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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) variable_interest_entities People | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) variable_interest_entities People | Jun. 30, 2014 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 be repaid |  |  |  |  |  | $ 1,000
Number of variable interest entities | variable_interest_entities |  | 3 |  | 3 |  |
Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net |  |  |  | $ 51 |  |
Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net |  |  |  | (65) |  |
Reclassification to Other, net from Environmental cleanup costs-Kingston ash spill-non cash and Environmental cleanup costs-Kingston ash spill |  |  |  | $ (14) |  |
Period of time for customers to fulfill payment arrangements |  |  |  | 90 days |  |
Allowance for uncollectible accounts, accounts receivable |  | $ 1 |  | $ 1 |  | 1
Loans receivable |  | 99 |  | 99 |  | 81
Loans receivable, allowance |  | 9 |  | 9 |  | $ 9
Depreciation expense |  | 462 | $ 391 | 1,200 | $ 1,100 |
Accelerated depreciation |  | 81 |  | 81 |  |
Total possible amount of payments |  | 162 |  | 162 |  |
Payments attributable to BLEU fuel program |  | 131 |  | 131 |  |
BLEU fuel obligation |  | $ 12 |  | $ 12 |  |
Scenario, Forecast [Member] |  |  |  |  |  |
General and Basis of Presentation |  |  |  |  |  |
Accelerated depreciation | $ 137 |  |  |  |  |

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