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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