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Segment, Geographic and Other Information - Summary of Geographical Areas (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue      
Total revenue from external customers (Notes 2,4, 35, 45, 47) ₩ 70,546,024 ₩ 60,012,375 ₩ 57,926,634
Non-current assets [1] 188,431,533 182,333,348 176,505,403
Domestic      
Revenue      
Total revenue from external customers (Notes 2,4, 35, 45, 47) 69,142,730 58,771,252 56,775,375
Non-current assets [1] 183,707,117 178,760,564 173,673,478
Overseas      
Revenue      
Total revenue from external customers (Notes 2,4, 35, 45, 47) [2] 1,403,294 1,241,123 1,151,259
Non-current assets [1],[2] ₩ 4,724,416 ₩ 3,572,784 ₩ 2,831,925
[1] The amounts exclude financial assets and deferred tax assets.
[2] Middle East and other Asian countries make up the majority of overseas revenue and
non-current
assets. Since the overseas revenue or
non-current
assets attributable to particular countries are not material, they are not disclosed individually.