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Summary of Significant Accounting Policies General and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 variable_interest_entities People | Sep. 30, 2012
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General and Basis of Presentation |  |
Population of TVA's service area | 9,000,000 |
Number of variable interest entities | 2 |
Period of time for customers to fulfill payment arrangements | 90 days |
Allowance for uncollectible accounts, accounts receivable | $ 4 | $ 7
Loans and other long-term receivables, net | 79 | 76
Loans and other long-term receivables, allowance | 11 | 12
Possible amount of future payments | 250 |
Estimated future payments attributable to BLEU fuel currently in use | $ 34 |

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- Definition The liability established for esitmated future payments attributable to blended low-enriched uranium fuel currently in use. + 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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