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Leases - Additional Information (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract]    
Depreciation property plant and equipment ₩ 63,070  
Operating lease expenses incurred   ₩ 132,225
Cash outflow for leases 532,730  
Increase decrease in right of use assets 426,965  
Increase decrease in investment property ₩ 73,119