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Summary of Significant Accounting Policies General and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended
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Jun. 30, 2014 variable_interest_entities People | Jun. 30, 2013 | Jun. 30, 2014 variable_interest_entities People | Jun. 30, 2013 | Sep. 30, 2013 | Jun. 30, 2014 Other Noncurrent Assets [Member] | Sep. 30, 2013 Other Noncurrent Assets [Member] | Sep. 30, 2014 Scenario, Forecast [Member]
General and Basis of Presentation |  |  |  |  |  |  |  |
Population of TVA's service area | 9,000,000 |  | 9,000,000 |  |  |  |  |
Number of variable interest entities | 3 |  | 3 |  |  |  |  |
Period of time for customers to fulfill payment arrangements |  |  | 90 days |  |  |  |  |
Allowance for uncollectible accounts, accounts receivable | $ 1 |  | $ 1 |  | $ 1 |  |  |
Loans and other long-term receivables, net | 96 |  | 96 |  | 67 | 105 | 73 |
Loans and other long-term receivables, allowance | 10 |  | 10 |  | 10 |  |  |
Depreciation expense | 391 | 341 | 1,100 | 1,000 |  |  |  |
Accelerated depreciation | 21 |  | 34 |  |  |  |  | 21
Total possible amount of payments | 160 |  | 160 |  |  |  |  |
Payments attributable to BLEU fuel program | 101 |  | 101 |  |  |  |  |
BLEU fuel obligation | $ 16 |  | $ 16 |  |  |  |  |

X
- Definition The liability established for payments due that are attributable to blended low-enriched uranium fuel that has been used. + References No definition available. + Details
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- Definition Number of variable interest entities in which TVA is the primary beneficiary. + References No definition available. + Details
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- Definition Payments attributable to blended low-enriched uranium fuel program + References No definition available. + Details
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- Definition The population of the company's service area. + References No definition available. + Details
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- Details
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- Definition Total of past and projected future payments that TVA may make to the DOE over the duration of the BLEU fuel program, from inception to termination. It includes the amounts paid out, plus an estimated amount related to possible future payments that may be payable to the DOE until the time that the BLEU fuel program ceases to be in effect. + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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