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Kingston Fossil Plant Ash Spill Kingston Fossil Plant Ash Spill (Details) Cubic_yards in Millions, $ in Millions | 1 Months Ended | 12 Months Ended | 42 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2008 Dredge_cells Cubic_yards
Kingston Fossil Plant Ash Spill |  |  |  |
Number of dredge cells that failed | Dredge_cells |  |  |  | 1
Cubic yards of water and coal fly ash that flowed out of the cell | Cubic_yards |  |  |  | 5
Period collected in rates |  | 15 years |  |
Kingston cleanup amounts spent to date |  | $ 1,100 | $ 1,100 |
Remaining estimated Kingston liability |  | 6 | 6 |
Kingston insurance recoveries |  | $ 63 | $ 336 |
Scenario, Forecast [Member] |  |  |  |
Kingston Fossil Plant Ash Spill |  |  |  |
Kingston insurance recoveries | $ 7 |  |  |

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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 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: 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 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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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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