XML 132 R117.htm IDEA: XBRL DOCUMENT v3.8.0.1
Geographical areas (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue [Abstract]      
Electricity ₩ 54,649,882 ₩ 54,304,529 ₩ 53,229,470
Heat supply 205,838 181,597 204,987
Others 916,828 893,361 932,579
Sales of goods 55,772,548 55,379,487 54,367,036
Sales of services 351,157 356,743 453,487
Sales of construction services 3,212,184 4,026,857 3,761,204
Total revenue from external customers 59,335,889 59,763,087 58,581,727
Non-current assets [1] 157,934,345 152,772,376 148,314,438
Domestic [Member]      
Revenue [Abstract]      
Electricity 54,649,882 54,304,529 53,229,470
Heat supply 205,838 181,597 204,987
Others 517,596 495,969 527,006
Sales of goods 55,373,316 54,982,095 53,961,463
Sales of services 186,990 195,697 209,189
Sales of construction services 92,501 132,219 180,424
Total revenue from external customers 55,652,807 55,310,011 54,351,076
Non-current assets [1] 153,436,810 148,297,677 143,788,043
Overseas [Member]      
Revenue [Abstract]      
Others 399,232 397,392 405,573
Sales of goods 399,232 397,392 405,573
Sales of services 164,167 161,046 244,298
Sales of construction services 3,119,683 3,894,638 3,580,780
Total revenue from external customers [2] 3,683,082 4,453,076 4,230,651
Non-current assets [1],[2] ₩ 4,497,535 ₩ 4,474,699 ₩ 4,526,395
[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.