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Sales (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue [Abstract] |
Sales |
Details | of sales for the years ended December 31, 2016, 2017 and 2018 are as follows:
|  |  |  |  | 2016 |  |  | 2017 |  |  | 2018 |
|  |  |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |  |  | Domestic |  |  | Overseas |
|  |  |  |  | In millions of won |
[Type of goods and services] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of goods |  | ￦ |  |  |  |  | 54,982,095 |  |  |  | 397,392 |  |  |  | 55,373,316 |  |  |  | 399,232 |  |  |  | 57,514,866 |  |  |  | 382,938 |
Electricity |  |  |  |  |  |  | 54,304,529 |  |  |  | — |  |  |  | 54,649,882 |  |  |  | — |  |  |  | 56,842,011 |  |  |  | — |
Heat supply |  |  |  |  |  |  | 181,597 |  |  |  | — |  |  |  | 205,838 |  |  |  | — |  |  |  | 216,117 |  |  |  | — |
Others |  |  |  |  |  |  | 495,969 |  |  |  | 397,392 |  |  |  | 517,596 |  |  |  | 399,232 |  |  |  | 456,738 |  |  |  | 382,938 |
Sales of service |  |  |  |  |  |  | 195,697 |  |  |  | 161,046 |  |  |  | 186,990 |  |  |  | 164,167 |  |  |  | 176,539 |  |  |  | 216,328 |
Sales of construction services |  |  |  |  |  |  | 132,219 |  |  |  | 3,894,638 |  |  |  | 92,501 |  |  |  | 3,119,683 |  |  |  | 108,586 |  |  |  | 1,633,805 |
|  | ￦ |  |  |  |  | 55,310,011 |  |  |  | 4,453,076 |  |  |  | 55,652,807 |  |  |  | 3,683,082 |  |  |  | 57,799,991 |  |  |  | 2,233,071 |
[Timing of revenue recognition] |
Performance obligations satisfied at a point in time |  | ￦ |  |  |  |  | 54,982,095 |  |  |  | 397,392 |  |  |  | 55,373,316 |  |  |  | 399,232 |  |  |  | 57,514,866 |  |  |  | 382,938 |
Performance obligations satisfied over time |  |  |  |  |  |  | 327,916 |  |  |  | 4,055,684 |  |  |  | 279,491 |  |  |  | 3,283,850 |  |  |  | 285,125 |  |  |  | 1,850,133 |
|  | ￦ |  |  |  |  | 55,310,011 |  |  |  | 4,453,076 |  |  |  | 55,652,807 |  |  |  | 3,683,082 |  |  |  | 57,799,991 |  |  |  | 2,233,071 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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