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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,189,531 ₩ 1,148,044
Acquisition 75,263 48,850
Disposal and termination (14,967) (9,927)
Depreciation (44,653) (47,295)
Transfer from(to) property and equipment (39,363) 61,472
Transfer and others (74,727) (11,613)
Ending balance 1,091,084 1,189,531
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,590,018 1,501,400
Ending balance 1,518,917 1,590,018
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (400,487) (353,356)
Ending balance (427,833) (400,487)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 356,790 302,750
Acquisition 1,111  
Disposal and termination (4,729) (3,493)
Transfer from(to) property and equipment 3,080 64,449
Transfer and others (7,404) (6,916)
Ending balance 348,848 356,790
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 358,358 302,750
Ending balance 350,417 358,358
Land [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (1,568)  
Ending balance (1,569) (1,568)
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 792,768 766,529
Acquisition 7 775
Disposal and termination (10,238) (6,434)
Depreciation (44,653) (47,295)
Transfer from(to) property and equipment (5,366) (1,793)
Transfer and others 9,597 80,986
Ending balance 742,115 792,768
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,191,687 1,119,885
Ending balance 1,168,379 1,191,687
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (398,919) (353,356)
Ending balance (426,264) (398,919)
Investment property, construction-in-progress [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 39,973 78,765
Acquisition 74,145 48,075
Transfer from(to) property and equipment (37,077) (1,184)
Transfer and others (76,920) (85,683)
Ending balance 121 39,973
Investment property, construction-in-progress [Member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 39,973 78,765
Ending balance ₩ 121 ₩ 39,973