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Segment Information - Summary of Operating Revenues and Non Current Assets by Geographical Regions (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [Line Items]      
Operating revenues ₩ 26,234,206 ₩ 25,205,659 ₩ 24,440,647
Non-current assets 21,115,704 20,881,181  
Domestic [member]      
Disclosure of geographical areas [Line Items]      
Operating revenues 26,074,349 25,114,719 24,368,729
Non-current assets 20,845,214 20,627,543  
Overseas [member]      
Disclosure of geographical areas [Line Items]      
Operating revenues 159,857 90,940 ₩ 71,918
Non-current assets ₩ 270,490 ₩ 253,638