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Kingston Fossil Plant Ash Spill (Details) (USD $) | 3 Months Ended |  |
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Dec. 31, 2012 | Oct. 02, 2009 | Dec. 31, 2008 Dredge_cells Cubic_yards
Kingston Fossil Plant Ash Spill |  |  |
Number of dredge cells that failed |  |  | 1
Cubic yards of water and coal fly ash that flowed out of the cell |  |  | 5,000,000
Kingston cost estimate low end of range | $ 1,100,000,000 |  |
Kingston cost estimate high end of range | 1,200,000,000 |  |
Total recorded estimate of Kingston cleanup costs | 1,100,000,000 |  |
Period collected in rates |  | 15 years |
Kingston cleanup amounts spent to date | 881,000,000 |  |
Remaining estimated Kingston liability | 244,000,000 |  |
Kingston insurance proceeds | $ 45,000,000 |  |

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