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Kingston Fossil Plant Ash Spill (Details) (USD $) | 0 Months Ended | 6 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Dec. 11, 2014 | Mar. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2008 Dredge_cells Cubic_yards
Kingston Fossil Plant Ash Spill |  |  |  |
Number of dredge cells that failed |  |  |  | 1 tve_NumberOfDredgeCellsThatFailed
Cubic yards of water and coal fly ash that flowed out of the cell |  |  |  | 5,000,000 tve_CubicYardsOfWaterAndCoalFlyAshThatFlowedOutOfCell
Total recorded estimate of Kingston cleanup costs |  | $ 1,100,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss | $ 1,100,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss |
Period collected in rates |  | 15 years |  |
Kingston cleanup amounts spent to date |  | 1,100,000,000 tve_KingstonAmountsSpentToDate | 1,100,000,000 tve_KingstonAmountsSpentToDate |
Remaining estimated Kingston liability |  | 23,000,000 us-gaap_AccrualForEnvironmentalLossContingencies | 23,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |
Kingston insurance recoveries | $ 50,000,000 us-gaap_InsuranceRecoveries |  | $ 317,000,000 us-gaap_InsuranceRecoveries |

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- Definition The amount of cubic yards of water and coal fly ash that flowed out of the cell. + References No definition available. + Details
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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 The number of dredge cells that failed. + 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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- 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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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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