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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning ₩ (220,230) ₩ 4,367  
Statements of profit or loss (169,961) (229,545) ₩ (72,124)
Other comprehensive income 1,631 4,948  
Ending (388,560) (220,230) 4,367
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 (240,633) (181,564)  
Statements of profit or loss (18,299) (68,166)  
Other comprehensive income 3,748 9,097  
Ending (255,184) (240,633) (181,564)
Deferred tax liabilities depreciation and impairment loss [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (88,588) (4,175)  
Statements of profit or loss (62,845) (84,413)  
Ending (151,433) (88,588) (4,175)
Deferred tax liabilities plan assets [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (538,928) (521,257)  
Statements of profit or loss (5,294) (17,340)  
Other comprehensive income 1,322 (331)  
Ending (542,900) (538,928) (521,257)
Deferred tax liabilities advanced depreciation provision [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (339,005) (311,918)  
Statements of profit or loss (182,934) (27,087)  
Ending (521,939) (339,005) (311,918)
Deferred tax liabilities contract assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (493,917) (509,509)  
Statements of profit or loss 69,615 15,592  
Ending (424,302) (493,917) (509,509)
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 (336) (627)  
Statements of profit or loss (73) 291  
Other comprehensive income (11)    
Ending (420) (336) (627)
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 (47,521) (30,623)  
Statements of profit or loss (71,396) (33,267)  
Other comprehensive income 58,288 16,369  
Ending (60,629) (47,521) (30,623)
Other deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (623,744) (472,153)  
Statements of profit or loss (111,135) (150,013)  
Other comprehensive income (3,274) (1,578)  
Ending (738,153) (623,744) (472,153)
Deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (2,372,672) (2,031,826)  
Statements of profit or loss (382,361) (364,403)  
Other comprehensive income 60,073 23,557  
Ending (2,694,960) (2,372,672) (2,031,826)
Deferred tax assets depreciation and impairment loss [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 225,821 226,960  
Statements of profit or loss (36,989) (1,139)  
Ending 188,832 225,821 226,960
Deferred tax assets contract liabilities [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 148,454 140,494  
Statements of profit or loss (27,165) 7,960  
Ending 121,289 148,454 140,494
Deferred tax assets defined benefit liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 571,336 598,364  
Statements of profit or loss (22,423) (8,663)  
Other comprehensive income (67,055) (18,365)  
Ending 481,858 571,336 598,364
Deferred tax assets provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 172,871 167,384  
Statements of profit or loss (20,894) 5,487  
Other comprehensive income (22)    
Ending 151,955 172,871 167,384
Other deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 899,543 758,060  
Statements of profit or loss 351,317 141,727  
Other comprehensive income 8,635 (244)  
Ending 1,259,495 899,543 758,060
Temporary differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning (354,647) (140,564)  
Statements of profit or loss (138,515) (219,031)  
Other comprehensive income 1,631 4,948  
Ending (491,531) (354,647) (140,564)
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 2,018,025 1,891,262  
Statements of profit or loss 243,846 145,372  
Other comprehensive income (58,442) (18,609)  
Ending 2,203,429 2,018,025 1,891,262
Deferred tax assets tax credit carry forwards [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Beginning 134,417 144,931  
Statements of profit or loss (31,446) (10,514)  
Ending ₩ 102,971 ₩ 134,417 ₩ 144,931