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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,720,654 ₩ 1,368,453
Acquisition 87,398 270,374
Disposal and termination (20,600) (21,995)
Depreciation (47,004) (47,754)
Transfer from (to) property and equipment 206,183 132,944
Changes in scope of consolidation   7,041
Transfer and others (13,273) 11,591
Ending balance 1,933,358 1,720,654
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 2,306,198 1,927,776
Ending balance 2,596,204 2,306,198
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (585,544) (559,323)
Ending balance (662,846) (585,544)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 813,763 538,335
Acquisition 14,569 171,872
Disposal and termination (14,725) (17,133)
Transfer from (to) property and equipment 63,278 59,848
Changes in scope of consolidation   5,262
Transfer and others 2,907 55,579
Ending balance 879,792 813,763
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 815,331 539,903
Ending balance 881,360 815,331
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 840,090 783,571
Acquisition 17,351 42,151
Disposal and termination (5,858) (4,862)
Depreciation (47,004) (47,754)
Transfer from (to) property and equipment 140,229 73,096
Changes in scope of consolidation   1,779
Transfer and others (28,350) (7,891)
Ending balance 916,458 840,090
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,424,066 1,341,326
Ending balance 1,577,736 1,424,066
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (583,976) (557,755)
Ending balance (661,278) (583,976)
Investment property, construction-in-progress [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 66,801 46,547
Acquisition 55,478 56,351
Disposal and termination (17)  
Transfer from (to) property and equipment 2,676  
Transfer and others 12,170 (36,097)
Ending balance 137,108 66,801
Investment property, construction-in-progress [Member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 66,801 46,547
Ending balance ₩ 137,108 ₩ 66,801