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Segment, Geographic and Other Information - Summary of Geographical Areas (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | ₩ 59,913,607 | ₩ 57,925,837 | ₩ 58,568,082
Non-current assets | [1] | 182,318,491 | 176,505,403 | 172,110,120
Domestic |  |  |  |
Revenue |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 58,672,484 | 56,774,578 | 56,942,128
Non-current assets | [1] | 178,745,707 | 173,673,478 | 169,366,365
Overseas |  |  |  |
Revenue |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) | [2] | 1,241,123 | 1,151,259 | 1,625,954
Non-current assets | [1],[2] | ₩ 3,572,784 | ₩ 2,831,925 | ₩ 2,743,755
[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.

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