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Borrowings - Summary of Repayment of Debentures and Borrowings Including the Current Liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | ₩ 10,218,165 | ₩ 10,006,685
Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,356,251 | ₩ 1,083,705
Gross carrying amount [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 10,236,958 |
Gross carrying amount [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 8,454,921 |
Gross carrying amount [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 5,808,000 |
Gross carrying amount [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,646,921 |
Gross carrying amount [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,782,037 |
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,616,088 |
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 165,949 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3,058,526 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,932,941 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,478,000 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 454,941 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,125,585 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,016,254 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 109,331 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3,083,400 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,605,460 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,445,000 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,160,460 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 477,940 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 421,322 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 56,618 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,384,847 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,275,760 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 760,000 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 515,760 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 109,087 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 109,087 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 682,420 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 666,820 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 280,000 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 386,820 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 15,600 |
Gross carrying amount [member] | Jan 1, 2026 - Dec 31, 2026 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 15,600 |
Gross carrying amount [member] | After 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,027,765 |
Gross carrying amount [member] | After 2027 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,973,940 |
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,845,000 |
Gross carrying amount [member] | After 2027 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 128,940 |
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 53,825 |
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 53,825 |
Gross carrying amount [member] | After 2027 [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | ₩ 0 |

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