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Deferred Income Tax and Income Tax Expense - Summary of Movement in Deferred Income Tax Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | ₩ (388,560) | ₩ (220,230) |
Statements of profit or loss | 16,827 | (169,961) | ₩ (229,545)
Other comprehensive income | (8,097) | 1,631 |
Ending | (379,830) | (388,560) | (220,230)
Deferred tax liabilities investment in subsidiaries associates and joint ventures [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (255,184) | (240,633) |
Statements of profit or loss | (7,821) | (18,299) |
Other comprehensive income | (7,225) | 3,748 |
Ending | (270,230) | (255,184) | (240,633)
Deferred tax liabilities depreciation and impairment loss [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (151,433) | (88,588) |
Statements of profit or loss | 39,309 | (62,845) |
Ending | (112,124) | (151,433) | (88,588)
Deferred tax liabilities plan assets [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (542,900) | (538,928) |
Statements of profit or loss | 8,367 | (5,294) |
Other comprehensive income | 826 | 1,322 |
Ending | (533,707) | (542,900) | (538,928)
Deferred tax liabilities advanced depreciation provision [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (521,939) | (339,005) |
Statements of profit or loss | 3,859 | (182,934) |
Ending | (518,080) | (521,939) | (339,005)
Deferred tax liabilities contract assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (424,302) | (493,917) |
Statements of profit or loss | 2,478 | 69,615 |
Ending | (421,824) | (424,302) | (493,917)
Deferred tax liabilities financial assets at fair value through profit or loss [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (420) | (336) |
Statements of profit or loss | 461 | (73) |
Other comprehensive income | 43 | (11) |
Ending | 84 | (420) | (336)
Deferred tax liabilities Financial assets at fair value through other comprehensive income [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (60,629) | (47,521) |
Statements of profit or loss | (53) | (71,396) |
Other comprehensive income | (41,945) | 58,288 |
Ending | (102,627) | (60,629) | (47,521)
Other deferred tax liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (738,153) | (623,744) |
Statements of profit or loss | 90,876 | (111,135) |
Other comprehensive income | (2,378) | (3,274) |
Ending | (649,655) | (738,153) | (623,744)
Deferred tax liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (2,694,960) | (2,372,672) |
Statements of profit or loss | 137,476 | (382,361) |
Other comprehensive income | (50,679) | 60,073 |
Ending | (2,608,163) | (2,694,960) | (2,372,672)
Deferred tax assets depreciation and impairment loss [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 188,832 | 225,821 |
Statements of profit or loss | (71,689) | (36,989) |
Other comprehensive income | (397) |  |
Ending | 116,746 | 188,832 | 225,821
Deferred tax assets contract liabilities [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 121,289 | 148,454 |
Statements of profit or loss | (9,311) | (27,165) |
Ending | 111,978 | 121,289 | 148,454
Deferred tax assets defined benefit liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 481,858 | 571,336 |
Statements of profit or loss | (6,705) | (22,423) |
Other comprehensive income | 40,838 | (67,055) |
Ending | 515,991 | 481,858 | 571,336
Deferred tax assets provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 151,955 | 172,871 |
Statements of profit or loss | (5,784) | (20,894) |
Other comprehensive income | 0 | (22) |
Ending | 146,171 | 151,955 | 172,871
Other deferred tax assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 1,259,495 | 899,543 |
Statements of profit or loss | (53,459) | 351,317 |
Other comprehensive income | 2,141 | 8,635 |
Ending | 1,208,177 | 1,259,495 | 899,543
Deferred tax assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 2,203,429 | 2,018,025 |
Statements of profit or loss | (146,948) | 243,846 |
Other comprehensive income | 42,582 | (58,442) |
Ending | 2,099,063 | 2,203,429 | 2,018,025
Temporary differences [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | (491,531) | (354,647) |
Statements of profit or loss | (9,472) | (138,515) |
Other comprehensive income | (8,097) | 1,631 |
Ending | (509,100) | (491,531) | (354,647)
Deferred tax assets tax credit carry forwards [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Beginning | 102,971 | 134,417 |
Statements of profit or loss | 26,299 | (31,446) |
Ending | ₩ 129,270 | ₩ 102,971 | ₩ 134,417

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