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v3.26.1

Income Taxes - Movements in Deferred Tax Assets (Liabilities) (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | ₩ 927,795 | ₩ 595,363
Inc. (Dec.) | (54,613) | 332,432
Ending | 873,182 | 927,795
Allowance for doubtful accounts [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 187,472 | 156,608
Inc. (Dec.) | 88,053 | 30,864
Ending | 275,525 | 187,472
PP&E and Intangible asset [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 286,927 | 239,702
Inc. (Dec.) | (859,828) | 47,225
Ending | (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] |  |
Beginning | 284,954 | 290,919
Inc. (Dec.) | 27,420 | (5,965)
Ending | 312,374 | 284,954
Allowance for inventories valuation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 34,849 | 63,187
Inc. (Dec.) | (18,580) | (28,338)
Ending | 16,269 | 34,849
Prepaid expenses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 14,942 | 13,553
Inc. (Dec.) | (869) | 1,389
Ending | 14,073 | 14,942
Gain or loss on foreign currency translation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 217,580 | 143,239
Inc. (Dec.) | (94,052) | 74,341
Ending | 123,528 | 217,580
Defined benefit liabilities [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 9,130 | (3,534)
Inc. (Dec.) | 26,705 | 12,664
Ending | 35,835 | 9,130
Provision for construction losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 12,337 | 11,669
Inc. (Dec.) | 15,340 | 668
Ending | 27,677 | 12,337
Provision for construction warranty [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 43,241 | 45,723
Inc. (Dec.) | 2,428 | (2,482)
Ending | 45,669 | 43,241
Accrued income [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | (14,559) | (21,271)
Inc. (Dec.) | (25,991) | 6,712
Ending | (40,550) | (14,559)
Provision for accelerated depreciation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | (2,627,287) | (2,660,730)
Inc. (Dec.) |  | 33,443
Ending |  | (2,627,287)
Provision for accelerated depreciation, net [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | (1,091,668) |
Inc. (Dec.) | 646,835 |
Ending | (444,833) | (1,091,668)
Spin-off [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 1,535,619 | 1,536,177
Inc. (Dec.) |  | (558)
Ending |  | 1,535,619
Impairment loss on AFS [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 64,811 | 94,317
Inc. (Dec.) | 7,576 | (29,506)
Ending | 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] |  |
Beginning | 34,228 | 43,741
Inc. (Dec.) | (13,736) | (9,513)
Ending | 20,492 | 34,228
Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 118,616 | 159,102
Inc. (Dec.) | 165,854 | (40,486)
Ending | 284,470 | 118,616
Deferred income tax due to temporary differences [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 202,860 | 112,402
Inc. (Dec.) | (32,845) | 90,458
Ending | 170,015 | 202,860
Net changes in fair value of equity investments at fair value through other comprehensive income [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 11,881 | (35,572)
Inc. (Dec.) | (129,758) | 47,453
Ending | (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] |  |
Beginning | 60,398 | 47,288
Inc. (Dec.) | 21,866 | 13,110
Ending | 82,264 | 60,398
Deferred income taxes recognized directly to equity [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 72,279 | 11,716
Inc. (Dec.) | (107,892) | 60,563
Ending | (35,613) | 72,279
Tax credit carry-forward and others [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning | 384,376 | 253,559
Inc. (Dec.) | 148,700 | 130,817
Ending | 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] |  |
Beginning | 268,280 | 217,686
Inc. (Dec.) | (62,576) | 50,594
Ending | ₩ 205,704 | ₩ 268,280

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