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Geographical areas (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue      
Electricity ₩ 55,939,001 ₩ 56,842,011 ₩ 54,649,882
Heat supply 220,948 216,117 205,838
Others 734,927 839,676 916,828
Sales of goods 56,894,876 57,897,804 55,772,548
Sales of services 408,290 392,867 351,157
Sales of construction services 1,264,916 1,742,391 3,212,184
Total revenue from external customers 58,568,082 60,033,062 59,335,889
Non-current assets [1] 172,110,120 160,336,774 157,934,345
Domestic      
Revenue      
Electricity 55,939,001 56,842,011 54,649,882
Heat supply 220,948 216,117 205,838
Others 449,381 456,738 517,596
Sales of goods 56,609,330 57,514,866 55,373,316
Sales of services 222,106 176,539 186,990
Sales of construction services 110,692 108,586 92,501
Total revenue from external customers 56,942,128 57,799,991 55,652,807
Non-current assets [1] 169,366,365 157,037,428 153,436,810
Overseas      
Revenue      
Electricity 0 0 0
Heat supply 0 0 0
Others 285,546 382,938 399,232
Sales of goods 285,546 382,938 399,232
Sales of services 186,184 216,328 164,167
Sales of construction services 1,154,224 1,633,805 3,119,683
Total revenue from external customers [2] 1,625,954 2,233,071 3,683,082
Non-current assets [1],[2] ₩ 2,743,755 ₩ 3,299,346 ₩ 4,497,535
[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.