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Gallatin coal combustion residual facilities (Details) - USD ($) | 12 Months Ended |
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Sep. 30, 2018 | Sep. 30, 2017
Other Long-Term Liabilities |  |
Gallatin coal combustion residual facilities estimated cost to cap and close | $ 200,000,000 |
Gallatin coal combustion residual facilities original estimated cost for dewatering facility | 91,000,000 |
Gallatin coal combustion residual facilities estimated cost relocate offsite | 2,000,000,000 |
TDEC civil penalties related to Gallatin | 17,000 |
Plaintiff civil penalties related to Gallatin | 37,500 |
Gallatin coal combustion residual facilities estimated cost relocate onsite | 900,000,000 |
Other long-term liabilities |  |
Other Long-Term Liabilities |  |
Gallatin coal combustion residual facilities | 862,000,000 | $ 880,000,000
Accounts payable and accrued liabilities |  |
Other Long-Term Liabilities |  |
Gallatin coal combustion residual facilities | $ 30,000,000 |

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- Definition The amount per day the plaintiffs in the Gallatin Fossil Plant CCR cases are seeking for violations related to the TN Water Quality Control Act and TN Solid Waste Disposal Act. + References No definition available. + Details
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- Definition The amount per day TDEC is seeking for each day TVA is found to have violated the statutes related to the TN Water Quality Control Act and TN Solid Waste Disposal Act in relation to Gallatin Fossil Plant. + References No definition available. + Details
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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