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Geographical areas (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue |  |  |  |
Electricity |  | ₩ 55,730,985 | ₩ 55,939,001 | ₩ 56,842,011
Heat supply |  | 198,715 | 220,948 | 216,117
Others |  | 754,612 | 734,927 | 839,676
Sales of goods |  | 56,684,312 | 56,894,876 | 57,897,804
Sales of services |  | 429,350 | 408,290 | 392,867
Sales of construction services |  | 812,175 | 1,264,916 | 1,742,391
Total revenue from external customers |  | 57,925,837 | 58,568,082 | 60,033,062
Non-current assets | [1] | 176,505,403 | 172,110,120 | 160,336,774
Domestic |  |  |  |
Revenue |  |  |  |
Electricity |  | 55,730,985 | 55,939,001 | 56,842,011
Heat supply |  | 198,715 | 220,948 | 216,117
Others |  | 450,908 | 449,381 | 456,738
Sales of goods |  | 56,380,608 | 56,609,330 | 57,514,866
Sales of services |  | 223,075 | 222,106 | 176,539
Sales of construction services |  | 170,895 | 110,692 | 108,586
Total revenue from external customers |  | 56,774,578 | 56,942,128 | 57,799,991
Non-current assets | [1] | 173,673,478 | 169,366,365 | 157,037,428
Overseas |  |  |  |
Revenue |  |  |  |
Electricity |  | 0 | 0 | 0
Heat supply |  | 0 | 0 | 0
Others |  | 303,704 | 285,546 | 382,938
Sales of goods |  | 303,704 | 285,546 | 382,938
Sales of services |  | 206,275 | 186,184 | 216,328
Sales of construction services |  | 641,280 | 1,154,224 | 1,633,805
Total revenue from external customers | [2] | 1,151,259 | 1,625,954 | 2,233,071
Non-current assets | [1],[2] | ₩ 2,831,925 | ₩ 2,743,755 | ₩ 3,299,346
[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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