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Taxes (Details 5) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
General Taxes |  |  |
KWH excise | $ 188 | $ 196 | $ 193
State gross receipts | 204 | 212 | 224
Real and personal property | 486 | 472 | 410
Social security and unemployment | 131 | 127 | 119
Other | 34 | 35 | 32
Total general taxes | 1,043 | 1,042 | 978
FES |  |  |
General Taxes |  |  |
State gross receipts | 20 | 28 | 44
Real and personal property | 27 | 42 | 36
Social security and unemployment | 11 | 15 | 16
Other | 0 | 3 | 2
Total general taxes | $ 58 | $ 88 | $ 98

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