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Segment, Geographic and Other Information - Summary of Geographical Areas (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]      
Revenue from external customers ₩ 92,578,265 ₩ 87,476,410 ₩ 70,546,024
Non-current assets [1] 195,972,142 191,206,960 188,431,533
Domestic      
Disclosure of geographical areas [line items]      
Revenue from external customers 91,286,837 86,242,808 69,142,730
Non-current assets [1] 191,214,679 186,384,115 183,707,117
Overseas      
Disclosure of geographical areas [line items]      
Revenue from external customers [2] 1,291,428 1,233,602 1,403,294
Non-current assets [1],[2] ₩ 4,757,463 ₩ 4,822,845 ₩ 4,724,416
[1] The amounts exclude financial assets, deferred tax assets, and net defined benefit 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.