Income Tax Expense - Details of the Changes in Deferred Tax Assets (Liabilities) (Detail) - KRW (₩)
₩ in Millions |
12 Months Ended |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
₩ (851,200)
|
₩ (820,627)
|
|
| Deferred tax expense (income) |
(63,796)
|
(4,749)
|
|
| Directly charged to (credited from) equity |
(443,279)
|
(11,005)
|
₩ 16,175
|
| Reclassified as liabilities held for sale |
(4,916)
|
151
|
|
| Changes in consolidation scope |
|
(14,970)
|
|
| Ending |
(1,363,191)
|
(851,200)
|
(820,627)
|
| Loss allowance [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
76,590
|
75,115
|
|
| Deferred tax expense (income) |
(3,648)
|
1,475
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
(11)
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
72,931
|
76,590
|
75,115
|
| Accrued interest income [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(968)
|
(6,839)
|
|
| Deferred tax expense (income) |
479
|
(1,395)
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
7,266
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
(489)
|
(968)
|
(6,839)
|
| Financial assets measured at fair value [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(39,533)
|
(2,526)
|
|
| Deferred tax expense (income) |
60,448
|
(32,508)
|
|
| Directly charged to (credited from) equity |
(502,149)
|
(4,499)
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
(481,234)
|
(39,533)
|
(2,526)
|
| Investments in subsidiaries, associates and joint ventures [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
69,749
|
22,930
|
|
| Deferred tax expense (income) |
(42,234)
|
62,447
|
|
| Directly charged to (credited from) equity |
(3,813)
|
(15,628)
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
23,702
|
69,749
|
22,930
|
| Property and equipment and intangible assets [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(423,592)
|
(419,413)
|
|
| Deferred tax expense (income) |
43,417
|
(3,861)
|
|
| Directly charged to (credited from) equity |
66,310
|
0
|
|
| Reclassified as liabilities held for sale |
(6)
|
(318)
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
(313,871)
|
(423,592)
|
(419,413)
|
| Provisions [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
1,331
|
1,319
|
|
| Deferred tax expense (income) |
(190)
|
12
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
(57)
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
1,084
|
1,331
|
1,319
|
| Retirement benefit obligation [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
38,034
|
12,430
|
|
| Deferred tax expense (income) |
(30,206)
|
18,338
|
|
| Directly charged to (credited from) equity |
4,301
|
7,266
|
|
| Reclassified as liabilities held for sale |
(53)
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
12,076
|
38,034
|
12,430
|
| Valuation gain on derivatives [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
14,478
|
19,670
|
|
| Deferred tax expense (income) |
(5,439)
|
(7,094)
|
|
| Directly charged to (credited from) equity |
(7,614)
|
1,902
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
1,425
|
14,478
|
19,670
|
| Foreign currency translation differences for foreign operations [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
20,370
|
20,667
|
|
| Deferred tax expense (income) |
1,206
|
(297)
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
21,576
|
20,370
|
20,667
|
| Incremental costs to acquire contract [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(722,952)
|
(718,211)
|
|
| Deferred tax expense (income) |
(125,979)
|
(4,741)
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
(848,931)
|
(722,952)
|
(718,211)
|
| Contract assets and liabilities [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
19,959
|
17,565
|
|
| Deferred tax expense (income) |
29,481
|
2,394
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
49,440
|
19,959
|
17,565
|
| Right-of-use assets [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(370,771)
|
(389,863)
|
|
| Deferred tax expense (income) |
49,035
|
19,092
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
(321,736)
|
(370,771)
|
(389,863)
|
| Lease liabilities [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
394,206
|
388,091
|
|
| Deferred tax expense (income) |
(8,912)
|
6,115
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
0
|
|
| Changes in consolidation scope |
|
0
|
|
| Ending |
385,294
|
394,206
|
388,091
|
| Others [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(50,634)
|
4,266
|
|
| Deferred tax expense (income) |
(22,647)
|
(47,646)
|
|
| Directly charged to (credited from) equity |
(314)
|
(46)
|
|
| Reclassified as liabilities held for sale |
(4,789)
|
(7,486)
|
|
| Changes in consolidation scope |
|
278
|
|
| Ending |
(78,384)
|
(50,634)
|
4,266
|
| Temporary differences [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
(973,733)
|
(974,799)
|
|
| Deferred tax expense (income) |
(55,189)
|
12,331
|
|
| Directly charged to (credited from) equity |
(443,279)
|
(11,005)
|
|
| Reclassified as liabilities held for sale |
(4,916)
|
(538)
|
|
| Changes in consolidation scope |
|
278
|
|
| Ending |
(1,477,117)
|
(973,733)
|
(974,799)
|
| Deferred tax assets related to unused tax loss carryforwards and tax credit carryforwards [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
122,533
|
154,172
|
|
| Deferred tax expense (income) |
(8,607)
|
(17,080)
|
|
| Directly charged to (credited from) equity |
0
|
0
|
|
| Reclassified as liabilities held for sale |
0
|
689
|
|
| Changes in consolidation scope |
|
(15,248)
|
|
| Ending |
113,926
|
122,533
|
154,172
|
| Tax loss carryforwards [Member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
0
|
7,150
|
|
| Deferred tax expense (income) |
|
2,812
|
|
| Directly charged to (credited from) equity |
|
0
|
|
| Reclassified as liabilities held for sale |
|
689
|
|
| Changes in consolidation scope |
|
(10,651)
|
|
| Ending |
|
0
|
7,150
|
| Unused tax credits [member] |
|
|
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |
|
|
|
| Beginning |
₩ 122,533
|
147,022
|
|
| Deferred tax expense (income) |
|
(19,892)
|
|
| Directly charged to (credited from) equity |
|
0
|
|
| Reclassified as liabilities held for sale |
|
0
|
|
| Changes in consolidation scope |
|
(4,597)
|
|
| Ending |
|
₩ 122,533
|
₩ 147,022
|