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Geographical areas (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue |  |  |  |
Electricity |  | ₩ 56,842,011 | ₩ 54,649,882 | ₩ 54,304,529
Heat supply |  | 216,117 | 205,838 | 181,597
Others |  | 839,676 | 916,828 | 893,361
Sales of goods |  | 57,897,804 | 55,772,548 | 55,379,487
Sales of services |  | 392,867 | 351,157 | 356,743
Sales of construction services |  | 1,742,391 | 3,212,184 | 4,026,857
Total revenue from external customers |  | 60,033,062 | 59,335,889 | 59,763,087
Non-current assets | [1] | 160,336,774 | 157,934,345 | 152,772,376
Domestic |  |  |  |
Revenue |  |  |  |
Electricity |  | 56,842,011 | 54,649,882 | 54,304,529
Heat supply |  | 216,117 | 205,838 | 181,597
Others |  | 456,738 | 517,596 | 495,969
Sales of goods |  | 57,514,866 | 55,373,316 | 54,982,095
Sales of services |  | 176,539 | 186,990 | 195,697
Sales of construction services |  | 108,586 | 92,501 | 132,219
Total revenue from external customers |  | 57,799,991 | 55,652,807 | 55,310,011
Non-current assets | [1] | 157,037,428 | 153,436,810 | 148,297,677
Overseas |  |  |  |
Revenue |  |  |  |
Electricity |  | 0 | 0 | 0
Heat supply |  | 0 | 0 | 0
Others |  | 382,938 | 399,232 | 397,392
Sales of goods |  | 382,938 | 399,232 | 397,392
Sales of services |  | 216,328 | 164,167 | 161,046
Sales of construction services |  | 1,633,805 | 3,119,683 | 3,894,638
Total revenue from external customers | [2] | 2,233,071 | 3,683,082 | 4,453,076
Non-current assets | [1],[2] | ₩ 3,299,346 | ₩ 4,497,535 | ₩ 4,474,699
[1] | Amount excludes 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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