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Borrowings - Summary of Repayment of Borrowings Including the Current Liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | ₩ 8,437,703 | ₩ 7,316,298
Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 552,995 | ₩ 272,263
Gross carrying amount [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 8,489,330 |
Gross carrying amount [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 7,585,920 |
Gross carrying amount [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 4,597,465 |
Gross carrying amount [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,988,455 |
Gross carrying amount [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 903,410 |
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 740,381 |
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 163,029 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,729,881 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,339,151 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 560,000 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 779,151 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 390,730 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 330,994 |
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 59,736 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,088,763 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,017,658 |
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 | 650,000 |
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 | 367,658 |
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 71,105 |
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 | 15,493 |
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 | 55,612 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,738,511 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,579,046 |
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 | 1,160,000 |
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 | 419,046 |
Gross carrying amount [member] | Jan 1, 2024 - Dec 31, 2024 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 159,465 |
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 | 135,494 |
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 | 23,971 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 976,493 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 832,200 |
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 | 358,000 |
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 | 474,200 |
Gross carrying amount [member] | Jan 1, 2025 - Dec 31, 2025 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 144,293 |
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 | 144,293 |
Gross carrying amount [member] | After 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,955,682 |
Gross carrying amount [member] | After 2026 [member] | Bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,817,865 |
Gross carrying amount [member] | After 2026 [member] | Bonds [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 1,869,465 |
Gross carrying amount [member] | After 2026 [member] | Bonds [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 948,400 |
Gross carrying amount [member] | After 2026 [member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 137,817 |
Gross carrying amount [member] | After 2026 [member] | Long-term borrowings [member] | In local currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 114,107 |
Gross carrying amount [member] | After 2026 [member] | Long-term borrowings [member] | In foreign currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | ₩ 23,710 |

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