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Sales - Summary of Sales (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | ₩ 58,702,209 | ₩ 56,684,312 | ₩ 56,894,876
Sales related to rendering of services |  | 456,400 | 429,350 | 408,290
Sales of construction services |  | 754,998 | 812,175 | 1,264,916
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 59,913,607 | 57,925,837 | 58,568,082
Domestic |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 58,261,006 | 56,380,608 | 56,609,330
Sales related to rendering of services |  | 252,216 | 223,075 | 222,106
Sales of construction services |  | 159,262 | 170,895 | 110,692
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 58,672,484 | 56,774,578 | 56,942,128
Domestic | Electricity |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 57,210,231 | 55,730,985 | 55,939,001
Domestic | Heat Supply |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 232,294 | 198,715 | 220,948
Domestic | Others |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 818,481 | 450,908 | 449,381
Domestic | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 58,261,006 | 56,380,608 | 56,609,330
Domestic | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 411,478 | 393,970 | 332,798
Overseas |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 441,203 | 303,704 | 285,546
Sales related to rendering of services |  | 204,184 | 206,275 | 186,184
Sales of construction services |  | 595,736 | 641,280 | 1,154,224
Total revenue from external customers (Notes 4, 35, 45, 47) | [1] | 1,241,123 | 1,151,259 | 1,625,954
Overseas | Electricity |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 0 | 0 | 0
Overseas | Heat Supply |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 0 | 0 | 0
Overseas | Others |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Sales of goods |  | 441,203 | 303,704 | 285,546
Overseas | Performance obligations satisfied at point in time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | 441,203 | 303,704 | 285,546
Overseas | Performance obligations satisfied over time |  |  |  |
Disclosure of performance obligations [line items] |  |  |  |
Total revenue from external customers (Notes 4, 35, 45, 47) |  | ₩ 799,920 | ₩ 847,555 | ₩ 1,340,408
[1] | 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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