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Kingston Fossil Plant Ash Spill (Details) (USD $) | 3 Months Ended | 9 Months Ended | 27 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | 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 | $ 1,100,000,000 | $ 1,100,000,000 |
Kingston cost estimate high end of range | 1,200,000,000 | 1,200,000,000 | 1,200,000,000 |
Total recorded estimate of Kingston cleanup costs | 1,100,000,000 | 1,100,000,000 | 1,100,000,000 |
Period collected in rates |  | 15 years |  |
Kingston cleanup amounts spent to date | 1,000,000,000 | 1,000,000,000 | 1,000,000,000 |
Remaining estimated Kingston liability | 82,000,000 | 82,000,000 | 82,000,000 |
Kingston insurance recoveries | $ 14,000,000 | $ 175,000,000 | $ 267,000,000 |

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- Definition Amounts spent since the event through a certain date for the Kingston Ash Spill cleanup effort. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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