [member] | Current portion of long-term liabilities [member] | KB Securities co.,Ltd. and others [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | July 2019 |
Maturity date | January 2026 |
Interest rate (%) | 1.77% |
Top of range [member] | Short-term borrowings [member] | JP Morgan and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | December 2025 |
Maturity date | December 2026 |
Interest rate (%) | 6.20% |
Top of range [member] | Short-term borrowings [member] | HSBC and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | December 2025 |
Maturity date | December 2026 |
Interest rate (%) | 7.95% |
Top of range [member] | Current portion of long-term liabilities [member] | Export-Import Bank of Korea and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | December 2025 |
Maturity date | December 2026 |
Interest rate (%) | 8.50% |
Top of range [member] | Current portion of long-term liabilities [member] | KB Securities co.,Ltd. and others [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | September 2024 |
Maturity date | September 2026 |
Interest rate (%) | 5.63% |
Top of range [member] | Current portion of long-term liabilities [member] | Foreign currency exchangable bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Issuance date | September 2021 |
Maturity date | September 2026 |
Gross amount [member] | Current portion of long-term liabilities [member] | Export-Import Bank of Korea and others [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current portion of debentures | ₩ 1,302,568 | 1,323,002
Gross amount [member] | Current portion of long-term liabilities [member] | KB Securities co.,Ltd. and others [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current portion of debentures | 3,340,036 | 4,024,084
Discount on debentures [member] | Current portion of long-term liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current portion of debentures | ₩ (1,648) | ₩ (3,483)

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