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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,933,358 ₩ 1,720,654
Acquisition 210,808 87,398
Disposal and termination (17,490) (20,600)
Depreciation (52,869) (47,004)
Transfer from (to) property and equipment 126,250 206,183
Transfer and others (1,922) (13,273)
Ending balance 2,198,135 1,933,358
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 2,596,204 2,306,198
Ending balance 2,922,705 2,596,204
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (662,846) (585,544)
Ending balance (724,570) (662,846)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 879,792 813,763
Acquisition 0 14,569
Disposal and termination (8,167) (14,725)
Transfer from (to) property and equipment 37,725 63,278
Transfer and others 1 2,907
Ending balance 909,351 879,792
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 881,360 815,331
Ending balance 910,919 881,360
Land [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (1,568) (1,568)
Ending balance (1,568) (1,568)
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 916,458 840,090
Acquisition 57,529 17,351
Disposal and termination (9,323) (5,858)
Depreciation (52,869) (47,004)
Transfer from (to) property and equipment 88,336 140,229
Transfer and others 27,544 (28,350)
Ending balance 1,027,675 916,458
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,577,736 1,424,066
Ending balance 1,750,677 1,577,736
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (661,278) (583,976)
Ending balance (723,002) (661,278)
Investment property, construction-in-progress [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 137,108 66,801
Acquisition 153,279 55,478
Disposal and termination 0 (17)
Transfer from (to) property and equipment 189 2,676
Transfer and others (29,467) 12,170
Ending balance 261,109 137,108
Investment property, construction-in-progress [Member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 137,108 66,801
Ending balance ₩ 261,109 ₩ 137,108