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Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Segment Information [Abstract]  
Summary Of Company's Reporting Segments
2012 2011 2010
  Electric All Other Total Electric All Other Total Electric All Other Total

Operating revenues

$1,230  -   $1,230 $1,172  -   $1,172 $1,145  -   $1,145
Depreciation and amortization 177  -   177 167  -   167 164  -   164
Income taxes 68 (20) 48 66 (29) 37 76 (25) 51
Net income 104 (32) 72 105 (44) 61 120 (40) 80
Utility plant - net of depreciation 2,426  -   2,426 2,441  -   2,441 2,362  -   2,362
Capital expenditures 130  -   130 210  -   210 164  -   164