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Asset Retirement Obligations Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Asset Retirement Obligations |  |  |  |
Increase in ARO liability | $ (319) |  |  |
Initial decommissioning estimate for nuclear | 7 years |  |  |
ARO-Nuclear Decommissioning Study Update | 5 years |  |  |
Accretion expense | 40 |  |  |
Balance | 3,488 | [1] | 3,289 | [1]
Settlements (ash storage areas) | (14) | [1] | (37) | [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) | (472) | [1] |  |
Change in estimate | (10) | [1] | (66) | [1]
Accretion (recorded as regulatory asset) | 177 | [1] | 170 | [1]
Balance | 3,169 | [1] | 3,488 | [1]
Current portion of ARO | 80 |  |  |
Nuclear |  |  |  |
Asset Retirement Obligations |  |  |  |
Balance | 2,399 | [1] | 2,208 | [1]
Settlements (ash storage areas) | 0 | [1] | 0 | [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) | (472) | [1] |  |
Change in estimate | 0 | [1] | (66) | [1]
Accretion (recorded as regulatory asset) | 125 | [1] | 125 | [1]
Balance | 2,052 | [1] | 2,399 | [1]
Non-nuclear |  |  |  |
Asset Retirement Obligations |  |  |  |
Balance | 1,089 | [1] | 1,081 | [1]
Settlements (ash storage areas) | (14) | [1] | (37) | [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) | 0 | [1] |  |
Change in estimate | (10) | [1] | 0 | [1]
Accretion (recorded as regulatory asset) | 52 | [1] | 45 | [1]
Balance | $ 1,117 | [1] | $ 1,089 | [1]
[1] | The current portion of ARO in the amount of $80 million is included in Accounts payable and accrued liabilities.

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- Definition The amount of accretion recorded as a regulatory asset during the period. + References No definition available. + Details
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- Definition The maximum number of years in between ARO-nuclear decommissioning study updates. + References No definition available. + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation as a result of site-specific studies during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References No definition available. + Details
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- Definition The assumption for the amount of time after plant shut, prior to June 30, 2014, that TVA based its decommissioning cost estimates on cost elements prescribed by the Nuclear Regulatory Commission to dismantle and decommission the radioactive portion of each site , which approximates the DECON method of decommissioning. + References No definition available. + Details
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Net Increase or Decrease in the asset retirement obligation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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