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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) variable_interest_entities People | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
General and Basis of Presentation |  |  |  |  |
Population of TVA's service area | People | 9 |  |  |  |
Amount of appropriation investment that was repaid |  |  |  |  | $ 1,000
Number of variable interest entities | variable_interest_entities | 3 |  |  |  |
Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net |  | $ 12 |  |  |
Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net |  | (9) |  |  |
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 |
Loans receivable | 124 |  |  | 117 |
Loans receivable, allowance | 8 |  |  | $ 8 |
Depreciation expense | 364 | $ 380 |  |  |
Change in depreciation | 22 |  |  |  |
Total estimated amount of BLEU payments | 162 |  |  |  |
Payments attributable to BLEU fuel program | 131 |  |  |  |
BLEU fuel obligation | $ 12 |  |  |  |
Scenario, Forecast |  |  |  |  |
General and Basis of Presentation |  |  |  |  |
Change in depreciation |  |  | $ 83 |  |

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