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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.