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Taxes (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
General Taxes      
KWH excise $ 196 $ 193 $ 194
State gross receipts 212 224 226
Real and personal property 472 410 393
Social security and unemployment 127 119 112
Other 35 32 37
Total general taxes 1,042 978 962
FES      
General Taxes      
State gross receipts 28 44 69
Real and personal property 42 36 39
Social security and unemployment 15 16 17
Other 3 2 3
Total general taxes $ 88 $ 98 $ 128