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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,091,084 ₩ 1,189,531
Changes in accounting policy 46,666  
Acquisition 254,066 75,263
Disposal and termination (1,693) (14,967)
Depreciation (65,178) (44,653)
Transfer from (to) property and equipment 41,335 (39,363)
Transfer and others 21,150 (74,727)
Ending balance 1,387,430 1,091,084
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,518,917 1,590,018
Ending balance 1,880,584 1,518,917
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (427,833) (400,487)
Ending balance (493,154) (427,833)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 348,848 356,790
Acquisition 148,511 1,111
Disposal and termination (285) (4,729)
Transfer from (to) property and equipment 33,254 3,080
Transfer and others 23,268 (7,404)
Ending balance 553,596 348,848
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 350,417 358,358
Ending balance 555,164 350,417
Land [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (1,569) (1,568)
Ending balance (1,568) (1,569)
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 742,115 792,768
Changes in accounting policy 46,666  
Acquisition 103,774 7
Disposal and termination (1,408) (10,238)
Depreciation (65,178) (44,653)
Transfer from (to) property and equipment 8,081 (5,366)
Transfer and others (2,118) 9,597
Ending balance 831,932 742,115
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,168,379 1,191,687
Ending balance 1,323,518 1,168,379
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (426,264) (398,919)
Ending balance (491,586) (426,264)
Investment property, construction-in-progress [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 121 39,973
Acquisition 1,781 74,145
Transfer from (to) property and equipment   (37,077)
Transfer and others   (76,920)
Ending balance 1,902 121
Investment property, construction-in-progress [Member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 121 39,973
Ending balance 1,902 121
Investment property, construction-in-progress [Member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 0  
Ending balance   ₩ 0