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Income Taxes - Summary of Deferred Tax Assets And Liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | ₩ 873,182 | ₩ 927,795 | ₩ 595,363
Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 2,507,555 | 3,649,163 |
Liabilities | (2,337,540) | (3,446,303) |
Net | 170,015 | 202,860 |
Deferred Income Tax Due to Temporary Difference [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 136,705 | 127,388 |
Liabilities | (172,318) | (55,109) |
Net | (35,613) | 72,279 |
Deferred Tax From Tax Credit [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 3,705,215 | 4,705,409 |
Liabilities | (2,832,033) | (3,777,614) |
Net | 873,182 | 927,795 |
Allowance for credit losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 275,525 | 187,472 | 156,608
Allowance for credit losses [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 275,547 | 187,522 |
Liabilities | (22) | (50) |
Net | 275,525 | 187,472 |
PP&E and Intangible asset [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (572,901) | 286,927 | 239,702
PP&E and Intangible asset [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 569,256 | 381,583 |
Liabilities | (1,142,157) | (94,656) |
Net | (572,901) | 286,927 |
Share of profit or loss of equity - accounted investees [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 312,374 | 284,954 | 290,919
Share of profit or loss of equity - accounted investees [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 325,925 | 297,596 |
Liabilities | (13,551) | (12,642) |
Net | 312,374 | 284,954 |
Allowance for inventories valuation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 16,269 | 34,849 | 63,187
Allowance for inventories valuation [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 16,269 | 34,849 |
Net | 16,269 | 34,849 |
Prepaid expenses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 14,073 | 14,942 | 13,553
Prepaid expenses [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 14,313 | 16,366 |
Liabilities | (240) | (1,424) |
Net | 14,073 | 14,942 |
Gain or loss on foreign currency [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 123,528 | 217,580 | 143,239
Gain or loss on foreign currency [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 142,708 | 222,220 |
Liabilities | (19,180) | (4,640) |
Net | 123,528 | 217,580 |
Defined benefit liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 35,835 | 9,130 | (3,534)
Defined benefit liabilities [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 614,728 | 612,680 |
Liabilities | (578,893) | (603,550) |
Net | 35,835 | 9,130 |
Provision for construction losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 27,677 | 12,337 | 11,669
Provision for construction losses [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 27,677 | 12,337 |
Net | 27,677 | 12,337 |
Provision for construction warranty [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 45,669 | 43,241 | 45,723
Provision for construction warranty [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 45,669 | 43,241 |
Net | 45,669 | 43,241 |
Accrued income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (40,550) | (14,559) | (21,271)
Accrued income [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Liabilities | (40,550) | (14,559) |
Net | (40,550) | (14,559) |
Provision for accelerated depreciation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net |  | (2,627,287) | (2,660,730)
Provision for accelerated depreciation [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Liabilities | (444,833) | (2,627,287) |
Net | (444,833) | (2,627,287) |
Spin-off [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net |  | 1,535,619 | 1,536,177
Spin-off [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 0 | 1,538,619 |
Liabilities | 0 | (3,000) |
Net | 0 | 1,535,619 |
Impairment loss on AFS [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 72,387 | 64,811 | 94,317
Impairment loss on AFS [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 72,387 | 64,811 |
Net | 72,387 | 64,811 |
Difference in acquisition costs of treasury shares [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 20,492 | 34,228 | 43,741
Difference in acquisition costs of treasury shares [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 20,492 | 34,228 |
Net | 20,492 | 34,228 |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 284,470 | 118,616 | 159,102
Other [member] | Deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 382,584 | 203,111 |
Liabilities | (98,114) | (84,495) |
Net | 284,470 | 118,616 |
Changes in fair value of investments in equity instruments measured at fair value through other comprehensive income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (117,877) | 11,881 | (35,572)
Changes in fair value of investments in equity instruments measured at fair value through other comprehensive income [member] | Deferred Income Tax Due to Temporary Difference [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 48,881 | 59,666 |
Liabilities | (166,758) | (47,785) |
Net | (117,877) | 11,881 |
Other deferred income taxes recognized directly to equity [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 82,264 | 60,398 | 47,288
Other deferred income taxes recognized directly to equity [member] | Deferred Income Tax Due to Temporary Difference [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 87,824 | 67,722 |
Liabilities | (5,560) | (7,324) |
Net | 82,264 | 60,398 |
Tax credit carry-forward and others [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 533,076 | 384,376 | 253,559
Tax credit carry-forward and others [member] | Deferred Tax From Tax Credit [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 533,076 | 384,376 |
Net | 533,076 | 384,376 |
Investments in subsidiaries, associates and joint ventures [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 205,704 | 268,280 | ₩ 217,686
Investments in subsidiaries, associates and joint ventures [member] | Deferred Tax From Tax Credit [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Assets | 527,879 | 544,482 |
Liabilities | (322,175) | (276,202) |
Net | ₩ 205,704 | ₩ 268,280 |

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