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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) variable_interest_entities People | Mar. 31, 2015 USD ($) | Mar. 31, 2016 USD ($) variable_interest_entities People | Mar. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
General and Basis of Presentation |  |  |  |  |  |
Population of TVA's service area | People | 9 |  | 9 |  |  |
Amount of appropriation investment that was repaid |  |  |  |  |  | $ 1,000
Number of variable interest entities | variable_interest_entities | 3 |  | 3 |  |  |
Reclassification from Other Long-Term Assets to Long-Term Debt, Net |  |  |  |  | $ 80 |
Reclassification from Other Long-Term Assets to Long-term Power Bonds, Net |  |  |  |  | 67 |
Reclassification from Other Long-Term Assets to Long-Term Variable Interest Entities, Net |  |  |  |  | 13 |
Allowance for uncollectible accounts, accounts receivable | $ 1 |  | $ 1 |  | 1 |
Loans Receivable, Carrying Value | 144 |  | 144 |  | 117 |
Allowance for loans receivable | 8 |  | 8 |  | $ 8 |
Depreciation expense | 369 | $ 383 | 733 | $ 763 |  |
Change in depreciation | 21 |  | 43 |  |  |
Total estimated amount of BLEU payments | 165 |  | 165 |  |  |
Payments attributable to BLEU fuel program | 131 |  | 131 |  |  |
BLEU fuel obligation | $ 25 |  | $ 25 |  |  |

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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 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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