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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,387,430 ₩ 1,091,084
Changes in accounting policy   46,666
Acquisition 53,062 254,066
Disposal and termination (1,779) (1,693)
Depreciation (64,531) (65,178)
Transfer from (to) property and equipment 2,056 41,335
Transfer and others (7,785) 21,150
Ending balance 1,368,453 1,387,430
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,880,584 1,518,917
Ending balance 1,927,776 1,880,584
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (493,154) (427,833)
Ending balance (559,323) (493,154)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 553,596 348,848
Acquisition 11,723 148,511
Disposal and termination (1,536) (285)
Transfer from (to) property and equipment (6,792) 33,254
Transfer and others (18,656) 23,268
Ending balance 538,335 553,596
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 555,164 350,417
Ending balance 539,903 555,164
Land [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (1,568) (1,569)
Ending balance (1,568) (1,568)
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 831,932 742,115
Changes in accounting policy   46,666
Acquisition 7,096 103,774
Disposal and termination (243) (1,408)
Depreciation (64,531) (65,178)
Transfer from (to) property and equipment 8,848 8,081
Transfer and others 469 (2,118)
Ending balance 783,571 831,932
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,323,518 1,168,379
Ending balance 1,341,326 1,323,518
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (491,586) (426,264)
Ending balance (557,755) (491,586)
Investment property, construction-in-progress [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,902 121
Acquisition 34,243 1,781
Transfer and others 10,402  
Ending balance 46,547 1,902
Investment property, construction-in-progress [Member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,902 121
Ending balance ₩ 46,547 ₩ 1,902